Camera optical lens

The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of glass material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority benefit of Chinese Patent Applications Ser. No. 201711475783.9 and Ser. No. 201711476379.3 filed on Dec. 29, 2017, the entire content of which is incorporated herein by reference.

FIELD OF THE PRESENT DISCLOSURE

The present disclosure relates to optical lens, in particular to a camera optical lens suitable for handheld devices such as smart phones and digital cameras and imaging devices.

DESCRIPTION OF RELATED ART

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but the photosensitive devices of general camera lens are no other than Charge Coupled Device (CCD) or Complementary metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices shrink, coupled with the current development trend of electronic products being that their functions should be better and their shape should be thin and small, miniature camera lens with good imaging quality therefor has become a mainstream in the market. In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. And, with the development of technology and the increase of the diverse demands of users, and under this circumstances that the pixel area of photosensitive devices is shrinking steadily and the requirement of the system for the imaging quality is improving constantly, the five-piece, six-piece and seven-piece lens structure gradually appear in lens design. There is an urgent need for ultra-thin wide-angle camera lenses which have good optical characteristics and the chromatic aberration of which is fully corrected.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

As referring toFIG. 1, the present invention provides a camera optical lens10.FIG. 1shows the camera optical lens10of embodiment 1 of the present invention, the camera optical lens10comprises 6 lenses. Specifically, from the object side to the image side, the camera optical lens10comprises in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. Optical element like optical filter GF can be arranged between the sixth lens L6and the image surface S1. The first lens L1is made of plastic material, the second lens L2is made of glass material, the third lens L3is made of plastic material, the fourth lens L4is made of glass material, the fifth lens L5is made of plastic material, and the sixth lens L6is made of plastic material.

Here, the focal length of the whole camera optical lens10is defined as f, the focal length of the first lens is defined as f1. The camera optical lens10further satisfies the following condition: −3≤f1/f≤−1, which fixes the negative refractive power of the first lens L1. If the upper limit of the set value is exceeded, although it benefits the ultra-thin development of lenses, but the negative refractive power of the first lens L1will be too strong, problem like aberration is difficult to be corrected, and it is also unfavorable for wide-angle development of lens. On the contrary, if the lower limit of the set value is exceeded, the negative refractive power of the first lens L1becomes too weak, it is then difficult to develop ultra-thin lenses. Preferably, the following condition shall be satisfied, −3≤f1/f≤−1.3.

The abbe number of the second lens L2is defined as v2, and the condition v2≥60 should be satisfied. The satisfied condition is beneficial to correction of aberration. Preferably, condition v2≥61 should be satisfied.

The refractive power of the fourth lens L4is defined as n4. Here the following condition should satisfied: 1.7≤n4≤2.2. This condition fixes the refractive power of the fourth lens L4, and refractive power within this range benefits the ultra-thin development of lenses, and it also benefits the correction of aberration. Preferably, the following condition shall be satisfied, 1.7≤n4≤2.0.

In this embodiment, the first lens L1has a negative refractive power with a convex object side surface relative to the proximal axis and a concave image side surface relative to the proximal axis.

The curvature radius of the object side surface of the first lens L1is defined as R1, the curvature radius of the image side surface of the first lens L1is defined as R2. The camera optical lens10further satisfies the following condition: 2.17≤(R1+R2)/(R1−R2)≤8.47, which fixes the shape of the first lens L1. When the value is beyond this range, with the development into the direction of ultra-thin and wide-angle lenses, problem like aberration of the off-axis picture angle is difficult to be corrected. Preferably, the condition 3.47≤(R1+R2)/(R1−R2)≤6.78 shall be satisfied.

The thickness on-axis of the first lens L1is defined as d1. The following condition: 0.12≤d1≤0.36 should be satisfied. When the condition is satisfied, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.19≤d1≤0.29 shall be satisfied.

In this embodiment, the second lens L2has a positive refractive power with a convex object side surface and a convex image side surface relative to the proximal axis.

The focal length of the whole camera optical lens10is f, the focal length of the second lens L2is f2. The following condition should be satisfied: 0.31≤f2/f≤1.14. When the condition is satisfied, the positive refractive power of the second lens L2is controlled within reasonable scope, the spherical aberration caused by the first lens L1which has negative refractive power and the field curvature of the system then can be reasonably and effectively balanced. Preferably, the condition 0.49≤f2/f≤0.92 should be satisfied.

The curvature radius of the object side surface of the second lens L2is defined as R3, the curvature radius of the image side surface of the second lens L2is defined as R4. The following condition should be satisfied: −1.93≤(R3+R4)/(R3−R4)≤−0.5, which fixes the shape of the second lens L2and can effectively correct aberration of the camera optical lens. Preferably, the following condition shall be satisfied, −1.2≤(R3+R4)/(R3−R4)≤−0.63.

The thickness on-axis of the second lens L2is defined as d3. The following condition: 0.26≤d3≤0.87 should be satisfied. When the condition is satisfied, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.41≤d3≤0.69 shall be satisfied.

In this embodiment, the third lens L3has a negative refractive power with a concave image side surface relative to the proximal axis.

The focal length of the whole camera optical lens10is f, the focal length of the third lens L3is f3. The following condition should be satisfied: −11.34≤f3/f≤−1.05, by which the field curvature of the system then can be reasonably and effectively balanced. Preferably, the condition −7.09≤f3/f≤−1.32 should be satisfied.

The curvature radius of the object side surface of the third lens L3is defined as R5, the curvature radius of the image side surface of the third lens L3is defined as R6. The following condition should be satisfied: 0.15≤(R5+R6)/(R5−R6)≤10.53, by which, with the development into the direction of ultra-thin and wide-angle lenses, problem like aberration of the off-axis picture angle is difficult to be corrected. Preferably, the following condition shall be satisfied, 0.24≤(R5+R6)/(R5−R6)≤8.43.

The thickness on-axis of the third lens L3is defined as d5. The following condition: 0.12≤d5≤0.72 should be satisfied. When the condition is satisfied, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.18≤d5≤0.58 shall be satisfied.

In this embodiment, the fourth lens L4has a positive refractive power with a concave object side surface and a convex image side surface relative to the proximal axis.

The focal length of the whole camera optical lens10is f, the focal length of the fourth lens L4is f4. The following condition should be satisfied: 0.53≤f4/f≤2.99, which can effectively reduce the sensitivity of lens group used in camera and further enhance the imaging quality. Preferably, the condition 0.84≤f4/f≤2.39 should be satisfied.

The curvature radius of the object side surface of the fourth lens L4is defined as R7, the curvature radius of the image side surface of the fourth lens L4is defined as R8. The following condition should be satisfied: 1.98≤(R7+R8)/(R7−R8)≤14.24, by which, with the development into the direction of ultra-thin and wide-angle lenses, problem like aberration of the off-axis picture angle is difficult to be corrected. Preferably, the following condition shall be satisfied, 3.16≤(R7+R8)/(R7−R8)≤11.39.

The thickness on-axis of the fourth lens L4is defined as d7. The following condition: 0.15≤d7≤0.72 should be satisfied. When the condition is satisfied, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.24≤d7≤0.58 shall be satisfied.

In this embodiment, the fifth lens L5has a positive refractive power with a convex object side surface and a concave image side surface relative to the proximal axis.

The focal length of the whole camera optical lens10is f, the focal length of the fifth lens L5is f5. The following condition should be satisfied: 1.28≤f5/f≤123.36, which can effectively smooth the light angles of the camera and reduce the tolerance sensitivity. Preferably, the condition 2.05≤f5/f≤98.69 should be satisfied.

The curvature radius of the object side surface of the fifth lens L5is defined as R9, the curvature radius of the image side surface of the fifth lens L5is defined as R10. The following condition should be satisfied: −14.75≤(R9+R10)/(R9−R10)≤1357.19, by which, the shape of the fifth lens L5is fixed, further, with the development into the direction of ultra-thin and wide-angle lenses, problem like aberration of the off-axis picture angle is difficult to be corrected. Preferably, the following condition shall be satisfied, −9.22≤(R9+R10)/(R9−R10)≤1085.75.

The thickness on-axis of the fifth lens L5is defined as d9. The following condition: 0.19≤d9≤0.83 should be satisfied. When the condition is satisfied, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.30≤d9≤0.66 shall be satisfied.

In this embodiment, the sixth lens L6has a negative refractive power with a concave object side surface and a concave image side surface relative to the proximal axis.

The focal length of the whole camera optical lens10is f, the focal length of the sixth lens L6is f6. The following condition should be satisfied: −1.98≤f6/f≤−0.58, which can effectively reduce the sensitivity of lens group used in camera and further enhance the imaging quality. Preferably, the condition −1.24≤f6/f≤−0.73 should be satisfied.

The curvature radius of the object side surface of the sixth lens L6is defined as R11, the curvature radius of the image side surface of the sixth lens L6is defined as R12. The following condition should be satisfied: −0.11≤(R11+R12)/(R11−R12)≤0.70, by which, the shape of the sixth lens L6is fixed, further, with the development into the direction of ultra-thin and wide-angle lenses, problem like aberration of the off-axis picture angle is difficult to be corrected. Preferably, the following condition shall be satisfied, −0.07≤(R11+R12)/(R11−R12)≤0.56.

The thickness on-axis of the sixth lens L6is defined as d11. The following condition: 0.12≤d11≤0.45 should be satisfied. When the condition is satisfied, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.19≤d11≤0.36 shall be satisfied.

The focal length of the whole camera optical lens10is f, the combined focal length of the first lens L1and the second lens L2is f12. The following condition should be satisfied: 0.51≤f12/f≤1.63, which can effectively avoid the aberration and field curvature of the camera optical lens, and can suppress the rear focal length for realizing the ultra-thin lens. Preferably, the condition 0.82≤f12/f≤1.31 should be satisfied.

In this embodiment, the total optical length TTL of the camera optical lens10is less than or equal to 5.60 mm, it is beneficial for the realization of ultra-thin lenses. Preferably, the total optical length TTL of the camera optical lens10is less than or equal to 5.35 mm.

In this embodiment, the aperture F number of the camera optical lens10is less than or equal to 2.16. A large aperture has better imaging performance. Preferably, the aperture F number of the camera optical lens10is less than or equal to 2.12.

With such design, the total optical length TTL of the whole camera optical lens10can be made as short as possible, thus the miniaturization characteristics can be maintained.

In the following, an example will be used to describe the camera optical lens10of the present invention. The symbols recorded in each example are as follows. The unit of distance, radius and center thickness is mm.

TTL: Optical length (the distance on-axis from the object side surface of the first lens L1to the image surface).

Preferably, inflexion points and/or arrest points can also be arranged on the object side surface and/or image side surface of the lens, so that the demand for high quality imaging can be satisfied, the description below can be referred for specific implementable scheme.

The design information of the camera optical lens10in the first embodiment of the present invention is shown in the following, the unit of the focal length, distance, radius and center thickness is mm.

The design information of the camera optical lens10in the first embodiment of the present invention is shown in the tables 1 and 2.

In which, the meaning of the various symbols is as follows.

R: The curvature radius of the optical surface, the central curvature radius in case of lens;

R1: The curvature radius of the object side surface of the first lens L1;

R2: The curvature radius of the image side surface of the first lens L1;

R3: The curvature radius of the object side surface of the second lens L2;

R4: The curvature radius of the image side surface of the second lens L2;

R5: The curvature radius of the object side surface of the third lens L3;

R6: The curvature radius of the image side surface of the third lens L3;

R7: The curvature radius of the object side surface of the fourth lens L4;

R8: The curvature radius of the image side surface of the fourth lens L4;

R9: The curvature radius of the object side surface of the fifth lens L5;

R10: The curvature radius of the image side surface of the fifth lens L5;

R11: The curvature radius of the object side surface of the sixth lens L6;

R12: The curvature radius of the image side surface of the sixth lens L6;

R13: The curvature radius of the object side surface of the optical filter GF;

R14: The curvature radius of the image side surface of the optical filter GF;

d: The thickness on-axis of the lens and the distance on-axis between the lens;

d0: The distance on-axis from aperture S1to the object side surface of the first lens L1;

d1: The thickness on-axis of the first lens L1;

d2: The distance on-axis from the image side surface of the first lens L1to the object side surface of the second lens L2;

d3: The thickness on-axis of the second lens L2;

d4: The distance on-axis from the image side surface of the second lens L2to the object side surface of the third lens L3;

d5: The thickness on-axis of the third lens L3;

d6: The distance on-axis from the image side surface of the third lens L3to the object side surface of the fourth lens L4;

d7: The thickness on-axis of the fourth lens L4;

d8: The distance on-axis from the image side surface of the fourth lens L4to the object side surface of the fifth lens L5;

d9: The thickness on-axis of the fifth lens L5;

d10: The distance on-axis from the image side surface of the fifth lens L5to the object side surface of the sixth lens L6;

d11: The thickness on-axis of the sixth lens L6;

d12: The distance on-axis from the image side surface of the sixth lens L6to the object side surface of the optical filter GF;

d13: The thickness on-axis of the optical filter GF;

d14: The distance on-axis from the image side surface to the image surface of the optical filter GF;

nd: The refractive power of the d line;

nd1: The refractive power of the d line of the first lens L1;

nd2: The refractive power of the d line of the second lens L2;

nd3: The refractive power of the d line of the third lens L3;

nd4: The refractive power of the d line of the fourth lens L4;

nd5: The refractive power of the d line of the fifth lens L5;

nd6: The refractive power of the d line of the sixth lens L6;

ndg: The refractive power of the d line of the optical filter GF;

v1: The abbe number of the first lens L1;

v2: The abbe number of the second lens L2;

v3: The abbe number of the third lens L3;

v4: The abbe number of the fourth lens L4;

v5: The abbe number of the fifth lens L5;

v6: The abbe number of the sixth lens L6;

vg: The abbe number of the optical filter GF.

Table 2 shows the aspherical surface data of the camera optical lens10in the embodiment 1 of the present invention.

For convenience, the aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (1). However, the present invention is not limited to the aspherical polynomials form shown in the condition (1).

Table 3 and table 4 show the inflexion points and the arrest point design data of the camera optical lens10lens in embodiment 1 of the present invention. In which, P1R1and P1R2represent respectively the object side surface and image side surface of the first lens L1, P2R1and P2R2represent respectively the object side surface and image side surface of the second lens L2, P3R1and P3R2represent respectively the object side surface and image side surface of the third lens L3, P4R1and P4R2represent respectively the object side surface and image side surface of the fourth lens L4, P5R1and P5R2represent respectively the object side surface and image side surface of the fifth lens L5, P6R1and P6R2represent respectively the object side surface and image side surface of the sixth lens L6. The data in the column named “inflexion point position” are the vertical distances from the inflexion points arranged on each lens surface to the optic axis of the camera optical lens10. The data in the column named “arrest point position” are the vertical distances from the arrest points arranged on each lens surface to the optic axis of the camera optical lens10.

TABLE 4Arrest point numberArrest point position 1P1R110.865P1R210.935P2R10P2R20P3R10P3R210.555P4R10P4R20P5R111.695P5R211.765P6R10P6R211.255

FIG. 2andFIG. 3show the longitudinal aberration and lateral color schematic diagrams after light with a wavelength of 470 nm, 555 nm and 650 nm passes the camera optical lens10in the first embodiment.FIG. 4shows the field curvature and distortion schematic diagrams after light with a wavelength of 555 nm passes the camera optical lens10in the first embodiment, the field curvature S inFIG. 4is a field curvature in the sagittal direction, T is a field curvature in the meridian direction.

Table 13 shows the various values of the embodiments 1, 2, 3, and the values corresponding with the parameters which are already specified in the conditions.

As shown in Table 13, the first embodiment satisfies the various conditions.

Embodiment 2 is basically the same as embodiment 1, the meaning of its symbols is the same as that of embodiment 1, in the following, only the differences are described.

Table 5 and table 6 show the design data of the camera optical lens20in embodiment 2 of the present invention.

Table 6 shows the aspherical surface data of each lens of the camera optical lens20in embodiment 2 of the present invention.

Table 7 and table 8 show the inflexion points and the arrest point design data of the camera optical lens20lens in embodiment 2 of the present invention.

FIG. 6andFIG. 7show the longitudinal aberration and lateral color schematic diagrams after light with a wavelength of 470 nm, 555 nm and 650 nm passes the camera optical lens20in the second embodiment.FIG. 8shows the field curvature and distortion schematic diagrams after light with a wavelength of 555 nm passes the camera optical lens20in the second embodiment.

As shown in Table 13, the second embodiment satisfies the various conditions.

Embodiment 3 is basically the same as embodiment 1, the meaning of its symbols is the same as that of embodiment 1, in the following, only the differences are described.

Table 9 and table 10 show the design data of the camera optical lens30in embodiment 3 of the present invention.

Table 10 shows the aspherical surface data of each lens of the camera optical lens30in embodiment 3 of the present invention.

Table 11 and table 12 show the inflexion points and the arrest point design data of the camera optical lens30lens in embodiment 3 of the present invention.

FIG. 10andFIG. 11show the longitudinal aberration and lateral color schematic diagrams after light with a wavelength of 470 nm, 555 nm and 650 nm passes the camera optical lens30in the third embodiment.FIG. 12shows the field curvature and distortion schematic diagrams after light with a wavelength of 555 nm passes the camera optical lens30in the third embodiment.

As shown in Table 13, the third embodiment satisfies the various conditions.