CN110749979A - Image pickup optical lens - Google Patents

Abstract

The invention provides an imaging optical lens. From the object side to the image side, the imaging optical lens sequentially includes a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with negative refractive power. lens, the fourth lens with positive refractive power, and the fifth lens with negative refractive power, and satisfy the following relational expressions: -0.45≤f1/f2≤‑0.28; -2.80≤f2/f≤‑1.80;‑1.70≤( R1+R2)/(R1‑R2)≤‑1.35; 1.24≤(R3+R4)/(R3‑R4)≤1.65; 1.10≤(R7+R8)/(R7‑R8)≤1.40; 0.88≤d8/ d9≤1.40; the camera optical lens not only has good optical performance, but also meets the design requirements of wide-angle and ultra-thin.

Description

Camera optics

【Technical field】

The invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as 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 is increasing day by day, and the photosensitive devices of general photographic lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (Complementary Metal Semiconductor) -Oxide Semiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing process technology, the pixel size of the photosensitive device has been reduced, and the current electronic products have a trend of good functions and light, thin and short appearance. Therefore, with Miniaturized camera lenses with good imaging quality have become the mainstream in the current market.

In order to obtain better image quality, the lenses traditionally mounted on mobile phone cameras mostly use three-piece, four-piece, or even five-piece or six-piece lens structures. Although the common five-piece lens already has good optical performance, its optical power, lens spacing and lens shape setting are still unreasonable to a certain extent, resulting in the lens structure having good optical performance and unable to meet the large aperture. , Ultra-thin, wide-angle design requirements.

[Content of the invention]

In view of the above problems, the purpose of the present invention is to provide an imaging optical lens, which has good optical performance and at the same time meets the design requirements of large aperture, ultra-thinning, and wide-angle. In order to solve the above-mentioned technical problems, embodiments of the present invention provide an imaging optical lens, which sequentially includes, from the object side to the image side: a first lens with positive refractive power, a second lens with negative refractive power, and a negative refractive power The third lens, the fourth lens with positive refractive power, and the fifth lens with negative refractive power; wherein, the overall focal length of the imaging optical lens is f, the focal length of the first lens is f1, and the second lens The focal length of the lens is f2, 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, the radius of curvature of the object side of the second lens is R3, the The radius of curvature of the image side of the second lens is R4, 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 on-axis thickness of the fifth lens is d9, the on-axis distance from the image side of the fourth lens to the object side of the fifth lens is d8, which satisfies the following relationship: -0.45≤f1/f2≤-0.28; -2.80≤f2/f≤-1.80 ;-1.70≤(R1+R2)/(R1-R2)≤-1.35; 1.24≤(R3+R4)/(R3-R4)≤1.65; 1.10≤(R7+R8)/(R7-R8)≤1.40 ; 0.88≤d8/d9≤1.40.

Preferably, the following relationship is also satisfied: 0.74≤f1/f≤0.84.

Preferably, the on-axis thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.07≤d1/TTL≤0.22.

Preferably, the on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.02≤d3/TTL≤0.08.

Preferably, the focal length of the third lens is f3, the radius of curvature of the object side of the third lens is R5, the radius of curvature of the image side of the third lens is R6, and the on-axis thickness of the third lens is is d5, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship: -65.39≤f3/f≤-4.21; -32.60≤(R5+R6)/(R5-R6)≤-0.97; 0.02≤ d5/TTL≤0.11.

Preferably, the focal length of the fourth lens is f4, the axial thickness of the fourth lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.29≤f4/f≤1.41; 0.07≤d7/TTL≤0.32.

Preferably, 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 total optical length of the imaging optical lens is TTL, and satisfy the following relationship: -1.29≤f5/f≤-0.30; -0.13≤(R9+R10)/(R9-R10)≤1.39; 0.03≤d9/TTL≤0.13.

Preferably, the combined focal length of the first lens and the second lens is f12, and satisfies the following relationship: 0.52≤f12/f≤1.63.

Preferably, the field of view of the imaging optical lens is FOV, and satisfies the following relationship: FOV≥78°.

Preferably, the total optical length of the imaging optical lens is TTL, the image height of the imaging optical lens is IH, and the following relationship is satisfied: TTL/IH≤1.42.

The beneficial effects of the present invention are that the imaging optical lens according to the present invention has good optical performance, and has the characteristics of large aperture, wide angle, and ultra-thin thickness, and is especially suitable for mobile phones composed of high-pixel CCD, CMOS and other imaging elements Camera lens assembly and WEB camera lens.

【Description of drawings】

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

1 is a schematic structural diagram of an imaging optical lens according to Embodiment 1;

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

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

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

5 is a schematic structural diagram of an imaging optical lens according to Embodiment 2;

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

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

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

9 is a schematic structural diagram of an imaging optical lens according to Embodiment 3;

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

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

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

13 is a schematic structural diagram of an imaging optical lens according to Embodiment 4;

Fig. 14 is a schematic diagram of axial aberration of the imaging optical lens shown in Fig. 13;

15 is a schematic diagram of the magnification chromatic aberration of the imaging optical lens shown in FIG. 13;

FIG. 16 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 13 .

【Detailed ways】

The present invention will be further described below with reference to the accompanying drawings and embodiments.

In order to make the objectives, technical solutions and advantages of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can appreciate that, in the various embodiments of the present invention, many technical details are set forth for the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present invention can be realized.

(Embodiment 1)

Please refer to FIG. 1 to FIG. 4 together, the present invention provides the imaging optical lens 10 of the first embodiment. In FIG. 1 , the left side is the object side, and the right side is the image side. The imaging optical lens 10 mainly includes five lenses, from the object side to the image side, the aperture S1, the first lens L1, the second lens L2, the third lens Lens L3, fourth lens L4 and fifth lens L5. A glass flat plate GF is provided between the fifth lens L5 and the image plane Si, and the glass flat plate GF may be a glass cover plate or an optical filter.

In this embodiment, the first lens L1 has a positive refractive power; the second lens L2 has a negative refractive power; the third lens L3 has a negative refractive power; the fourth lens L4 has a positive refractive power; and the fifth lens L5 has a negative refractive power .

Here, define the overall focal length of the imaging optical lens 10 as f, the focal length of the first lens L1 as f1, the focal length of the second lens L2 as f2, the curvature radius of the object side surface of the first lens L1 as R1, and the focal length of the first lens L2 as The radius of curvature of the image side is R2, the radius of curvature of the object side of the second lens L2 is R3, the radius of curvature of the image side of the second lens L2 is R4, the radius of curvature of the object side of the fourth lens L4 is R7, and the fourth lens The radius of curvature of the image side of L4 is R8, the on-axis thickness of the fifth lens L5 is d9, and the on-axis distance from the image side of the fourth lens L4 to the object side of the fifth lens L5 is d8, which satisfies the following relationship:

-0.45≤f1/f2≤-0.28 (1)

-2.80≤f2/f≤-1.80 (2)

-1.70≤(R1+R2)/(R1-R2)≤-1.35 (3)

1.24≤(R3+R4)/(R3-R4)≤1.65 (4)

1.10≤(R7+R8)/(R7-R8)≤1.40 (5)

0.88≤d8/d9≤1.40 (6)

Among them, the conditional formula (1) specifies the ratio of the focal length f1 of the first lens L1 to the focal length f2 of the second lens L2, and through the reasonable distribution of the focal length, the system has better imaging quality and lower sensitivity.

Conditional formula (2) specifies the ratio of the focal length f2 of the second lens L2 to the total focal length f of the system, which can effectively balance the spherical aberration and field curvature of the system.

Conditional formula (3) specifies the shape of the first lens L1, and within the range specified by the conditional formula, the degree of deflection of light passing through the lens can be relaxed, and aberrations can be effectively reduced.

Conditional expression (4) specifies the shape of the second lens L2, and within the range of the conditional expression, contributes to improving the performance of the optical system.

Conditional expression (5) specifies the shape of the fourth lens L4, and when the shape is within this range, it is beneficial to correct the aberration of the off-axis picture angle with the progress of ultra-thin and wide-angle.

Conditional formula (6) specifies the ratio of the on-axis distance d8 from the image side of the fourth lens L4 to the object side of the fifth lens L5 to the on-axis thickness d9 of the fifth lens L5, which helps to compress the optical system within the range of the conditional formula Overall length to achieve ultra-thin effect.

In this embodiment, the imaging optical lens also satisfies the following relational formula: 0.74≤f1/f≤0.84, which specifies the ratio of the focal length f1 of the first lens L1 to the total focal length f of the system, which helps to improve the optical system performance. Preferably, 0.60≤f1/f≤1.00 is satisfied.

The axial thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.07≤d1/TTL≤0.22, which is beneficial to realize ultra-thinning. Preferably, 0.10≤d1/TTL≤0.18 is satisfied.

The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.02≤d3/TTL≤0.08, which is beneficial to realize ultra-thinning. Preferably, 0.04≤d3/TTL≤0.07 is satisfied.

The focal length of the third lens L3 is f3, which satisfies the following relationship: -65.39≤f3/f≤-4.21, through the reasonable distribution of the optical power, the system has better imaging quality and lower sensitivity. Preferably, -40.87≤f3/f≤-5.26 is satisfied.

The curvature radius of the object side of the third lens L3 is R5, and the curvature radius of the image side of the third lens L3 is R6, which satisfies the following relationship: -32.60≤(R5+R6)/(R5-R6)≤-0.97, which can be effectively controlled The shape of the third lens L3 facilitates the molding of the third lens L3, and avoids molding defects and stress caused by the excessively large surface curvature of the third lens L3. Preferably, -20.38≤(R5+R6)/(R5-R6)≤-1.22 is satisfied.

The axial thickness of the third lens L3 is d5, which satisfies the following relational expression: 0.02≤d5/TTL≤0.11, which is conducive to realizing ultra-thinning. Preferably, 0.04≤d5/TTL≤0.08 is satisfied.

The focal length of the fourth lens L4 is f4, which satisfies the following relationship: 0.29≤f4/f≤1.41. Through the reasonable distribution of the optical power, the system has better imaging quality and lower sensitivity. Preferably, 0.46≤f4/f≤1.13 is satisfied.

The axial thickness of the fourth lens L4 is d7, which satisfies the following relational formula: 0.07≤d7/TTL≤0.32, which is conducive to realizing ultra-thinning. Preferably, 0.11≤d7/TTL≤0.26 is satisfied.

The focal length f5 of the fifth lens L5 satisfies the following relationship: -1.29≤f5/f≤-0.30. The limitation of the fifth lens L5 can effectively make the light angle of the imaging lens smooth and reduce the tolerance sensitivity. Preferably, -0.80≤f5/f≤-0.37 is satisfied.

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 relationship: -0.13≤(R9+R10)/(R9-R10)≤1.39, which specifies the fifth lens L5. When the shape of the lens L5 is within the range, along with the development of ultra-thin and wide-angle, it is beneficial to correct problems such as aberration of the off-axis picture angle. Preferably, -0.08≤(R9+R10)/(R9-R10)≤1.11 is satisfied.

The on-axis thickness of the fifth lens L5 is d9, which satisfies the following relational formula: 0.03≤d9/TTL≤0.13, which is conducive to realizing ultra-thinning. Preferably, 0.06≤d9/TTL≤0.10 is satisfied.

The combined focal length of the first lens L1 and the second lens L2 is f12, which satisfies the following relationship: 0.58≤f12/f≤1.63. Within the range of the conditional expression, the aberration and distortion of the imaging optical lens 10 can be eliminated, and the back focal length of the imaging optical lens 10 can be suppressed to maintain the miniaturization of the imaging lens system group. Preferably, 0.92≤f12/f≤1.57 is satisfied.

In addition, in the imaging optical lens 10 provided in this embodiment, the surface of each lens can be set as an aspherical surface, and the aspherical surface can be easily made into a shape other than a spherical surface, so as to obtain more control variables to reduce aberrations, thereby reducing the use of lenses Therefore, the total length of the imaging optical lens 10 can be effectively reduced.

It is worth mentioning that, since the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have the aforementioned structure and parameter relationship, the imaging optical lens 10 can be reasonably The power, spacing, and shape of each lens are assigned, and various types of aberrations are corrected accordingly.

In this embodiment, the field of view of the imaging optical lens 10 is greater than or equal to 78°, thereby realizing the widening of the imaging optical lens.

In this embodiment, the ratio of the total optical length TTL to the image height IH of the imaging optical lens 10 is less than or equal to 1.42, thereby realizing ultra-thinning of the imaging optical lens.

When the focal length of the imaging optical lens 10, the focal length of each lens and the radius of curvature of the present invention satisfy the above relational expressions, the imaging optical lens 10 can have good optical performance, and can satisfy the requirements of large aperture, wide angle, and ultra-thinning. Design requirements: According to the characteristics of the optical lens 10, the optical lens 10 is especially suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. In this way, the imaging optical lens 10 can meet the design requirements of wide-angle and ultra-thin design while having good optical imaging performance.

The imaging optical lens 10 of the present invention will be described below by way of examples. The symbols described in each example are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of inflection point and position of stagnation point is mm.

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

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

The design data of the imaging optical lens 10 shown in FIG. 1 is shown below.

Table 1 lists the curvature radius of the object side surface and the curvature radius R of the image side surface of the first lens L1 to the fifth lens L5 constituting the imaging optical lens 10 in the first embodiment of the present invention, the on-axis thickness of each lens, the distance between two adjacent lenses distance d, refractive index nd and Abbe number νd. It should be noted that, in this embodiment, the units of R and d are both millimeters (mm).

【Table 1】

The meanings of the symbols in the above table are as follows.

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

S1: aperture;

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

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

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

R4: the radius of curvature 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 radius of curvature 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 radius of curvature 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 radius of curvature of the object side surface of the glass plate GF;

R12: The curvature radius of the image side of the glass plate GF;

d: the on-axis thickness of each lens or the on-axis distance between two adjacent lenses;

d0: the on-axis distance from the aperture S1 to the object side surface of the first lens L1;

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

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

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

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

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

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

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

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

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

d10: the on-axis distance from the image side of the fifth lens L5 to the object side of the glass plate GF;

d11: On-axis thickness of glass plate GF;

d12: the axial distance from the image side of the glass plate GF to the image plane Si;

nd: refractive index;

nd1: the refractive index of the first lens L1;

nd2: the refractive index of the second lens L2;

nd3: the refractive index of the third lens L3;

nd4: the refractive index of the fourth lens L4;

nd5: the refractive index of the fifth lens L5;

ndg: the refractive index of the glass plate GF;

vd: Abbe number;

v1: Abbe number of the first lens L1;

v2: Abbe number of the second lens L2;

v3: Abbe number of the third lens L3;

v4: Abbe number of the fourth lens L4;

v5: Abbe number of the fifth lens L5;

vg: Abbe number of glass plate GF.

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

【Table 2】

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients.

IH: like high

y=(x ² /R)/[1+{1-(k+1)(x ² /R ² )} ^1/2 ]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰ (7)

For convenience, the aspherical surfaces of the respective lens surfaces are those shown in the above formula (7). However, the present invention is not limited to the aspheric polynomial form represented by the formula (7).

Table 3 and Table 4 show the design data of the inflection point and the stagnation point of each lens in the imaging optical lens 10 according to the embodiment of the present invention. Among them, P1R1 and P2R2 represent the object side and the image side of the first lens L1 respectively, P2R1 and P2R2 respectively represent the object side and the image side of the second lens L2, P3R1 and P3R2 respectively represent the object side and the image side of the third lens L3, P4R1 and P4R2 represent the object side and the image side of the fourth lens L4, respectively. P5R1 and P5R2 represent the object side and the image side of the fifth lens L5, respectively. The corresponding data in the column of "invagination point position" is the vertical distance from the inflexion point set on the surface of each lens to the optical axis of the imaging optical lens 10 . The corresponding data in the column of "stagnation point position" is the vertical distance from the stagnation point set on the surface of each lens to the optical axis of the imaging optical lens 10 .

【table 3】

Number of inflection points Inflection point position 1 Inflection point position 2 Inflection point position 3 P1R1 0 P1R2 1 0.275 P2R1 0 P2R2 0 P3R1 0 P3R2 1 0.875 P4R1 3 1.105 1.415 1.705 P4R2 2 1.115 1.595 P5R1 2 1.275 2.245 P5R2 2 0.485 2.435

【Table 4】

In addition, in the following Table 17, the values corresponding to the various parameters in the first embodiment and the parameters specified in the conditional expressions are also listed.

2 and 3 respectively show schematic diagrams of axial aberration and magnification chromatic aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 435 nm after passing through the imaging optical lens 10 . FIG. 4 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 10 . 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.

In this embodiment, the entrance pupil diameter of the imaging optical lens 10 is 1.562 mm, the image height of the full field of view is 3.282 mm, the field of view in the diagonal direction is 80.00°, it is wide-angle, ultra-thin, and has excellent optical characteristics.

(Embodiment 2)

5 is a schematic structural diagram of the imaging optical lens 20 in the second embodiment. The second embodiment is basically the same as the first embodiment, and the meanings of the symbols in the following list are also the same as those of the first embodiment. Therefore, the same parts will not be repeated here. List the differences.

Tables 5 and 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 aspherical 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 the inflection point and the stagnation point of each lens in the imaging optical lens 20 .

【Table 7】

【Table 8】

Number of stagnation points stagnation position 1 stagnation position 2 P1R1 0 P1R2 0 P2R1 2 0.305 0.725 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 2.115 P5R2 1 1.305

In addition, in the following Table 17, the values corresponding to various parameters in the second embodiment and the parameters specified in the conditional expressions are also listed.

6 and 7 respectively show schematic diagrams of axial aberration and magnification chromatic aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 435 nm after passing through the imaging optical lens 20 . FIG. 8 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 20 . The field curvature S in FIG. 8 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

In this embodiment, the entrance pupil diameter of the imaging optical lens 20 is 1.944mm, the image height of the full field of view is 3.264mm, and the angle of view in the diagonal direction is 79.20°. It is wide-angle, ultra-thin, and has excellent optical characteristics.

(Embodiment 3)

9 is a schematic diagram of the structure of the imaging optical lens 30 in the third embodiment. The third embodiment is basically the same as the first embodiment, and the meanings of the symbols in the following list are also the same as those of the first embodiment. Therefore, the same parts will not be repeated here. List the differences.

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 aspherical surface data of each lens in the imaging optical lens 30 according to 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 .

【Table 11】

【Table 12】

Number of stagnation points stagnation position 1 P1R1 0 P1R2 1 0.785 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 2.135 P5R2 1 1.085

In addition, in the following Table 17, the values corresponding to various parameters in the third embodiment and the parameters specified in the conditional expressions are also listed.

10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm passes through the imaging optical lens 30 . FIG. 12 shows a schematic diagram of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 30 .

The field curvature S in FIG. 12 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

In this embodiment, the entrance pupil diameter of the imaging optical lens 30 is 1.853mm, the image height of the full field of view is 3.186mm, and the field of view in the diagonal direction is 78.40°. It is wide-angle, ultra-thin, and has excellent optical characteristics.

(Embodiment 4)

13 is a schematic structural diagram of the imaging optical lens 40 in the fourth embodiment. The fourth embodiment is basically the same as the first embodiment, and the meanings of the symbols in the following list are also the same as those of the first embodiment. Therefore, the same parts will not be repeated here. List the differences.

Table 13 and Table 14 show the design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

【Table 13】

Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to Embodiment 4 of the present invention.

【Table 14】

Table 15 and Table 16 show the design data of the inflection point and the stagnation point of each lens in the imaging optical lens 40 .

【Table 15】

Number of inflection points Inflection point position 1 Inflection point position 2 Inflection point position 3 Inflection point position 4 P1R1 1 0.885 P1R2 1 0.535 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 4 1.085 1.575 1.625 1.865 P4R2 3 0.975 1.725 1.925 P5R1 2 1.225 2.385 P5R2 3 0.505 2.255 2.735

【Table 16】

In addition, in the following Table 17, the values corresponding to various parameters in the fourth embodiment and the parameters specified in the conditional expressions are also listed.

14 and 15 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm passes through the imaging optical lens 40 . FIG. 16 shows a schematic diagram of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 40 . The field curvature S in FIG. 16 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

In this embodiment, the entrance pupil diameter of the imaging optical lens 40 is 1.816mm, the image height of the full field of view is 3.266mm, and the field of view in the diagonal direction is 80.00°. It is wide-angle, ultra-thin, and has excellent optical characteristics.

The following Table 17 lists the numerical values of the corresponding conditional expressions in Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, as well as the values of other relevant parameters, according to the above-mentioned conditional expressions.

【Table 17】

Parameters and Conditionals Example 1 Example 2 Example 3 Example 4 f1/f2 -0.40 -0.30 -0.38 -0.38 f2/f -1.85 -2.77 -1.96 -2.03 (R1+R2)/(R1-R2) -1.36 -1.56 -1.65 -1.64 (R3+R4)/(R3-R4) 1.62 1.26 1.44 1.46 (R7+R8)/(R7-R8) 1.14 1.40 1.35 1.31 d8/d9 1.35 1.05 0.90 0.89 f 3.747 3.870 3.799 3.722 f1 2.810 3.217 2.844 2.856 f2 -6.948 -10.723 -7.463 -7.540 f3 -38.146 -24.414 -97.810 -121.700 f4 3.523 2.578 2.178 2.139 f5 -2.408 -2.148 -1.697 -1.691 f12 4.063 4.201 3.951 3.969 FNO 2.399 1.991 2.050 2.050

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims (10)

1. An imaging optical lens, comprising, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;

wherein a focal length of the entire imaging optical lens is f, a focal length of the first lens is f1, a focal length of the second lens is f2, a curvature radius of an object-side surface of the first lens is R1, a curvature radius of an image-side surface of the first lens is R2, a curvature radius of an object-side surface of the second lens is R3, a curvature radius of an image-side surface of the second lens is R4, a curvature radius of an object-side surface of the fourth lens is R7, a curvature radius of an image-side surface of the fourth lens is R8, an axial thickness of the fifth lens is d9, and an axial distance from the image-side surface of the fourth lens to the object-side surface of the fifth lens is d8, and the following relations are satisfied:

-0.45≤f1/f2≤-0.28；

-2.80≤f2/f≤-1.80；

-1.70≤(R1+R2)/(R1-R2)≤-1.35；

1.24≤(R3+R4)/(R3-R4)≤1.65；

1.10≤(R7+R8)/(R7-R8)≤1.40；

0.88≤d8/d9≤1.40。

2. the imaging optical lens according to claim 1, further satisfying the following relationship:

0.74≤f1/f≤0.84。

3. a photographic optical lens according to claim 1, wherein the on-axis thickness of the first lens element is d1, the total optical length of the photographic optical lens is TTL, and the following relation is satisfied:

0.07≤d1/TTL≤0.22。

4. a photographic optical lens according to claim 1, wherein the on-axis thickness of the second lens element is d3, the total optical length of the photographic optical lens is TTL, and the following relationship is satisfied:

0.02≤d3/TTL≤0.08。

5. the imaging optical lens of claim 1, wherein the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, the on-axis thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

-65.39≤f3/f≤-4.21。

-32.60≤(R5+R6)/(R5-R6)≤-0.97；

0.02≤d5/TTL≤0.11。

6. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fourth lens element is f4, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

0.29≤f4/f≤1.41；

0.07≤d7/TTL≤0.32。

7. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:

-1.29≤f5/f≤-0.30；

-0.13≤(R9+R10)/(R9-R10)≤1.39；

0.03≤d9/TTL≤0.13。

8. an image-pickup optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relational expression is satisfied:

0.52≤f12/f≤1.63。

9. the imaging optical lens according to claim 1, wherein a field angle of the imaging optical lens is FOV, and satisfies the following relation:

FOV≥78°。

10. a camera optical lens according to claim 1, wherein the total optical length of the camera optical lens is TTL, the image height of the camera optical lens is IH, and the following relationship is satisfied:

TTL/IH≤1.42。

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