CN103576292A - Imaging lens - Google Patents

Abstract

Provided is an imaging lens which comprises a first lens, a second lens, a third lens, a fourth lens and an imaging surface in turn from an object side to the imaging surface. The first lens comprises a first surface and a second surface in turn from the object side to an image side. The second lens comprises a third surface and a fourth surface. The third lens comprises a fifth surface and a sixth surface. The fourth lens comprises a seventh surface and an eighth surface. The imaging lens meets the following conditions: D/TTL>1.11; D/L>1.13; and Z/Y>0.076. D refers to diameter of the largest imaging circle on the imaging surface; TTL refers to length of the whole imaging lens; L refers to an effective diameter of a light emergent surface of the eighth surface; Z refers to different between the curved surface transverse height of the sixth surface and the central thickness of the third lens; and Y refers to the curved surface vertical height of the sixth surface. The imaging lens meeting the aforementioned conditions has imaging quality of being small in length, high in resolution and low in chromatic aberration.

Description

imaging lens

technical field

The invention relates to an imaging technology, in particular to an imaging lens.

Background technique

With the increasing popularity of smart phones, consumers are beginning to desire that, in addition to complete functions, the mobile phone should also be thin, light and small so that it can be easily carried. Therefore, the thinness and shortness of the mobile phone restricts the space for placing the camera module, and an imaging lens with "low length" and "small effective diameter of the light-emitting surface" is required to ensure that the total volume of the camera module can be minimized.

Most of the imaging lenses currently used in camera modules with more than 5 megapixels (5M) on mobile phones use an Auto Focus Actuator to drive the imaging lens to move, so that the photos taken are from the long-range end (infinity) to the close-up end (100mm) can be clear, this is because consumers hope that the mobile phone can take good landscape photos (long-range end), and can also take good portraits and headshots (medium-range end), and even can be used as business cards For identification (near view end, usually the distance for business card recognition is about 100mm), therefore, an imaging lens that "balances the quality of long and short view imaging" is required.

Contents of the invention

In view of this, it is necessary to provide an imaging lens with small length, high resolution and low chromatic aberration.

An imaging lens, which comprises sequentially from the object side to the imaging surface: a first lens, a second lens, a third lens, a fourth lens and an imaging surface, and the first lens sequentially images from the object side to the imaging surface. side includes a first surface and a second surface, the second lens sequentially includes a third surface and a fourth surface from the object side to the image side, and the third lens sequentially includes a fifth lens from the object side to the image side surface and a sixth surface, the fourth lens sequentially includes a seventh surface and an eighth surface from the object side to the image side, and the imaging lens satisfies the following conditions:

D/TTL>1.11; D/L>1.13; Z/Y>0.076;

Wherein, D is the diameter of the largest imaging circle on the imaging surface; TTL is the length of the entire imaging lens; L is the effective diameter of the light-emitting surface of the eighth surface; Z is the horizontal height of the curved surface of the sixth surface and the height of the third lens The difference between the center thicknesses, Y is the longitudinal height of the curved surface of the sixth surface.

The imaging lens satisfying the above conditions has the imaging quality of small length, high resolution and low chromatic aberration.

Description of drawings

FIG. 1 is a schematic structural diagram of an imaging lens provided by the present invention.

FIG. 2 is a characteristic curve diagram of spherical aberration of the imaging lens provided in the first embodiment of the present invention.

FIG. 3 is a graph of field curvature characteristics of the imaging lens provided in the first embodiment of the present invention.

FIG. 4 is a graph showing distortion characteristics of the imaging lens provided in the first embodiment of the present invention.

FIG. 5 is a characteristic curve diagram of the modulation transfer function of the imaging lens at the telephoto end provided by the first embodiment of the present invention.

FIG. 6 is a characteristic curve diagram of the spherical aberration at the close-range end of the imaging lens provided by the first embodiment of the present invention.

FIG. 7 is a characteristic curve diagram of spherical aberration of the imaging lens provided by the second embodiment of the present invention.

FIG. 8 is a graph of field curvature characteristics of the imaging lens provided in the second embodiment of the present invention.

FIG. 9 is a graph showing distortion characteristics of the imaging lens provided by the second embodiment of the present invention.

FIG. 10 is a characteristic curve diagram of the modulation transfer function of the imaging lens at the telephoto end according to the second embodiment of the present invention.

FIG. 11 is a characteristic curve diagram of the spherical aberration at the close-range end of the imaging lens provided by the second embodiment of the present invention.

FIG. 12 is a characteristic curve diagram of spherical aberration of the imaging lens provided by the third embodiment of the present invention.

FIG. 13 is a graph of field curvature characteristics of the imaging lens provided in the third embodiment of the present invention.

FIG. 14 is a graph showing distortion characteristics of the imaging lens provided by the third embodiment of the present invention.

FIG. 15 is a characteristic curve diagram of the modulation transfer function of the imaging lens at the telephoto end according to the third embodiment of the present invention.

FIG. 16 is a characteristic curve diagram of the spherical aberration at the close-range end of the imaging lens provided by the third embodiment of the present invention.

FIG. 17 is a characteristic curve diagram of spherical aberration of the imaging lens provided by the fourth embodiment of the present invention.

FIG. 18 is a field curvature characteristic curve diagram of the imaging lens provided by the fourth embodiment of the present invention.

FIG. 19 is a graph showing distortion characteristics of an imaging lens according to a fourth embodiment of the present invention.

FIG. 20 is a characteristic curve diagram of the modulation transfer function of the imaging lens at the telephoto end according to the fourth embodiment of the present invention.

FIG. 21 is a characteristic curve diagram of the spherical aberration at the close-range end of the imaging lens provided by the fourth embodiment of the present invention.

FIG. 22 is a characteristic curve diagram of spherical aberration of the imaging lens provided by the fifth embodiment of the present invention.

FIG. 23 is a graph of field curvature characteristics of the imaging lens provided in the fifth embodiment of the present invention.

FIG. 24 is a graph showing distortion characteristics of the imaging lens provided in the fifth embodiment of the present invention.

FIG. 25 is a characteristic curve diagram of the modulation transfer function of the imaging lens at the telephoto end according to the fifth embodiment of the present invention.

FIG. 26 is a characteristic curve diagram of the spherical aberration at the close-range end of the imaging lens provided by the fifth embodiment of the present invention.

FIG. 27 is a characteristic curve diagram of spherical aberration of the imaging lens provided by the sixth embodiment of the present invention.

FIG. 28 is a graph of field curvature characteristics of the imaging lens provided in the sixth embodiment of the present invention.

FIG. 29 is a graph showing distortion characteristics of the imaging lens provided in the sixth embodiment of the present invention.

FIG. 30 is a characteristic curve diagram of the modulation transfer function of the imaging lens at the telephoto end according to the sixth embodiment of the present invention.

FIG. 31 is a characteristic curve diagram of the spherical aberration at the close-range end of the imaging lens provided by the sixth embodiment of the present invention.

Description of main component symbols

imaging lens 100 aperture 10 first lens L1 second lens L2 third lens L3 fourth lens L4 first surface S1 second surface S2 third surface S3 fourth surface S4 fifth surface S5 sixth surface S6 seventh surface S7 eighth surface S8 ninth surface S9 tenth surface S10 filter 20 imaging surface 30

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 1 , an imaging lens 100 provided by the present invention, which includes in sequence from the object side to the imaging surface: a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens L2 with negative refractive power. A third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a filter 20 and an imaging surface 30 .

The first lens L1 is a biconvex lens, which sequentially includes a first surface S1 protruding toward the object side and a second surface S2 protruding toward the imaging surface 30 from the object side to the image side.

The second lens L2 is a crescent lens, which sequentially includes a third surface S3 protruding toward the object side and a fourth surface S4 concave toward the inside of the second lens L2 from the object side to the image side.

The third lens L3 is a crescent lens, and includes a fifth surface S5 concave toward the third lens L3 and a sixth surface S6 convex toward the imaging plane 30 from the object side to the image side.

The fourth lens L4 sequentially includes a seventh surface S7 concave toward the inside of the fourth lens L4 and an eighth surface S8 convex toward the imaging plane 30 from the object side to the image side. In this embodiment, the seventh surface S7 protrudes toward the object side near the optical axis X, and the eighth surface S8 is concave toward the inside of the fourth lens L4 near the optical axis X.

The filter 20 sequentially includes a ninth surface S19 close to the object side and a tenth surface S10 close to the imaging surface 30 from the object side to the image side. The filter 20 is used for filtering infrared rays in the rays passing through the fourth lens L4.

The imaging lens 100 also includes an aperture 10 . The diaphragm 10 is located between the object side and the first lens L1 to ensure that the overall structure of the imaging lens 100 is symmetrical with respect to the diaphragm 10, effectively reducing the influence of coma (coma); while limiting the light passing through the object The light flux entering the first lens L1 makes the light cone after passing through the first lens L1 more symmetrical, so that the coma aberration of the imaging lens 100 can be corrected.

In this embodiment, after the light enters the diaphragm 10 from the object side, and passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the filter 20 in sequence The image is formed on the imaging surface 30 . It can be understood that an image sensor (not shown), such as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS), can be arranged on the imaging surface 30 to form an imaging system.

The imaging lens 100 satisfies the following conditional formula:

(1) D/TTL>1.11;

Wherein, D is the diameter of the largest imaging circle on the imaging surface 30 ; TTL is the length of the entire imaging lens 100 .

In the conditional formula of the imaging lens 100 provided by the present invention, the conditional formula (1) limits the total length of the imaging lens 100 .

The imaging lens 100 may further satisfy the following conditional formula:

(2) D/L>1.13;

Wherein L is the effective diameter of the light emitting surface of the eighth surface S8.

The conditional formula (2) limits the effective diameter of the light exit surface of the imaging lens 100 so that the total diameter of the imaging lens 100 can be smaller than the maximum imaging circle diameter and reach the minimum.

The imaging lens 100 may further satisfy the following conditional formula:

(3) Z/Y>0.076;

Wherein, Z is the difference between the lateral height of the curved surface of the sixth surface S6 and the central thickness of the third lens L3, and Y is the longitudinal height of the curved surface of the sixth surface S6.

The conditional formula (3) ensures that the fourth lens L4 is easy to be injection molded, so that the plastic injected from a single side gate can easily reach the opposite side, thereby reducing the eccentricity sensitivity of the imaging lens 100 .

The imaging lens 100 may further satisfy the following conditional formula:

(4) 0<|R32/F3|<|R42/F4|<|R11/F1|;

Wherein, R11 is the radius of curvature of the first surface S1 of the first lens L1; R32 is the radius of curvature of the sixth surface S6 of the third lens L3; R42 is the radius of curvature of the eighth surface S8 of the fourth lens L4 Radius of curvature; F1 is the focal length of the first lens L1; F3 is the focal length of the third lens L3; F4 is the focal length of the fourth lens L4.

The conditional formula (4) makes the imaging lens 100 have a good aberration correction effect.

The imaging lens 100 may further satisfy the following conditional formula:

(5) |R41/F4 |>|R42/F4|>0;

Wherein, R41 is the radius of curvature of the seventh surface S7 of the fourth lens L4.

The conditional expression (5) makes the off-center sensitivity of the imaging lens 100 smaller.

In order to further ensure the imaging quality of the imaging lens 100 under the above-mentioned limiting conditions, the first lens L1 also needs to meet the following conditions: 0<R11/F1<0.968, -2.287<R12/F1<0; the second lens L2 pieces Also need to meet the following conditions:-4.074<R21/F2<0,-0.648<R22/F2<0; the third lens L3 also needs to meet the following conditions:-7.128<R31/F3<0,-0.615<R32/ F3<0; the fourth lens L4 also needs to meet the following conditions: -26.831 < R41/F4 <14.325, -0.695 < R42/F4<0.

Wherein, R12 is the radius of curvature of the second surface S2 of the first lens L1; R21 is the radius of curvature of the third surface S3 of the second lens L2; R22 is the radius of curvature of the fourth surface S4 of the second lens L2 Radius of curvature; F2 is the focal length of the second lens L2; R31 is the radius of curvature of the fifth surface S5 of the third lens L3; F3 is the focal length of the third lens L3.

In order to better eliminate the chromatic aberration of the imaging lens 100, the imaging lens 100 also needs to meet the following conditions:

Vd1>53, Vd3>53, Vd4>53, and Vd2<33.

Wherein, Vd1 is the Abbe number of the first lens L1; Vd2 is the Abbe number of the second lens L2; Vd3 is the Abbe number of the third lens L3; Vd4 is the Abbe number of the fourth lens L4. Abbe number.

Wherein, the first surface S1, the second surface S2, the third surface S3, the fourth surface S4, the fifth surface S5, the sixth surface S6, the seventh surface S7, and the eighth surface S8 are all aspherical surfaces, and satisfy an The surface type formula of a sphere:

Among them, z is the displacement value from the optical axis at the position of height h along the direction of the optical axis, c is the radius of curvature, h is the height of the lens, K is the cone constant (Coin Constant), and Ai is the number i Aspherical Coefficient (i-th order Aspherical Coefficient).

By substituting the information in Tables 1-4 (please refer to the following) into the above expression, the aspheric shape of each lens surface in the imaging lens 100 according to the first embodiment of the present invention can be obtained. By substituting the data in Tables 5-8 into the above expressions, the aspherical shape of each lens surface in the imaging lens 100 according to the second embodiment of the present invention can be known. By substituting the information in Tables 9-12 into the above expressions, the aspheric shape of each lens surface in the imaging lens 100 according to the third embodiment of the present invention can be known. By substituting the information in Tables 13-16 into the above expressions, the aspheric shape of each lens surface in the imaging lens 100 according to the fourth embodiment of the present invention can be known. By substituting the information in Tables 17-20 into the above expressions, the aspherical shape of each lens surface in the imaging lens 100 according to the fifth embodiment of the present invention can be known. By substituting the data in Tables 21-24 into the above expressions, the aspherical shape of each lens surface in the imaging lens 100 according to the sixth embodiment of the present invention can be known.

The following tables list the optical surfaces arranged sequentially from the object end to the image end, where i represents the i-th lens surface from the object side; the conventional F/No is the aperture number of the imaging lens 100; 2ω is the imaging The angle of view of the lens 100; ri represents the radius of curvature of the i-th lens surface starting from the object side; Di represents the axial distance between the i-th lens surface and the i+1-th lens surface starting from the object side; ni Represents the refractive index of the i-th lens surface from the object side; vi represents the Abbe number of the i-th lens surface from the object side; ki represents the quadratic curvature of the i-th lens surface from the object side.

first embodiment

Each optical component of the imaging lens 100 provided by the first embodiment of the present invention satisfies the conditions in Tables 1 to 4.

Table 1

optical surface face shape ri(mm) Di(mm) ni vi the ki Aperture 10 flat gigantic -0.02 -- -- -- first surface S1 Aspherical 1.53 0.57 1.54 56.1 -0.95 Second surface S2 Aspherical -4.80 0.03 -- -- -- third surface S3 Aspherical 11.09 0.27 1.64 23.9 -- Fourth Surface S4 Aspherical 1.76 0.52 -- -- -11.49 Fifth Surface S5 Aspherical -6.35 0.71 1.53 56 30.92 Sixth Surface S6 Aspherical -0.93 0.33 -- -- -6.11 Seventh Surface S7 Aspherical -26.15 0.30 1.53 56.0 -- Eighth Surface S8 Aspherical 1.03 0.30 -- -- -6.99 Ninth Surface S9 Aspherical gigantic 0.21 1.52 54.5 -- Tenth Surface S10 Aspherical gigantic 0.51 -- -- -- Imaging surface 30 flat -- -- -- -- --

Table 2

Aspheric coefficient first surface S1 Second surface S2 third surface S3 Fourth Surface S4 A4 1.3E-03 0.0358 -0.0108 0.2471 A6 0.1068 -0.0645 -0.0946 -0.4233 A8 -0.4539 0.3216 0.5746 0.7730 A10 0.5299 -0.6578 -0.5004 -0.4420 A12 -0.2224 0.2207 -0.0885 -0.0180

table 3

Aspheric coefficient Fifth Surface S5 Sixth Surface S6 Seventh Surface S7 Eighth Surface S8 A4 0.0888 -0.3054 -0.1530 -0.1338 A6 -0.0869 0.6127 -9.0E-03 0.0436 A8 0.0332 -0.7825 0.0374 -0.0108 A10 0.0601 0.5434 -7.3E-03 1.4E-03 A12 -0.0259 -0.1360 -5.9E-05 -1.2E-04

Table 4

F(mm) F/No 2ω 3.04 2.38 73.47°

In this embodiment, D=4.544mm; TTL=3.752mm; Z=0.395mm; Y=3.684mm; L=1.210mm; F1=2.193mm; F2=-3.308; F3=1.943mm; F4=-1.838mm .

The spherical aberration, curvature of field, and distortion of the imaging lens 100 of the first embodiment are respectively shown in FIGS. 2 to 4 . Specifically, the six curves shown in Figure 2 are for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm) , g line (wavelength of 435.8nm), h line (wavelength of 404.7nm) and the observed aberration value curve. It can be seen from the six curves that the aberration value generated by the imaging lens 100 of the first embodiment to visible light (with a wavelength range between 400nm and 700nm) is controlled within the range of -0.10mm~0.10mm. As shown in Fig. 3, the curves T and S are characteristic curves of tangential field curvature and characteristic curves of sagittal field curvature respectively. It can be seen from FIG. 3 that the meridian field curvature and sagittal field curvature of the imaging lens 100 are controlled within the range of -0.20mm~0.20mm. Further, the curve shown in FIG. 4 is the distortion characteristic curve of the imaging lens 100, and it can be known from FIG. 4 that the optical distortion of the imaging lens 100 is controlled within the range of -3.00%~3.00%.

At the far view end, the MTF is shown in Figure 5. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 179lp/mm), the MTF of the central field of view> 59% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 59%. (as shown by the curve mt).

At the close-range end, the MTF is shown in Figure 6. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 179 lp/mm), the MTF of the central field of view>50% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the rest of the field of view between the central field of view and the 0.8 field of view is between 40% and 50%. (as shown by the curve mt).

second embodiment

Each optical component of the imaging lens 100 provided by the second embodiment of the present invention satisfies the conditions in Table 5 to Table 8 .

table 5

optical surface face shape ri(mm) Di(mm) ni vi the ki Aperture 10 flat gigantic 0.03 -- -- -- first surface S1 Aspherical 1.60 0.49 1.54 56.1 -0.87 Second surface S2 Aspherical -4.50 0.03 -- -- -- third surface S3 Aspherical 13.49 0.25 1.64 23.9 -- Fourth surface S4 Aspherical 1.86 0.65 -- -- -11.62 Fifth Surface S5 Aspherical -4.06 0.58 1.53 56.0 5.94 Sixth Surface S6 Aspherical -0.90 0.38 -- -- -5.36 Seventh Surface S7 Aspherical 50.04 0.30 1.53 56.0 -- Eighth Surface S8 Aspherical 0.98 0.30 -- -- -6.19 Ninth Surface S9 Aspherical gigantic 0.21 1.52 54.5 -- Tenth Surface S10 Aspherical gigantic 0.57 -- -- -- Imaging surface 30 flat -- -- -- -- --

Table 6

Aspheric coefficient first surface S1 Second surface S2 third surface S3 Fourth Surface S4 A4 -4.2E-03 0.0389 0.0229 0.2208 A6 0.0524 0.0685 -0.0899 -0.4378 A8 -0.3847 0.0711 0.5673 0.8363 A10 0.4464 -1.0528 -0.5307 -0.4232 A12 -0.1836 0.7940 -0.1807 -0.1155

Table 7

Aspheric coefficient Fifth Surface S5 Sixth Surface S6 Seventh Surface S7 Eighth Surface S8 A4 0.1218 -0.2723 -0.1083 -0.1143 A6 -0.1054 0.6102 -0.0186 0.0344 A8 0.0362 -0.7755 0.0310 -8.2E-03 A10 0.0506 0.5402 -6.6E-03 1.0E-03 A12 -0.0267 -0.1371 3.0E-04 -7.6E-05

Table 8

F(mm) F/No 2ω 3.11 2.77 72.77°

In this embodiment, D=4.544mm; TTL=3.785mm; Z=0.360mm; Y=2.047mm; L=3.788mm; F1=2.218mm; F2=-3.394; F3=2.014mm; F4=-1.872mm .

The spherical aberration, curvature of field, and distortion of the imaging lens 100 of the second embodiment are respectively shown in FIGS. 7 to 9 . Specifically, the six curves shown in Figure 7 are for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm) , g line (wavelength of 435.8nm), h line (wavelength of 404.7nm) and the observed aberration value curve. It can be seen from the six curves that the aberration value generated by the imaging lens 100 of the second embodiment for visible light (with a wavelength range between 400nm and 700nm) is controlled within the range of -0.10mm~0.10mm. As shown in FIG. 8 , curves T and S are characteristic curves of tangential field curvature and characteristic curves of sagittal field curvature respectively. It can be seen from FIG. 8 that the meridional field curvature and sagittal field curvature of the imaging lens 100 are controlled within the range of -0.20mm~0.20mm. Further, the curve shown in FIG. 9 is the distortion characteristic curve of the imaging lens 100. It can be seen from FIG. 9 that the optical distortion of the imaging lens 100 is controlled within the range of -3.00%~3.00%.

At the far view end, the MTF is shown in Figure 10. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 179lp/mm), the MTF of the central field of view> 59% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 59%. (as shown by the curve mt).

At the close-range end, the MTF is shown in Figure 11. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 179 lp/mm), the MTF of the central field of view>50% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the rest of the field of view between the central field of view and the 0.8 field of view is between 40% and 50%. (as shown by the curve mt).

third embodiment

Each optical component of the imaging lens 100 provided by the third embodiment of the present invention satisfies the conditions in Tables 9 to 12.

Table 9

optical surface face shape ri(mm) Di(mm) ni vi the ki Aperture 10 flat gigantic 0.03 -- -- -- first surface S1 Aspherical 1.74 0.63 1.54 56.1 0.0679 Second surface S2 Aspherical -2.94 0.03 -- -- 2.4942 third surface S3 Aspherical 9.89 0.32 1.64 23.9 -363.1415 Fourth surface S4 Aspherical 1.89 0.49 -- -- -1.0947 Fifth Surface S5 Aspherical -1.74 0.60 1.53 56.0 -28.1603 Sixth Surface S6 Aspherical -0.71 0.05 -- -- -3.5387 Seventh Surface S7 Aspherical 3.50 0.52 1.53 56.0 0.3002 Eighth Surface S8 Aspherical 0.74 0.39 -- -- -5.8045 Ninth Surface S9 Aspherical gigantic 0.21 1.52 58.6 -- Tenth Surface S10 Aspherical gigantic 0.47 -- -- -- Imaging surface 30 flat -- -- -- -- --

Table 10

Aspheric coefficient first surface S1 Second surface S2 third surface S3 Fourth Surface S4 A4 -0.1085 -0.3580 -0.3299 -0.0466 A6 0.3749 0.6052 0.4364 -0.0161 A8 -2.4247 -0.3525 0.6292 -0.0159 A10 4.9820 0.1369 -0.9918 0.9928 A12 -2.8771 -0.3413 -0.0470 -1.6038 A14 -2.2221 -0.4302 0.1790 0.7767

Table 11

Aspheric coefficient Fifth Surface S5 Sixth Surface S6 Seventh Surface S7 Eighth Surface S8 A4 -0.3391 -0.3023 -0.3881 -0.2043 A6 0.3360 0.2264 0.2783 0.1462 A8 -0.1645 -0.1354 -0.0851 -0.0873 A10 -0.1091 0.0979 -5.3E-03 0.0328 A12 0.4091 0.1311 5.2E-03 -7.3E-03 A14 -0.2294 -0.0952 1.0E-04 6.9E-04

Table 12

F(mm) F/No 2ω 2.81 2.40 65.99°

In this embodiment, D=3.636mm; TTL=3.743mm; Z=0.482mm; Y=1.617mm; L=3.035mm; F1=2.103mm; F2=-3.694; F3=1.860mm; F4=-1.874mm .

The spherical aberration, curvature of field, and distortion of the imaging lens 100 of the third embodiment are respectively shown in FIGS. 12 to 14 . Specifically, the six curves shown in Figure 12 are for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm) , g line (wavelength of 435.8nm), h line (wavelength of 404.7nm) and the observed aberration value curve. It can be seen from the six curves that the aberration value generated by the imaging lens 100 of the third embodiment to visible light (with a wavelength range between 400nm and 700nm) is controlled within the range of -0.10mm~0.10mm. As shown in FIG. 13 , curves T and S are characteristic curves of tangential field curvature and characteristic curves of sagittal field curvature respectively. It can be seen from FIG. 13 that the meridional field curvature and sagittal field curvature of the imaging lens 100 are controlled within the range of -0.20mm~0.20mm. Further, the curve shown in FIG. 14 is the distortion characteristic curve of the imaging lens 100. It can be seen from FIG. 14 that the optical distortion of the imaging lens 100 is controlled within the range of -3.00%~3.00%.

At the far view end, the MTF is shown in Figure 15. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 223lp/mm), the MTF of the central field of view> 59% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 59%. (as shown by the curve mt).

At the close-range end, the MTF is shown in Figure 16. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 223 lp/mm), the MTF of the central field of view>50% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the rest of the field of view between the central field of view and the 0.8 field of view is between 40% and 50%. (as shown by the curve mt).

Fourth Embodiment

Each optical component of the imaging lens 100 provided by the fourth embodiment of the present invention satisfies the conditions in Table 13 to Table 16.

Table 13

optical surface face shape ri(mm) Di(mm) ni vi the ki Aperture 10 flat gigantic -2.0E-03 -- -- -- first surface S1 Aspherical 1.74 0.63 1.54 56.1 0.07 Second surface S2 Aspherical -2.94 0.03 -- -- 2.49 third surface S3 Aspherical 9.89 0.32 1.64 23.9 -363.04 Fourth Surface S4 Aspherical 1.89 0.49 -- -- -1.10 Fifth Surface S5 Aspherical -1.74 0.60 1.53 56.0 -28.15 Sixth Surface S6 Aspherical -0.71 0.05 -- -- -3.54 Seventh Surface S7 Aspherical 3.50 0.52 1.53 56.0 0.31 Eighth Surface S8 Aspherical 0.74 0.39 -- -- -5.80 Ninth Surface S9 Aspherical gigantic 0.21 1.52 54.5 -- Tenth Surface S10 Aspherical gigantic 0.47 -- -- -- Imaging surface 30 flat -- -- -- -- --

Table 14

Aspheric coefficient first surface S1 Second surface S2 third surface S3 Fourth surface S4 A4 -0.1085 -0.3580 -0.3299 -0.0466 A6 0.3747 0.6052 0.4364 -0.0161 A8 -2.4250 -0.3525 0.6291 -0.0157 A10 4.9820 0.1365 -0.9920 0.9932 A12 -2.8732 -0.3434 -0.0469 -1.6029 A14 -2.1950 -0.4379 0.1802 0.7785

Table 15

Aspheric coefficient Fifth Surface S5 Sixth Surface S6 Seventh Surface S7 Eighth Surface S8 A4 -0.3391 -0.3023 -0.3881 -0.2041 A6 0.3360 0.2264 0.2783 0.1461 A8 -0.1645 -0.1354 -0.0851 -0.0873 A10 -0.1092 0.0979 -5.3E-03 0.0328 A12 0.4089 0.1311 5.2E-03 -7.3E-03 A14 -0.2298 -0.0952 1.0E-04 6.8E-04

Table 16

F(mm) F/No 2ω 2.81 2.40 65.97°

In this embodiment, D=3.636mm; TTL=3.714mm; Z=0.480mm; Y=1.614mm; L=3.028mm; F1=2.103mm; F2=-3.694; F3=1.860mm; F4=-1.874mm .

The spherical aberration, curvature of field, and distortion of the imaging lens 100 of the fourth embodiment are shown in FIGS. 17 to 19 , respectively. Specifically, the six curves shown in Figure 17 are for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm) , g line (wavelength of 435.8nm), h line (wavelength of 404.7nm) and the observed aberration value curve. It can be seen from the six curves that the aberration value generated by the imaging lens 100 of the fourth embodiment for visible light (with a wavelength range between 400nm and 700nm) is controlled within the range of -0.10mm~0.10mm. As shown in FIG. 18 , curves T and S are characteristic curves of tangential field curvature and characteristic curves of sagittal field curvature respectively. It can be seen from FIG. 18 that the meridian field curvature and sagittal field curvature of the imaging lens 100 are controlled within the range of -0.20mm~0.20mm. Further, the curve shown in FIG. 19 is the distortion characteristic curve of the imaging lens 100. It can be seen from FIG. 19 that the optical distortion of the imaging lens 100 is controlled within the range of -3.00%~3.00%.

At the far view end, the MTF is shown in Figure 20. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) in this embodiment is 223lp/mm), the MTF of the central field of view> 59% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 59%. (as shown by the curve mt).

At the close-range end, the MTF is shown in Figure 21. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) in this embodiment is 223 lp/mm), the MTF of the central field of view>50% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the rest of the field of view between the central field of view and the 0.8 field of view is between 40% and 50%. (as shown by the curve mt).

Fifth Embodiment

Each optical component of the imaging lens 100 provided by the fifth embodiment of the present invention satisfies the conditions in Table 17 to Table 20.

Table 17

optical surface face shape ri(mm) Di(mm) ni vi the ki Aperture 10 flat gigantic 0.03 -- -- -- first surface S1 Aspherical 1.89 0.63 1.54 56.1 -1.70 Second surface S2 Aspherical -2.84 0.03 -- -- -- third surface S3 Aspherical 10.06 0.28 1.64 23.9 -- Fourth Surface S4 Aspherical 1.74 0.50 -- -- -12.63 Fifth Surface S5 Aspherical -3.80 0.71 1.53 56.0 9.55 Sixth Surface S6 Aspherical -0.80 0.25 -- -- -4.97 Seventh Surface S7 Aspherical 9.53 0.35 1.53 56.0 -- Eighth Surface S8 Aspherical 0.82 0.30 -- -- -5.67 Ninth Surface S9 Aspherical Infinity 0.21 1.52 58.6 -- Tenth Surface S10 Aspherical Infinity 0.57 -- -- -- Imaging surface 30 flat -- -- -- -- --

Table 18

Aspheric coefficient first surface S1 Second surface S2 third surface S3 Fourth surface S4 A4 -0.0213 -2.5E-03 -0.0472 0.2265 A6 0.0267 -0.0567 -0.0880 -0.4545 A8 -0.3549 0.1687 0.5560 0.7372 A10 0.4778 -0.3725 -0.5416 -0.4416 A12 -0.3586 0.0520 0.0535 0.0365

Table 19

Aspheric coefficient Fifth Surface S5 Sixth Surface S6 Seventh Surface S7 Eighth Surface S8 A4 0.1350 -0.2805 -0.1086 -0.1042 A6 -0.1109 0.6024 -0.0240 0.0319 A8 0.0526 -0.7767 0.0316 -8.1E-03 A10 0.0628 0.5443 -5.7E-03 9.5E-04 A12 -0.0333 -0.1372 5.0E-05 -4.6E-05

Table 20

F(mm) F/No 2ω 2.96 2.39 75.26°

In this embodiment, D=4.544mm; TTL=3.859mm; Z=0.410mm; Y=2.039mm; L=3.826mm; F1=2.182mm; F2=-3.326; F3=1.750mm; F4=-1.694mm .

The spherical aberration, curvature of field, and distortion of the imaging lens 100 of the fifth embodiment are shown in FIGS. 22 to 24 respectively. Specifically, the six curves shown in Figure 22 are for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm) , g line (wavelength of 435.8nm), h line (wavelength of 404.7nm) and the observed aberration value curve. It can be seen from the six curves that the aberration value generated by the imaging lens 100 of the fifth embodiment to visible light (with a wavelength range between 400nm and 700nm) is controlled within the range of -0.10mm~0.10mm. As shown in FIG. 23 , curves T and S are characteristic curves of meridional field curvature and sagittal field curvature respectively. It can be seen from FIG. 23 that the meridional field curvature and sagittal field curvature of the imaging lens 100 are controlled within the range of -0.20mm~0.20mm. Further, the curve shown in FIG. 24 is the distortion characteristic curve of the imaging lens 100. It can be seen from FIG. 24 that the optical distortion of the imaging lens 100 is controlled within the range of -3.00%~3.00%.

At the far view end, the MTF is shown in Figure 25. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) in this embodiment is 179 lp/mm), the MTF of the central field of view>59% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 59%. (as shown by the curve mt).

At the close-range end, the MTF is shown in Figure 26. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 179 lp/mm), the MTF of the central field of view>50% ( As shown in the curve mc), the MTF of the 0.8 field of view is > 40% (as shown in the curve mp), and the MTF of the rest of the field of view between the central field of view and the 0.8 field of view is between 40% and 50%. (as shown by the curve mt).

Sixth Embodiment

Each optical component of the imaging lens 100 provided by the sixth embodiment of the present invention satisfies the conditions in Table 21 to Table 24.

Table 21

optical surface face shape ri(mm) Di(mm) ni vi the ki Aperture 10 flat gigantic -0.05 -- -- -- first surface S1 Aspherical 1.85 0.71 1.54 56.1 1.09 Second surface S2 Aspherical -3.14 0.03 -- -- -13.69 third surface S3 Aspherical 9.25 0.28 1.64 23.9 -- Fourth Surface S4 Aspherical 1.73 0.43 -- -- -0.19 Fifth Surface S5 Aspherical -10.93 1.03 1.53 56.0 -642.02 Sixth Surface S6 Aspherical -0.81 0.16 -- -- -4.58 Seventh Surface S7 Aspherical -9.15 0.35 1.53 56.0 -- Eighth Surface S8 Aspherical 0.86 0.35 -- -- -6.65 Ninth Surface S9 Aspherical gigantic 0.21 1.52 54.5 -- Tenth Surface S10 Aspherical gigantic 0.60 -- -- -- Imaging surface 30 flat -- -- -- -- --

Table 22

Aspheric coefficient first surface S1 Second surface S2 third surface S3 Fourth surface S4 A4 -0.0555 -0.0263 -0.0719 -0.1018 A6 0.0526 -0.0201 0.0528 0.0940 A8 -0.4577 0.0217 0.0700 0.0146 A10 0.9994 -0.1103 0.0787 0.0624 A12 -1.2025 0.2622 -0.1694 -0.1214 A14 0.5640 -0.2614 0.0160 0.0371

Table 23

Aspheric coefficient Fifth Surface S5 Sixth Surface S6 Seventh Surface S7 Eighth Surface S8 A4 -0.0202 -0.1677 -0.2145 -0.1744 A6 0.0284 0.1467 1.4E-03 0.0934 A8 2.6E-03 -0.0878 0.0609 -0.0397 A10 -4.7E-03 0.0316 -0.0148 0.0110 A12 0.0433 0.0184 -6.5E-03 -1.9E-03 A14 -0.0332 -0.0106 1.5E-04 1.2E-04

Table 24

F(mm) F/No 2ω 3.23 2.39 70.13°

In this embodiment, D=4.544mm; TTL=4.142mm; Z=0.511mm; Y=1.906mm; L=3.512mm; F1=2.242mm; F2=-3.372; F3=1.577mm; F4=-1.445mm .

The spherical aberration, curvature of field, and distortion of the imaging lens 100 of the sixth embodiment are shown in FIGS. 27 to 29 , respectively. Specifically, the six curves shown in Figure 27 are for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm) , g-line (wavelength of 435.8nm), h-line (wavelength of 404.7nm) and the observed aberration curve. It can be seen from the six curves that the aberration value generated by the imaging lens 100 of the sixth embodiment for visible light (with a wavelength range between 400nm and 700nm) is controlled within the range of -0.10mm~0.10mm. As shown in FIG. 28 , curves T and S are characteristic curves of tangential field curvature and characteristic curves of sagittal field curvature respectively. It can be seen from FIG. 28 that the meridian field curvature and sagittal field curvature of the imaging lens 100 are controlled within the range of -0.20mm~0.20mm. Further, the curve shown in FIG. 29 is the distortion characteristic curve of the imaging lens 100. It can be seen from FIG. 29 that the optical distortion of the imaging lens 100 is controlled within the range of -3.00%~3.00%.

At the far view end, the MTF is shown in Figure 30. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) in this embodiment is 179 lp/mm), the MTF of the central field of view>59% ( As shown by the curve mc), the MTF of the 0.8 field of view is > 40% (as shown by the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 59%. (as shown by the curve mt).

At the close-range end, the MTF is shown in Figure 31. Under the condition of 1/2 frequency (Nyquist frequency) (the 1/2 frequency (half frequency) of this embodiment is 179 lp/mm), the MTF of the central field of view> 50% ( As shown by the curve mc), the MTF of the 0.8 field of view is >40% (as shown by the curve mp), and the MTF of the other fields between the central field of view and the 0.8 field of view is between 40% and 50%. (as shown by the curve mt).

The imaging lens satisfying the above conditions has the imaging quality of small length, high resolution and low chromatic aberration.

In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made according to the spirit of the present invention should be included within the scope of protection claimed by the present invention.

Claims (9)

1. an imaging lens, it comprises to imaging surface successively from thing side: a first lens, one second lens, one the 3rd lens, one the 4th lens and an imaging surface, described first lens is from thing side to comprising a first surface and second surface as side successively, described the second lens are from thing side to comprise successively one the 3rd surface and one the 4th surface as side, described the 3rd lens are from thing side to comprise successively one the 5th surface and one the 6th surface as side, described the 4th lens are from thing side to comprise successively one the 7th surface and one the 8th surface as side, and described imaging lens meets the following conditions:

D/TTL>1.11；D/L>1.13；Z/Y>0.076；

Wherein, D is maximum imaging circular diameter on imaging surface; TTL is the length of whole imaging lens; L is the effective diameter of the exiting surface on the 8th surface; Z is the poor of the curved surface transverse height on described the 6th surface and the center thickness of described the 3rd lens, and Y is the longitudinal height of the curved surface on described the 6th surface.

2. imaging lens as claimed in claim 1, is characterized in that: described first lens has positive light coke, and described the second lens have negative power, and described the 3rd lens have positive light coke, and described the 4th lens have negative power.

3. imaging lens as claimed in claim 1, it is characterized in that: described first lens is lenticular lens, described first surface protrudes towards thing side, described second surface protrudes to described imaging surface, described the second lens are crescent lens, protrude towards object one side on described the 3rd surface, described the 4th surface is to described the second lens inner recess, described the 3rd lens are crescent lens, described the 5th surface is to the 3rd lens inner recess, protrude to described imaging surface one side on described the 6th surface, protrude to thing side near near the system optical axis of described imaging device on described the 7th surface, described the 8th surface near near the optical axis of described imaging device to the 4th lens inner recess.

4. imaging lens as claimed in claim 3, is characterized in that: described imaging lens also meets: 0<|R32/F3|<|R42/F4|LEssT.LTssT .LT|R11/F1|; The radius-of-curvature of the first surface that wherein, R11 is described first lens; R32 is the radius-of-curvature on the 6th surface of described the 3rd lens; R42 is the radius-of-curvature on the 8th surface of described the 4th lens; F1 is the focal length of described first lens; F3 is the focal length of described the 3rd lens; F4 is the focal length of described the 4th lens.

5. imaging lens as claimed in claim 4, is characterized in that: described imaging lens also meets: | R41/F4 | >|R42/F4|>0; Wherein, R41 is the radius-of-curvature on the 7th surface of described the 4th lens.

6. imaging lens as claimed in claim 3, it is characterized in that: described imaging lens also meets: described first lens also needs to meet the following conditions: 0<R11/F1<0.968 ,-2.287 < R12/F1 <0; Described the second lens also need to meet the following conditions :-4.074<R21/F2<0 ,-0.648<R22/F2<0; Described the 3rd lens also need to meet the following conditions :-7.128<R31/F3<0 ,-0.615<R32/F3<0; Described the 4th lens also need to meet the following conditions :-26.831 < R41/F4 <14.325, and-0.695 < R42/F4<0, wherein, the radius-of-curvature that R12 is described second surface; R21 is the radius-of-curvature on described the 3rd surface; R22 is the radius-of-curvature on described the 4th surface; F2 is the focal length of described the second lens; R31 is the radius-of-curvature on described the 5th surface; F3 is the focal length of described the 3rd lens.

7. imaging lens as claimed in claim 3, it is characterized in that: described imaging lens also needs to meet the following conditions: Vd1>53, Vd3>53, Vd4>53 and Vd2<33, wherein, the Abbe number that Vd1 is described first lens; Vd2 is the Abbe number of described the second lens; Vd3 is the Abbe number of described the 3rd lens; Vd4 is the Abbe number of described the 4th lens.

8. imaging lens as claimed in claim 1, is characterized in that: described imaging lens also comprises a diaphragm, and described diaphragm is arranged between thing side and described first lens.

9. imaging lens as claimed in claim 1, is characterized in that: described imaging lens also comprises an optical filter, and described optical filter is between described the 4th lens and imaging surface.

Images