Camera optical lens

The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. 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. 201711151251.X and Ser. No. 201711151233.1 filed on Nov. 18, 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 L5and a sixth lens L6. Optical element like optical filter GF can be arranged between the sixth lens L6and the image surface Si. The first lens L1is made of plastic material, the second lens L2is made of plastic material, the third lens L3is made of plastic material, the fourth lens L4is made of plastic material, the fifth lens L5is made of glass material, 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, condition 0.1≤f1/f≤10 fixes the positive refractive power of the first lens L1. If the lower limit of the set value is exceeded, although it benefits the ultra-thin development of lenses, but the positive 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 upper limit of the set value is exceeded, the positive refractive power of the first lens becomes too weak, it is then difficult to develop ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.4≤f1/f≤5.4.

Condition 1.7≤n5≤2.2 fixes the refractive power n5of the fifth lens L5, 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, 1.71≤n5≤1.97.

Condition 0.01≤d9/TTL≤0.09 fixes the ratio between the thickness d9on-axis of the fifth lens L5and the total optical length TTL of the camera optical lens10, a ratio within this range can benefit the ultra-thin development of lenses. Preferably, the following condition shall be satisfied, 0.05≤d5/TTL≤0.09.

When the focal length of the camera optical lens10of the present invention, the focal length of each lens, the refractive power of the related lens, and the total optical length, the thickness on-axis and the curvature radius of the camera optical lens satisfy the above conditions, the camera optical lens10has the advantage of high performance and satisfies the design requirement of low TTL.

In this embodiment, the object side surface of the first lens L1is a convex object surface relative to the proximal axis, its image side surface is a concave surface relative to the proximal axis, and it has positive refractive power; the curvature radius of the object side surface of the first lens L1is R1, the curvature radius of image side surface of the first lens L1is R2, by meeting the condition −2.83≤(R1+R2)/(R1−R2)≤−0.77 the shape of the first lens can be reasonably controlled so that the system spherical aberration of the first lens can be effectively corrected; Preferably, the condition −1.77≤(R1+R2)/(R1−R2)≤−0.96 shall be satisfied.

The thickness on-axis of the first lens L1is d1, they satisfy the following condition: 0.30≤d1≤0.96, when the condition is meet, it is beneficial for realization of the ultra-thin lens. Preferably, the condition 0.47≤d1≤0.77 shall be satisfied.

In this embodiment, the object side surface of the second lens L2is a convex surface relative to the proximal axis, its image side surface is a concave surface relative to the proximal axis, and it has negative refractive power; the focal length of the whole camera optical lens10is f, the focal length of the second lens L2is f2, the curvature radius of the object side surface of the second lens L2is R3, the curvature radius of image side surface of the second lens L2is R4and the thickness on-axis of the second lens L2is d3, they satisfy the following condition: −3.88≤f2/f≤−1.02, when the condition is met, the negative refractive power of the second lens L2is controlled within reasonable scope, the spherical aberration caused by the first lens L1which has positive refractive power and the field curvature of the system then can be reasonably and effectively balanced; the condition 1.27≤(R3+R4)/(R3−R4)≤4.14 fixes the shape of the second lens L2, when value is beyond this range, with the development into the direction of ultra-thin and wide-angle lenses, problem like on-axis chromatic aberration is difficult to be corrected; if the condition 0.10≤d3≤0.44 is met, it is beneficial for the realization of ultra-thin lenses. Preferably, the following conditions shall be satisfied, −2.42≤f2/f≤−1.28; 2.04≤(R3+R4)/(R3−R4)≤3.31; 0.16≤d3≤0.35.

In this embodiment, the image side surface of the third lens L3is a convex surface relative to the proximal axis, and it has positive refractive power; the focal length of the whole camera optical lens10is f, the focal length of the third lens L3is f3, the curvature radius of the object side surface of the third lens L3is R5, the curvature radius of the image side surface of the third lens L3is R6and the thickness on-axis of the third lens L3is d5, they satisfy the condition: 1.30≤f3/f≤4.19, by meeting this condition, it is helpful for the system to obtain good ability in balancing the field curvature, so that the image quality can be effectively improved; by meeting the condition 0.44≤(R5+R6)/(R5−R6)≤1.70 the shape of the third lens L3can be effectively controlled, it is beneficial for the shaping of the third lens L3and bad shaping and stress generation due to extra large curvature of surface of the third lens L3can be avoided; when the condition 0.23≤d5≤0.74 is met, it is beneficial for the realization of ultra-thin lenses. Preferably, the following conditions shall be satisfied: 2.08≤f3/f≤3.35; 0.71≤(R5+R6)/(R5−R6)≤1.36; 0.36≤d5≤0.60.

In this embodiment, the object side surface of the fourth lens L4is a concave surface relative to the proximal axis, its image side surface is a convex surface relative to the proximal axis, and it has negative refractive power; the focal length of the whole camera optical lens10is f, the focal length of the fourth lens L4is f4, the curvature radius of the object side surface of the fourth lens L4is R7, the curvature radius of the image side surface of the fourth lens L4is R8and the thickness on-axis of the fourth lens L4is d7, they satisfy the condition: −5.01≤f4/f≤−1.43, the appropriate distribution of refractive power makes it possible that the system has better imaging quality and lower sensitivity; the condition −6.00≤(R7+R8)/(R7−R8)≤−1.48 fixes the shape of the fourth lens L4, when beyond this range, with the development into the direction of ultra-thin and wide-angle lens, the problem like chromatic aberration is difficult to be corrected; when the condition 0.20≤d7≤0.86 is met, it is beneficial for realization of ultra-thin lenses. Preferably, the following conditions shall be satisfied, −3.13≤f4/f≤−1.79; −3.75≤(R7+R8)/(R7−R8)≤−1.85; 0.31≤d7≤0.69.

In this embodiment, the object side surface of the fifth lens L5is a convex surface relative to the proximal axis, its image side surface is a concave surface relative to the proximal axis, and it has positive refractive power; the focal length of the whole camera optical lens10is f, the focal length of the fifth lens L5is f5, the curvature radius of the object side surface of the fifth lens L5is R9, the curvature radius of the image side surface of the fifth lens L5is R10and the thickness on-axis of the fifth lens L5is d9, they satisfy the condition: 0.50≤f5/f≤2.06, the limitation on the fifth lens L5can effectively make the light angle of the camera lens flat and the tolerance sensitivity reduces; the condition −4.40≤(R9+R10)/(R9−R10)≤−0.67 fixes the shape of the fifth lens L5, when beyond this range, with the development into the direction of ultra-thin and wide-angle lens, the problem like off-axis chromatic aberration is difficult to be corrected; when the condition 0.16≤d9≤0.69 is met, it is beneficial for the realization of ultra-thin lens. Preferably, the following conditions shall be satisfied: 0.80≤f5/f≤1.64; −2.75≤(R9+R10)/(R9−R10)≤−0.84; 0.25≤d9≤0.56.

In this embodiment, the object side surface of the sixth lens L6is a concave surface relative to the proximal axis, its image side surface is a convex surface relative to the proximal axis, and it has negative refractive power; the focal length of the whole camera optical lens10is f, the focal length of the sixth lens L6is f6, the curvature radius of the object side surface of the sixth lens L6is R11, the curvature radius of the image side surface of the sixth lens L6is R12and the thickness on-axis of the sixth lens L6is d11, they satisfy the condition: −1.55≤f6/f≤−0.47, the appropriate distribution of refractive power makes it possible that the system has better imaging quality and lower sensitivity; the condition −2.95≤(R11+R12)/(R11−R12)≤−0.94 fixes the shape of the sixth lens L6, when beyond this range, with the development into the direction of ultra-thin and wide-angle lenses, the problem like off-axis chromatic aberration is difficult to be corrected; when the condition 0.12≤d11≤0.53, is met, it is beneficial for the realization of ultra-thin lens. Preferably, the following conditions shall be satisfied, −0.97≤f6/f≤−0.59; −1.84≤(R11+R12)/(R11−R12)≤−1.17; 0.20≤d11≤0.42.

In this embodiment, the focal length of the whole camera optical lens10is f, a focal length of the first lens and the second lens combined is f12, they satisfy the condition: 0.55≤f12/f≤1.87. Hence, the chromatic aberration and the distortion of the camera optical lens can be eliminated, the back focal length of the camera optical lens can be suppressed, and the miniaturization of the camera optical lens can be sustained. Preferably, the following conditions shall be satisfied, 0.89≤f12/f≤1.50.

In this embodiment, the total optical length TTL of the camera optical lens10is less than or equal to 5.72 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 5.46 mm.

In this embodiment, the aperture F number of the camera optical lens10is less than or equal to 2.27. A large aperture has better imaging performance. Preferably, the aperture F number of the camera optical lens10is less than or equal to 2.22.

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 to the image surface of the first lens L1).

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 to 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 seventh lens L7;

R14: The curvature radius of the image side surface of the seventh lens L7;

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 seventh lens L7;

d13: The thickness on-axis of the seventh lens L7;

d14: The distance on-axis from the image side surface of the seventh lens L7to the object side 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.

FIG. 2andFIG. 3show the longitudinal aberration and lateral color schematic diagrams after light with a wavelength of 486 nm, 588 nm and 656 nm passes the camera optical lens10in the first embodiment.FIG. 4shows the field curvature and distortion schematic diagrams after light with a wavelength of 588 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 examples 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 the second embodiment of the present invention.

FIG. 6andFIG. 7show the longitudinal aberration and lateral color schematic diagrams after light with a wavelength of 486 nm, 588 nm and 656 nm passes the camera optical lens20in the second embodiment.FIG. 8shows the field curvature and distortion schematic diagrams after light with a wavelength of 588 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.

The design information of the camera optical lens30in the third embodiment of the present invention is shown in the tables 9 and 10.

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 486 nm, 588 nm and 656 nm passes the camera optical lens30in the third embodiment.FIG. 12shows the field curvature and distortion schematic diagrams after light with a wavelength of 588 nm passes the camera optical lens30in the third embodiment.

The following table 13, in accordance with the above conditions, lists the values in this embodiment corresponding with each condition expression. Apparently, the camera optical system of this embodiment satisfies the above conditions.

In this embodiment, the pupil entering diameter of the camera optical lens is 2.028 mm, the full vision field image height is 3.928 mm, the vision field angle in the diagonal direction is 82.33°, it has wide-angle and is ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.