CN108227135A - Camera optical camera lens - Google Patents

Abstract

The invention relates to the field of optical lenses, and discloses a photographic optical lens, which sequentially comprises from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and The sixth lens, the first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of glass material, and the fifth lens is made of plastic material. The sixth lens is made of plastic material, the second lens has positive refractive power, and the third lens has negative refractive power; and the following relational expressions are satisfied: -3≤f1/f≤-1.5; 1.7≤n4≤2.2; 0.03≤d7/TTL≤0.06. The imaging optical lens can obtain low TTL while obtaining high imaging performance.

Description

Camera Optical Lens

technical field

The invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging devices such as monitors and PC lenses.

Background technique

In recent years, with the rise of smart phones, the demand for miniaturized photographic lenses has been increasing, and the photosensitive devices of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor devices (Complementary Metal -OxideSemiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing process technology, the pixel size of photosensitive devices has been reduced, and today's electronic products are developing with good functions and thin, light and small appearance. Therefore, it has good Miniaturized camera lenses with image quality have become the mainstream in the market. In order to obtain better imaging quality, traditional lenses mounted on mobile phone cameras mostly adopt a three-element or four-element lens structure. Moreover, with the development of technology and the increase in the diversified needs of users, the pixel area of the photosensitive device is continuously shrinking, and the system's requirements for imaging quality are continuously improving. Five-piece, six-piece, and seven-piece lens structures Gradually appear in the lens design. There is an urgent need for a wide-angle camera lens with excellent optical characteristics, ultra-thin, and fully compensated for chromatic aberration.

Contents of the invention

In view of the above problems, the object of the present invention is to provide an imaging optical lens, which can meet the requirements of ultra-thinning and wide-angle while obtaining high imaging performance.

In order to solve the above-mentioned technical problem, the embodiment of the present invention provides a kind of photographing optical lens, described photographing optical lens, comprises from object side to image side in sequence: a first lens, a second lens, a third lens, a fourth lens , a fifth lens, and a sixth lens; the second lens has a positive refractive power, and the third lens has a negative refractive power;

The first lens is made of plastic material, the second lens is made of plastic 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 Made of plastic.

The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the refractive index of the fourth lens is n4, the axial thickness of the fourth lens is d7, and the optical The total length is TTL, which satisfies the following relationship:

-3≤f1/f≤-1.5;

1.7≤n4≤2.2;

0.03≤d7/TTL≤0.06.

Compared with the prior art, the embodiment of the present invention utilizes the arrangement of the above-mentioned lenses to utilize the common cooperation of lenses with specific relationships in the focal length, refractive index, optical total length of the imaging optical lens, axial thickness, and radius of curvature. , so that the camera optical lens can meet the requirements of ultra-thin and wide-angle while obtaining high imaging performance.

Preferably, the imaging optical lens satisfies the following relational expressions: -3≤f1/f≤-1.6; 1.7≤n4≤2.0.

Preferably, the first lens has a negative refractive power, its object side is convex on the paraxial axis, and its image side is concave on the paraxial axis; the curvature radius of the object side of the first lens is R1, and the image of the first lens is The radius of curvature of the side surface is R2, and the axial thickness of the first lens is d1, and the following relations are satisfied: 2.67≤(R1+R2)/(R1-R2)≤11.35; 0.12≤d1≤0.42.

Preferably, the imaging optical lens satisfies the following relational expressions: 4.28≤(R1+R2)/(R1-R2)≤9.08; 0.18≤d1≤0.34.

Preferably, the second lens has a positive refractive power, its object side is convex on the paraxial axis, and its image side is convex on the paraxial axis; the focal length of the imaging optical lens is f, and the focal length of the second lens is f2 , the radius of curvature of the object side of the second lens is R3, the radius of curvature of the image side of the second lens is R4, the axial thickness of the second lens is d3, and the following relationship is satisfied: 0.31≤f2/f ≤1.18; -1.70≤(R3+R4)/(R3-R4)≤-0.46; 0.28≤d3≤0.95.

Preferably, the imaging optical lens satisfies the following relational expressions: 0.49≤f2/f≤0.94; -1.06≤(R3+R4)/(R3-R4)≤-0.57; 0.44≤d3≤0.76.

Preferably, the third lens has negative refractive power; the focal length of the imaging optical lens is f, the focal length of the third lens is f3, the radius of curvature of the object side of the third lens is R5, and the third lens The radius of curvature of the lens image side is R6, the axial thickness of the third lens is d5, and satisfies the following relational formula: -11.03≤f3/f≤-1.64; -3.05≤(R5+R6)/(R5-R6 )≤4.69; 0.12≤d5≤0.49.

Preferably, the imaging optical lens satisfies the following relational expressions: -6.89≤f3/f≤-2.05; -1.91≤(R5+R6)/(R5-R6)≤3.75; 0.18≤d5≤0.39.

Preferably, the fourth lens has positive refractive power, its object side is concave on the paraxial axis, and its image side is convex on the paraxial axis; the focal length of the imaging optical lens is f, and the focal length of the fourth lens is f4 , the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the following relationship is satisfied: 1.27≤f4/f ≤19.97; 4.08≤(R7+R8)/(R7-R8)≤35.79; 0.12≤d7≤0.44.

Preferably, the imaging optical lens satisfies the following relational expressions: 2.04≤f4/f≤15.97; 6.52≤(R7+R8)/(R7-R8)≤28.63; 0.18≤d7≤0.35.

Preferably, the fifth lens has positive refractive power, and its image side is convex on the paraxial axis; the focal length of the imaging optical lens is f, the focal length of the fifth lens is f5, and the object side of the fifth lens is The radius of curvature is R9, the radius of curvature of the image side of the fifth lens is R10, the axial thickness of the fifth lens is d9, and satisfies the following relational formula: 0.33≤f5/f≤2.71; -0.80≤(R9+ R10)/(R9-R10)≤3.77; 0.32≤d9≤1.70.

Preferably, the imaging optical lens satisfies the following relational expressions: 0.53≤f5/f≤2.17; -0.50≤(R9+R10)/(R9-R10)≤3.02; 0.52≤d9≤1.36.

Preferably, the sixth lens has negative refractive power, and its image side is concave on the paraxial; the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, and the object side of the sixth lens is The radius of curvature is R11, the radius of curvature of the image side of the sixth lens is R12, the axial thickness of the sixth lens is d11, and satisfies the following relationship: -1.63≤f6/f≤-0.44; -1.13≤( R11+R12)/(R11-R12)≤2.82; 0.12≤d11≤1.37.

Preferably, the imaging optical lens satisfies the following relational expressions: -1.02≤f6/f≤-0.54; -0.71≤(R11+R12)/(R11-R12)≤2.25; 0.18≤d11≤1.09.

Preferably, the focal length of the imaging optical lens is f, the combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied: 0.49≤f12/f≤1.76.

Preferably, the imaging optical lens satisfies the following relationship: 0.78≤f12/f≤1.41.

Preferably, the total optical length TTL of the imaging optical lens is less than or equal to 6.63 mm.

Preferably, the total optical length TTL of the imaging optical lens is less than or equal to 6.33 mm.

Preferably, the aperture F number of the imaging optical lens is less than or equal to 2.16.

Preferably, the aperture F number of the imaging optical lens is less than or equal to 2.12.

The beneficial effect of the present invention is that: the photographing optical lens according to the present invention has excellent optical characteristics, is ultra-thin, has a wide angle and fully corrects chromatic aberration, and is especially suitable for a mobile phone camera lens composed of high-pixel CCD, CMOS and other imaging elements. Components and WEB camera lens.

Description of drawings

Fig. 1 is the structural representation of the imaging optical lens of the first embodiment of the present invention;

Fig. 2 is the axial aberration schematic diagram of photographing optical lens shown in Fig. 1;

Fig. 3 is a schematic diagram of magnification chromatic aberration of the imaging optical lens shown in Fig. 1;

Fig. 4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in Fig. 1;

5 is a schematic structural view of an imaging optical lens according to a second embodiment of the present invention;

Fig. 6 is a schematic diagram of the axial aberration of the imaging optical lens shown in Fig. 5;

Fig. 7 is a schematic diagram of magnification chromatic aberration of the imaging optical lens shown in Fig. 5;

Fig. 8 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in Fig. 5;

9 is a schematic structural view of an imaging optical lens according to a third embodiment of the present invention;

Fig. 10 is a schematic diagram of the axial aberration of the imaging optical lens shown in Fig. 9;

Fig. 11 is a schematic diagram of magnification chromatic aberration of the imaging optical lens shown in Fig. 9;

FIG. 12 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 9 .

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present invention, many technical details are proposed in order to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in the present invention can also be realized.

(first embodiment)

Referring to the accompanying drawings, the present invention provides an imaging optical lens 10 . FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10 includes, from the object side to the image side 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. Lens L6. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.

The first lens L1 is made of plastic material, the second lens L2 is made of plastic material, the third lens L3 is made of plastic material, the fourth lens L4 is made of glass material, the fifth lens L5 is made of plastic material, and the sixth lens L6 is made of plastic material.

The second lens L2 has a positive refractive power, and the third lens L3 has a negative refractive power;

Here, the focal length of the overall imaging optical lens 10 is defined as f, the focal length of the first lens L1 is f1, and -3≤f1/f≤-1.5 specifies the negative refractive power of the first lens L1. When the value exceeds the lower limit, although it is conducive to the development of ultra-thin lenses, the negative refractive power of the first lens L1 will be too strong, making it difficult to correct problems such as aberrations, and it is not conducive to the development of wide-angle lenses. On the contrary, when the specified upper limit value is exceeded, the negative refractive power of the first lens element will become too weak, and it is difficult to develop ultra-thin lenses. Preferably, -3≤f1/f≤-1.6 is satisfied.

Define the refractive index n4 of the fourth lens L4, 1.7≤n4≤2.2, which specifies the refractive index of the fourth lens L4, within this range it is more conducive to the development of ultra-thinning, and at the same time it is beneficial to correct aberrations. Preferably, 1.7≤n4≤2.0 is satisfied.

The axial thickness of the fourth lens L4 is defined as d7, and the total optical length of the imaging optical lens is TTL, 0.03≤d7/TTL≤0.06, which stipulates the axial thickness of the fourth lens L4 and the optical total length TTL of the imaging optical lens 10 The ratio is conducive to the realization of ultra-thin.

When the focal length of the imaging optical lens 10 of the present invention, the focal length of each lens, the refractive index of the relevant lens, the optical total length of the imaging optical lens, the axial thickness and the radius of curvature satisfy the above relational expression, the imaging optical lens 10 can be made to have a high Performance, and meet the design requirements of low TTL.

In this embodiment, the object side of the first lens L1 is convex at the paraxial position, and the image side is concave at the paraxial position, and has negative refractive power.

The radius of curvature of the object side of the first lens L1 is R1, and the radius of curvature of the image side of the first lens L1 is R2, satisfying the following relationship: 2.67≤(R1+R2)/(R1-R2)≤11.35, the first lens should be reasonably controlled The shape of the first lens can effectively correct the spherical aberration of the system; preferably, 4.28≤(R1+R2)/(R1-R2)≤9.08.

The axial thickness of the first lens L1 is d1, which satisfies the following relationship: 0.12≦d1≦0.42, which is beneficial to realize ultra-thinning. Preferably, 0.18≤d1≤0.34.

In this embodiment, the object side of the second lens L2 is convex at the paraxial position, and the image side is convex at the paraxial position, and has positive refractive power.

The focal length of the overall imaging optical lens 10 is f, the focal length of the second lens L2 is f2, and the following relationship is satisfied: 0.31≤f2/f≤1.18. By controlling the positive refractive power of the second lens L2 within a reasonable range, a reasonable and effective The spherical aberration generated by the first lens L1 with positive power and the field curvature of the system are well balanced. Preferably, 0.49≤f2/f≤0.94.

The radius of curvature of the object side of the second lens L2 is R3, and the radius of curvature of the image side of the second lens L2 is R4, satisfying the following relational formula: -1.70≤(R3+R4)/(R3-R4)≤-0.46, which stipulates the first When the shape of the second lens L2 is outside the range, it is difficult to correct axial chromatic aberration as the lens becomes ultra-thin and wide-angle. Preferably, -1.06≤(R3+R4)/(R3-R4)≤-0.57.

The axial thickness of the second lens L2 is d3, which satisfies the following relationship: 0.28≦d3≦0.95, which is beneficial to realize ultra-thinning. Preferably, 0.44≤d3≤0.76.

In this embodiment, the object side of the third lens L3 is concave at the paraxial position, and the image side is convex at the paraxial position, and has negative refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the third lens L3 is f3, which satisfies the following relationship: -11.03≤f3/f≤-1.64, which is conducive to the system's ability to obtain a good balance of field curvature to effectively improve image quality . Preferably, -6.89≤f3/f≤-2.05.

The radius of curvature of the object side of the third lens L3 is R5, and the radius of curvature of the image side of the third lens L3 is R6, satisfying the following relationship: -3.05≤(R5+R6)/(R5-R6)≤4.69, which can effectively control the third lens L3 The shape of the three lenses L3 is beneficial to the shaping of the third lens L3, and avoids poor molding and stress caused by excessive surface curvature of the third lens L3. Preferably, -1.91≤(R5+R6)/(R5-R6)≤3.75.

The axial thickness of the third lens L3 is d5, which satisfies the following relationship: 0.12≦d5≦0.49, which is beneficial to realize ultra-thinning. Preferably, 0.18≤d5≤0.39.

In this embodiment, the object side of the fourth lens L4 is concave at the paraxial position, and the image side is convex at the paraxial position, and has positive refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the fourth lens L4 is f4, which satisfies the following relationship: 1.27≤f4/f≤19.97. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, 2.04≤f4/f≤15.97.

The radius of curvature R7 on the object side of the fourth lens L4 and the radius of curvature R8 on the image side of the fourth lens L4 satisfy the following relational formula: 4.08≤(R7+R8)/(R7-R8)≤35.79, which specifies that the fourth lens L4 When the shape is outside the range, with the development of ultra-thin and wide-angle, it is difficult to correct the aberration of the off-axis viewing angle. Preferably, 6.52≤(R7+R8)/(R7-R8)≤28.63.

The axial thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.12≦d7≦0.44, which is beneficial to realize ultra-thinning. Preferably, 0.18≤d7≤0.35.

In this embodiment, the object side of the fifth lens L5 is convex at the paraxial position, and the image side is convex at the paraxial position, and has positive refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the fifth lens L5 is f5, which satisfies the following relationship: 0.33≤f5/f≤2.71. The limitation of the fifth lens L5 can effectively make the light angle of the imaging lens gentle and reduce Tolerance sensitivity. Preferably, 0.53≤f5/f≤2.17.

The radius of curvature of the object side of the fifth lens L5 is R9, and the radius of curvature of the image side of the fifth lens L5 is R10, which satisfies the following relational formula: -0.80≤(R9+R10)/(R9-R10)≤3.77. When the shape of the five-lens L5 is outside the range of conditions, with the development of ultra-thin and wide-angle, it is difficult to correct problems such as aberrations at off-axis viewing angles. Preferably, -0.50≤(R9+R10)/(R9-R10)≤3.02.

The axial thickness of the fifth lens L5 is d9, which satisfies the following relationship: 0.32≦d9≦1.70, which is beneficial to realize ultra-thinning. Preferably, 0.52≤d9≤1.36.

In this embodiment, the object side of the sixth lens L6 is concave at the paraxial position, the image side is concave at the paraxial position, and has negative refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the sixth lens L6 is f6, which satisfies the following relationship: -1.63≤f6/f≤-0.44. The system has better imaging quality and higher low sensitivity. Preferably, -1.02≤f6/f≤-0.54.

The radius of curvature of the object side of the sixth lens L6 is R11, and the radius of curvature of the image side of the sixth lens L6 is R12, satisfying the following relational formula: -1.13≤(R11+R12)/(R11-R12)≤2.82, which is stipulated by the When the shape of the six-lens L6 is outside the range of conditions, it is difficult to correct problems such as aberrations at off-axis viewing angles due to the development of ultra-thin and wide-angle lenses. Preferably, -0.71≤(R11+R12)/(R11-R12)≤2.25.

The axial thickness of the sixth lens L6 is d11, which satisfies the following relationship: 0.12≦d11≦1.37, which is beneficial to realize ultra-thinning. Preferably, 0.18≤d11≤1.09.

In this embodiment, the focal length of the imaging optical lens is f, the combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied: 0.49≦f12/f≦1.76. Thereby, the aberration and distortion of the imaging optical lens can be eliminated, the back focal length of the imaging optical lens can be suppressed, and the miniaturization of the image lens system group can be maintained. Preferably, 0.78≤f12/f≤1.41.

In this embodiment, the total optical length TTL of the imaging optical lens 10 is less than or equal to 6.63 millimeters, which is beneficial to realize ultra-thinning. Preferably, the total optical length TTL of the imaging optical lens 10 is less than or equal to 6.33 mm.

In this embodiment, the aperture F number of the imaging optical lens 10 is less than or equal to 2.16. Large aperture, good imaging performance. Preferably, the aperture F number of the imaging optical lens 10 is less than or equal to 2.12.

With such a design, the total optical length TTL of the overall imaging optical lens 10 can be shortened as much as possible, and the characteristic of miniaturization can be maintained.

The imaging optical lens 10 of the present invention will be described below with examples. The symbols described in each example are as follows. The unit of distance, radius and center thickness is mm.

TTL: optical length (the on-axis distance from the object side of the first lens L1 to the imaging plane);

Preferably, an inflection point and/or a stagnation point can also be set on the object side and/or the image side of the lens to meet high-quality imaging requirements. For specific implementations, refer to the following description.

The following shows the design data of the imaging optical lens 10 according to the first embodiment of the present invention, and the unit of focal length, distance, radius and central thickness is mm.

Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

【Table 1】

Among them, the meaning of each symbol is as follows.

S1: aperture;

R: the radius of curvature of the optical surface, and the radius of curvature of the center of the lens;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

d0: the axial distance from the aperture S1 to the object side of the first lens L1;

d1: axial thickness of the first lens L1;

d2: the axial distance from the image side of the first lens L1 to the object side of the second lens L2;

d3: axial thickness of the second lens L2;

d4: On-axis distance from the image side of the second lens L2 to the object side of the third lens L3;

d5: axial thickness of the third lens L3;

d6: On-axis distance from the image side of the third lens L3 to the object side of the fourth lens L4;

d7: axial thickness of the fourth lens L4;

d8: On-axis distance from the image side of the fourth lens L4 to the object side of the fifth lens L5;

d9: axial thickness of the fifth lens L5;

d10: the axial distance from the image side of the fifth lens L5 to the object side of the sixth lens L6;

d11: axial thickness of the sixth lens L6;

d12: On-axis distance from the image side of the sixth lens L6 to the object side of the optical filter GF;

d13: axial thickness of optical filter GF;

d14: On-axis distance from the image side of the optical filter GF to the image plane;

nd: the refractive index of the d line;

nd1: the refractive index of the d line of the first lens L1;

nd2: the refractive index of the d line of the second lens L2;

nd3: the refractive index of the d line of the third lens L3;

nd4: the refractive index of the d line of the fourth lens L4;

nd5: the refractive index of the d line of the fifth lens L5;

nd6: the refractive index of the d-line of the sixth lens L6;

ndg: the refractive index of the d line of the optical filter GF;

vd: Abbe number;

v1: the Abbe number of the first lens L1;

v2: 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: Abbe number of the optical filter GF.

Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

【Table 2】

Among them, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16 are aspheric coefficients.

IH: image height

y＝(x ² /R)/[1+{1-(k+1)(x ² /R ² )} ^1/2 ]+A4x ⁴ +A6x6+A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ + A16x ¹⁶ (1)

For convenience, the aspheric surface shown in the above formula (1) is used for the aspheric surface of each lens surface. However, the present invention is not limited to the aspheric polynomial form represented by this formula (1).

Table 3 and Table 4 show the design data of inflection point and stagnation point of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Wherein, P1R1 and P1R2 respectively represent the object side and image side of the first lens P1, P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively, and P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively, P4R1 and P4R2 represent the object side and image side of the fourth lens L4 respectively, P5R1 and P5R2 represent the object side and image side of the fifth lens L5 respectively, and P6R1 and P6R2 represent the object side and image side of the sixth lens L6 respectively. The data corresponding to the column of “inflection point position” is the vertical distance from the inflection point set on each lens surface to the optical axis of the imaging optical lens 10 . The data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on each lens surface to the optical axis of the imaging optical lens 10 .

【table 3】

【Table 4】

FIG. 2 and FIG. 3 respectively show schematic diagrams of axial aberration and lateral chromatic aberration of light with wavelengths of 470 nm, 555 nm and 650 nm passing through the imaging optical lens 10 of the first embodiment. Fig. 4 shows a schematic diagram of field curvature and distortion of light having a wavelength of 555 nm passing through the imaging optical lens 10 of the first embodiment. The field curvature S in Fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. song.

Table 13 that appears later shows the values corresponding to the various numerical values in Examples 1, 2, and 3 and the parameters already specified in the conditional formula.

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

In this embodiment, the entrance pupil diameter of the imaging optical lens is 1.8920 mm, the image height of the full field of view is 2.994 mm, and the angle of view in the diagonal direction is 73.82°. It is wide-angle and ultra-thin. External chromatic aberration is fully corrected and has excellent optical characteristics.

(second embodiment)

The second embodiment is basically the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.

Table 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

【table 5】

Table 6 shows the aspheric surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

【Table 6】

Table 7 and Table 8 show the design data of inflection point and stagnation point of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

【Table 7】

【Table 8】

FIG. 6 and FIG. 7 respectively show schematic diagrams of axial aberration and lateral chromatic aberration of light with wavelengths of 470 nm, 555 nm and 650 nm passing through the imaging optical lens 20 of the second embodiment. FIG. 8 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm passing through the imaging optical lens 20 of the second embodiment.

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

In this embodiment, the entrance pupil diameter of the imaging optical lens is 1.9333 mm, the image height of the full field of view is 2.994 mm, and the field of view angle in the diagonal direction is 73.09°. It is wide-angle and ultra-thin. External chromatic aberration is fully corrected and has excellent optical characteristics.

(third embodiment)

The third embodiment is basically the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.

Table 9 and Table 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

【Table 9】

Table 10 shows the aspheric surface data of each lens in the imaging optical lens 30 of the third embodiment of the present invention.

【Table 10】

Table 11 and Table 12 show the design data of the inflection point and the stagnation point of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

【Table 11】

【Table 12】

FIG. 10 and FIG. 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification of light with wavelengths of 470nm, 555m and 650nm passing through the imaging optical lens 30 of the third embodiment. FIG. 12 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm passing through the imaging optical lens 30 of the third embodiment.

Table 13 below lists the numerical values corresponding to the conditional expressions in this embodiment according to the above conditional expressions. Obviously, the imaging optical system of this embodiment satisfies the above conditional expression.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 1.9178mm, the image height of the full field of view is 2.994mm, and the field angle in the diagonal direction is 73.01°. It is wide-angle and ultra-thin. External chromatic aberration is fully corrected and has excellent optical characteristics.

【Table 13】

Those of ordinary skill in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present invention, and in practical applications, various changes can be made to it in form and details without departing from the spirit and spirit of the present invention. scope.

Claims (20)

1. A photographing optical lens, characterized in that, said photographing optical lens comprises sequentially from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and the first lens Six lenses; the second lens has positive refractive power, and the third lens has negative refractive power; The first lens is made of plastic material, the second lens is made of plastic 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 Made of plastic. The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the refractive index of the fourth lens is n4, the axial thickness of the fourth lens is d7, and the optical The total length is TTL, which satisfies the following relationship: -3≤f1/f≤-1.5; 1.7≤n4≤2.2; 0.03≤d7/TTL≤0.06. 2. imaging optical lens according to claim 1, is characterized in that, described imaging optical lens satisfies the following relational expression: -3≤f1/f≤-1.6; 1.7≤n4≤2.0. 3. The imaging optical lens according to claim 1, wherein the first lens has a negative refractive power, its object side is convex on the paraxial axis, and its image side is concave on the paraxial axis; The radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the first lens is R2, and the axial thickness of the first lens is d1, and satisfy the following relationship: 2.67≤(R1+R2)/(R1-R2)≤11.35; 0.12≤d1≤0.42. 4. imaging optical lens according to claim 3, is characterized in that, described imaging optical lens satisfies the following relational expression: 4.28≤(R1+R2)/(R1-R2)≤9.08; 0.18≤d1≤0.34. 5. The imaging optical lens according to claim 1, wherein the object side of the second lens is convex at the paraxial, and its image side is convex at the paraxial; The focal length of the imaging optical lens is f, the focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, the radius of curvature of the image side of the second lens is R4, and the second The axial thickness of the lens is d3, and it satisfies the following relationship: 0.31≤f2/f≤1.18; -1.70≤(R3+R4)/(R3-R4)≤-0.46; 0.28≤d3≤0.95. 6. The imaging optical lens according to claim 5, wherein the imaging optical lens satisfies the following relational expression: 0.49≤f2/f≤0.94; -1.06≤(R3+R4)/(R3-R4)≤-0.57; 0.44≤d3≤0.76. 7. imaging optical lens according to claim 1, is characterized in that; the focal length of described imaging optical lens is f, and the focal length of described 3rd lens is f3, and the radius of curvature of described 3rd lens object side is R5, The radius of curvature of the image side of the third lens is R6, the axial thickness of the third lens is d5, and satisfies the following relationship: -11.03≤f3/f≤-1.64; -3.05≤(R5+R6)/(R5-R6)≤4.69; 0.12≤d5≤0.49. 8. The imaging optical lens according to claim 7, wherein the imaging optical lens satisfies the following relational expression: -6.89≤f3/f≤-2.05; -1.91≤(R5+R6)/(R5-R6)≤3.75; 0.18≤d5≤0.39. 9. The imaging optical lens according to claim 1, wherein the fourth lens has positive refractive power, its object side is concave on the paraxial axis, and its image side is convex on the paraxial axis; The focal length of the imaging optical lens is f, the focal length of the fourth lens is f4, the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, and the fourth lens is R8. The axial thickness of the lens is d7, and it satisfies the following relationship: 1.27≤f4/f≤19.97; 4.08≤(R7+R8)/(R7-R8)≤35.79; 0.12≤d7≤0.44. 10. The imaging optical lens according to claim 9, wherein the imaging optical lens satisfies the following relational expression: 2.04≤f4/f≤15.97; 6.52≤(R7+R8)/(R7-R8)≤28.63; 0.18≤d7≤0.35. 11. The imaging optical lens according to claim 1, wherein the fifth lens has positive refractive power, and its image side is convex on the paraxial axis; The focal length of the imaging optical lens is f, the focal length of the fifth lens is f5, the radius of curvature of the object side of the fifth lens is R9, the radius of curvature of the image side of the fifth lens is R10, and the fifth lens is R10. The axial thickness of the lens is d9, and it satisfies the following relationship: 0.33≤f5/f≤2.71; -0.80≤(R9+R10)/(R9-R10)≤3.77; 0.32≤d9≤1.70. 12. The imaging optical lens according to claim 11, characterized in that, the imaging optical lens satisfies the following relational expression: 0.53≤f5/f≤2.17; -0.50≤(R9+R10)/(R9-R10)≤3.02; 0.52≤d9≤1.36. 13. The imaging optical lens according to claim 1, wherein the sixth lens has a negative refractive power, and its image side is concave on the paraxial axis; The focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, and the sixth lens is R12. The axial thickness of the lens is d11, and it satisfies the following relationship: -1.63≤f6/f≤-0.44; -1.13≤(R11+R12)/(R11-R12)≤2.82; 0.12≤d11≤1.37. 14. The imaging optical lens according to claim 13, characterized in that, the imaging optical lens satisfies the following relational expression: -1.02≤f6/f≤-0.54; -0.71≤(R11+R12)/(R11-R12)≤2.25; 0.18≤d11≤1.09. 15. The imaging optical lens according to claim 1, wherein the focal length of the imaging optical lens is f, and the combined focal length of the first lens and the second lens is f, and satisfies the following relational expression: 0.49≤f12/f≤1.76. 16. The imaging optical lens according to claim 15, characterized in that, the imaging optical lens satisfies the following relational expression: 0.78≤f12/f≤1.41. 17. The imaging optical lens according to claim 1, wherein the total optical length TTL of the imaging optical lens is less than or equal to 6.63 millimeters. 18. The imaging optical lens according to claim 17, characterized in that, the total optical length TTL of the imaging optical lens is less than or equal to 6.33 mm. 19. The imaging optical lens according to claim 1, wherein the aperture F number of the imaging optical lens is less than or equal to 2.16. 20. The imaging optical lens according to claim 19, characterized in that the aperture F number of the imaging optical lens is less than or equal to 2.12.