WO2021127823A1 - Camera optical lens - Google Patents

Abstract

Disclosed is a camera optical lens (10), relating to the field of optical lenses, sequentially comprising, from an object side to an image side, a first lens (L1) having a positive refractive power, a second lens (L2) having a positive refractive power, a third lens (L3) having a positive refractive power, and a fourth lens (L4) having a negative refractive power, wherein the overall focal length of the optical camera lens (10) is f, the focal length of the first lens (L1) is f1, the focal length of the second lens (L2) is f2, the radius of curvature of the object side surface of the second lens (L2) is R3, the radius of curvature of the image side surface of the second lens (L2) is R4, the radius of curvature of the object side surface of the third lens (L3) is R5, the radius of curvature of the image side surface of the third lens (L3) is R6, and the on-axis thickness of the first lens (L1) is d1, which satisfy the following relational expressions: 1.50 ≤ f1/f ≤ 3.50; 2.50 ≤ f2/f ≤ 5.00; 5.00 ≤ (R5 + R6)/(R5 - R6) ≤ 12.00; 0.20 ≤ d1/f ≤ 0.30; -3.00 ≤ (R3 + R4)/(R3 - R4) ≤ -1.00. The camera optical lens (10) has a good optical performance, and meets the design requirements of a large aperture, a wide angle and ultra-thinness.

Description

Camera optical lens Technical field

The present 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 smartphones, the demand for miniaturized photographic lenses has increased. The photosensitive devices of general photographic lenses are nothing more than photosensitive coupling 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 the development trend of current electronic products with good functions, thin and short appearance, therefore, has a good The miniaturized camera lens with image quality has become the mainstream in the current market.

In order to obtain better imaging quality, the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element lens structure. However, with the development of technology and the increase in diversified needs of users, as the pixel area of photosensitive devices continues to shrink and the system's requirements for image quality continue to increase, the four-element lens structure gradually appears in the lens design. Although the four-element lens has good optical performance, its optical power, lens spacing and lens shape settings are still unreasonable, resulting in the lens structure not being able to meet good optical performance while meeting large aperture, Wide-angle and ultra-thin design requirements.

Summary of the invention

In view of the above-mentioned problems, the object of the present invention is to provide an imaging optical lens that has good optical performance while meeting the design requirements of large aperture, wide-angle, and ultra-thinness.

In order to solve the above technical problems, an embodiment of the present invention provides an imaging optical lens, from the object side to the image side, including: a first lens with positive refractive power, a second lens with positive refractive power, and positive refractive power. A powerful third lens, and a fourth lens with negative refractive power;

The overall focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, and the second lens image The radius of curvature of the side surface is R4, 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 axial thickness of the first lens is d1, and the following relationship is satisfied : 1.50≤f1/f≤3.50; 2.50≤f2/f≤5.00; 5.00≤(R5+R6)/(R5-R6)≤12.00; 0.20≤d1/f≤0.30; -3.00≤(R3+R4)/ (R3-R4)≤-1.00.

Preferably, the focal length of the fourth lens is f4, and satisfies the following relationship: -5.00≤f4/f≤-3.00.

Preferably, the radius of curvature of the object side surface of the fourth lens is R7, and the radius of curvature of the image side surface of the fourth lens is R8, and the following relationship is satisfied: 4.00≤(R7+R8)/(R7-R8)≤10.00 .

Preferably, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, the overall optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -15.60≤ (R1+R2)/(R1-R2)≤-1.53; 0.07≤d1/TTL≤0.29.

Preferably, the axial thickness of the second lens is d3, and the overall optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.06≤d3/TTL≤≤0.26.

Preferably, the focal length of the third lens is f3, the axial thickness of the third lens is d5, the overall optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.52≤f3/f≤2.94 ;0.05≤d5/TTL≤0.27.

Preferably, 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: 0.03≤d7/TTL≤0.27.

Preferably, the image height of the imaging optical lens is IH, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: TTL/IH≤2.20.

Preferably, the aperture F number of the imaging optical lens is FNO, and the following relational expression is satisfied: FNO≤1.40.

Preferably, the field of view of the imaging optical lens is FOV, and satisfies the following relationship: FOV≥72°.

The beneficial effects of the present invention are: the imaging optical lens according to the present invention has good optical performance, and has the characteristics of large aperture, wide angle, and ultra-thinness, 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 the drawings

FIG. 1 is a schematic diagram of the structure of an imaging optical lens in the first embodiment of the present invention;

FIG. 2 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 1;

3 is a schematic diagram of the structure of an imaging optical lens according to a second embodiment of the present invention;

4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 3;

5 is a schematic diagram of the structure of an imaging optical lens according to a third embodiment of the present invention;

FIG. 6 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 5.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, a person of ordinary skill in the art can understand that, in each embodiment of the present invention, many technical details are proposed 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 solution claimed by the present invention can be realized.

(First embodiment)

With reference to the 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. The imaging optical lens 10 includes four lenses. Specifically, the imaging optical lens 10 includes an aperture S1, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in order from the object side to the image side. An optical element such as an optical filter GF may be arranged between the fourth lens L4 and the image plane Si.

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

In this embodiment, the focal length of the imaging optical lens 10 is defined as f, the focal length of the first lens L1 is f1, the focal length of the second lens L2 is f2, and the curvature of the object side of the second lens L2 is 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 third lens L3 is R5, the radius of curvature of the image side of the third lens L3 is R6, and the radius of curvature of the image side of the third lens L3 is R6. The on-axis thickness of lens L1 is d1, which satisfies the following relationship:

1.50≤f1/f≤3.50 (1)

2.50≤f2/f≤5.00 (2)

5.00≤(R5+R6)/(R5-R6)≤12.00 (3)

0.20≤d1/f≤0.30 (4)

-3.00≤(R3+R4)/(R3-R4)≤-1.00 (5)

Conditional formula (1) specifies the ratio of the focal length of the first lens to the total focal length of the system, which can effectively balance the spherical aberration and field curvature of the system.

Conditional formula (2) specifies the ratio of the focal length of the second lens to the total focal length of the system, and corrects the aberration of the optical system, thereby improving the imaging quality.

The conditional formula (3) specifies the shape of the third lens. Within the range specified by the conditional formula, the degree of deflection of the light passing through the lens can be relaxed, and aberrations can be effectively reduced.

The conditional formula (4) specifies the ratio of the thickness of the first lens to the total focal length of the system, which helps to compress the total length of the optical system within the range of the conditional formula and achieves an ultra-thinning effect.

Conditional expression (5) specifies the shape of the second lens. When it is within this conditional range, it is beneficial to correct axial chromatic aberration.

The focal length of the imaging optical lens 10 is defined as f, and the focal length of the fourth lens L4 is f4, which satisfies the following relationship: -5.00≤f4/f≤-3.00, which specifies the ratio of the fourth lens focal length to the total focal length, Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

Define the radius of curvature of the object side surface of the fourth lens L4 as R7, and the radius of curvature of the image side surface of the fourth lens L4 as R8, satisfying the following relationship: 4.00≤(R7+R8)/(R7-R8)≤10.00, The shape of the fourth lens is specified. Outside this range, with the development of ultra-thin and wide-angle, it is difficult to correct the aberration of the off-axis angle of view.

Define the curvature radius of the object side surface of the first lens L1 as R1, and the curvature radius of the image side surface of the first lens L2 as R2, which satisfies the following relationship: -15.60≤(R1+R2)/(R1-R2)≤- 1.53. Reasonably control the shape of the first lens L1 so that the first lens L1 can effectively correct the spherical aberration of the system. Preferably, -9.75≤(R1+R2)/(R1-R2)≤-1.92 is satisfied.

The axial thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.07≤d1/TTL≤0.29. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.11≤d1/TTL≤0.23 is satisfied.

The on-axis thickness of the second lens L2 is defined as d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.06≤d3/TTL≤≤0.26. Within the range of the conditional expression, it is beneficial to achieve ultra Thinning. Preferably, 0.10≤d3/TTL≤0.21 is satisfied.

Define the focal length of the imaging optical lens 10 as f, and the focal length of the third lens L3 as f3, which satisfies the following relationship: 0.52≤f3/f≤2.94. Through reasonable distribution of optical power, the system has better Image quality and lower sensitivity. Preferably, 0.84≤f3/f≤2.35 is satisfied.

The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.05≤d5/TTL≤0.27. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.08≤d5/TTL≤0.22.

The on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03≤d7/TTL≤0.27. Within the range of the conditional formula, it is beneficial to realize ultra-thin化. Preferably, 0.04≤d7/TTL≤0.22.

In this embodiment, the image height of the imaging optical lens 10 is IH, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: TTL/IH≤2.20, thereby achieving ultra-thinness.

In this embodiment, the F-number FNO of the imaging optical lens 10 is less than or equal to 1.40, the aperture is large, and the imaging performance is good.

In this embodiment, the FOV of the imaging optical lens 10 is greater than or equal to 72°, thereby achieving a wide angle.

It is worth mentioning that, since the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 constituting the imaging optical lens 10 of this embodiment have the aforementioned structure and parameter relationship, the imaging The optical lens 10 can reasonably allocate the focal power, surface shape, material, and axial thickness of each lens, etc., and therefore correct various aberrations, and achieve good optical imaging performance while satisfying large aperture, Wide-angle and ultra-thin design requirements.

In addition, the imaging optical lens of this application is a TOF (Time of flight) receiving end lens. The principle of TOF technology is that the transmitting end lens emits an infrared surface light source, which is reflected back on the object, and the receiving end lens receives the reflected infrared light information. This process The 3D recognition process is realized. The working wavelength range of the imaging optical lens of this application is 920nm-960nm.

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

FIG. 1 is a schematic diagram of the structure of an imaging optical lens 10 in the first embodiment.

The design data of the imaging optical lens 10 in the first embodiment of the present invention is shown below. Table 1 lists the object side and image side curvature radius R of the first lens L1 to the fourth lens L4 constituting the imaging optical lens 10 in the first embodiment of the present invention, the center thickness of the lens, the distance d between the lenses, and the refractive index. nd and Abbe number vd. Table 2 shows the conic coefficient k and the aspherical coefficient of the imaging optical lens 10. It should be noted that, in this embodiment, the unit of distance, radius, and center thickness is millimeter (mm).

【Table 1】

The meaning of each symbol in the above table is as follows.

R: The radius of curvature of the optical surface, and the radius of curvature of the center of the 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 radius of curvature of the object side surface of the third lens L3;

R6: the radius of curvature of the image side surface 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 surface of the fourth lens L4;

R9: the curvature radius of the object side surface of the glass plate GF;

R10: the radius of curvature of the image side surface of the glass plate GF;

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

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

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

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

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

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

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

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

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

d8: the on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the optical filter GF;

d9: the on-axis thickness of the glass plate GF;

d10: the on-axis distance from the image side surface of the glass plate GF to the image surface Si;

nd: refractive index of 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;

ndg: the refractive index of the d-line 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;

vg: Abbe number of glass plate GF.

Table 2 shows the aspheric surface data of each lens of the imaging optical lens 10 provided by the first embodiment of the present invention.

【Table 2】

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

IH: Image height

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

It should be noted that the aspheric surface of each lens in this embodiment preferably uses the aspheric surface shown in the following conditional expression (6), but the specific form of the following conditional expression (6) is only an example. In fact, It is not limited to the aspheric polynomial form shown in the conditional expression (6).

Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of the embodiment of the present invention. Among them, P1R1 and P2R2 represent the object side and image side of the first lens L1 respectively, 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 surface and the image side surface of the fourth lens L4, respectively. The corresponding data in the “reflection point position” column is the vertical distance from the reflex point set on the surface of each lens 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 the surface of each lens to the optical axis of the imaging optical lens 10.

【table 3】

To	Number of recurve points	Recurve point position 1	Recurve point position 2
P1R1	1	0.905	To
P1R2	1	0.535	To
P2R1	2	0.415	1.045
P2R2	1	0.625	To
P3R1	2	0.525	0.905
P3R2	1	0.805	To
P4R1	2	0.555	1.325
P4R2	2	0.655	1.835

【Table 4】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	1	0.805	To
P2R1	1	0.625	To
P2R2	1	0.795	To
P3R1	0	To	To
P3R2	1	1.145	To
P4R1	2	1.105	1.485
P4R2	1	1.385	To

FIG. 2 shows a schematic diagram of field curvature and distortion after light with a wavelength of 940 nm passes through the imaging optical lens 10 of the first embodiment. The curvature of field S in FIG. 2 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.

The following Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.

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

In this embodiment, the imaging optical lens 10 has an entrance pupil diameter of 2.158mm, a full field of view image height of 1.96mm, a diagonal field of view angle of 78.20°, a large aperture, wide angle, ultra-thin, and Has excellent optical characteristics.

(Second embodiment)

3 is a schematic diagram of the structure of the imaging optical lens 20 in the second embodiment. The second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that 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 of 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 stagnation point of each lens in the imaging optical lens 20 of the embodiment of the present invention.

【Table 7】

To	Number of recurve points	Recurve point position 1	Recurve point position 2
P1R1	0	To	To
P1R2	0	To	To
P2R1	2	0.445	0.875
P2R2	2	0.595	1.115
P3R1	2	0.495	0.905
P3R2	2	0.815	1.155
P4R1	1	0.525	To
P4R2	2	0.705	1.775

【Table 8】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	0	To	To
P2R1	2	0.665	0.985
P2R2	1	0.755	To
P3R1	0	To	To
P3R2	0	To	To
P4R1	1	0.985	To
P4R2	1	1.385	To

FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 940 nm after passing through the imaging optical lens 20 of the second embodiment. The curvature of field S in FIG. 4 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.

The following Table 13 shows the corresponding values of various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.

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

In this embodiment, the imaging optical lens 20 has an entrance pupil diameter of 1.827mm, a full-field image height of 1.96mm, a diagonal viewing angle of 79.20°, a large aperture, wide angle, ultra-thin, and Has excellent optical characteristics.

(Third embodiment)

5 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 meaning of the symbols is the same as that 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 of 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 stagnation point of each lens in the imaging optical lens 30 of the embodiment of the present invention.

【Table 11】

To	Number of recurve points	Recurve point position 1	Recurve point position 2
P1R1	0	To	To
P1R2	1	0.605	To
P2R1	2	0.355	1.005
P2R2	2	0.395	1.165
P3R1	1	1.125	To
P3R2	2	1.115	1.325
P4R1	1	0.755	To
P4R2	1	0.725	To

【Table 12】

To	Number of stationary points	Stagnation position 1
P1R1	0	To
P1R2	1	0.885
P2R1	1	0.565
P2R2	1	0.615
P3R1	0	To
P3R2	0	To
P4R1	1	1.625
P4R2	1	1.665

FIG. 6 shows a schematic diagram of field curvature and distortion of light with a wavelength of 940 nm after passing through the imaging optical lens 30 of the third embodiment. The curvature of field S in FIG. 6 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.

The following Table 13 shows the corresponding values of various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.

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

In this embodiment, the imaging optical lens 30 has an entrance pupil diameter of 2.022mm, a full-field image height of 1.96mm, a diagonal viewing angle of 72.40°, a large aperture, wide angle, ultra-thin, and Has excellent optical characteristics.

The following Table 13 lists the values of the corresponding conditional expressions in the first embodiment, the second embodiment, and the third embodiment according to the above conditional expressions, as well as the values of other related parameters.

【Table 13】

Parameters and conditions	Example 1	Example 2	Example 3
f1/f	2.35	1.50	3.50
f2/f	2.92	2.50	5.00
(R5+R6)/(R5-R6)	5.43	5.00	11.95
d1/f	0.26	0.30	0.20
(R3+R4)/(R3-R4)	-1.36	-1.00	-3.00
f	2.438	2.284	2.830
f1	5.717	3.426	9.900
f2	7.122	5.710	14.147
f3	3.961	4.474	2.969
f4	-8.193	-6.852	-14.147
f12	3.427	2.437	6.079
Fno	1.13	1.25	1.40

Among them, Fno is the aperture F number of the imaging optical lens, and f12 is the combined focal length of the first lens L1 and the second lens L2.

A person 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 them in form and details without departing from the spirit and spirit of the present invention. range.

Claims (10)

1. An imaging optical lens, characterized in that the imaging optical lens, from the object side to the image side, includes: a first lens with positive refractive power, a second lens with positive refractive power, and a first lens with positive refractive power. Three lenses, and a fourth lens with negative refractive power;

   The overall focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, and the second lens image The radius of curvature of the side surface is R4, 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 axial thickness of the first lens is d1, and the following relationship is satisfied :

   1.50≤f1/f≤3.50;

   2.50≤f2/f≤5.00;

   5.00≤(R5+R6)/(R5-R6)≤12.00;

   0.20≤d1/f≤0.30;

   -3.00≤(R3+R4)/(R3-R4)≤-1.00.
2. The imaging optical lens of claim 1, wherein the focal length of the fourth lens is f4, and satisfies the following relationship:

   -5.00≤f4/f≤-3.00.
3. The imaging optical lens of claim 1, wherein the radius of curvature of the object side surface of the fourth lens is R7, and the radius of curvature of the image side surface of the fourth lens is R8, and the following relationship is satisfied:

   4.00≤(R7+R8)/(R7-R8)≤10.00.
4. The imaging optical lens of claim 1, wherein the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, and the overall optical length of the imaging optical lens It is TTL and satisfies the following relationship:

   -15.60≤(R1+R2)/(R1-R2)≤-1.53;

   0.07≤d1/TTL≤0.29.
5. The imaging optical lens of claim 1, wherein the axial thickness of the second lens is d3, and the overall optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   0.06≤d3/TTL≤≤0.26.
6. The imaging optical lens of claim 1, wherein the focal length of the third lens is f3, the axial thickness of the third lens is d5, and the overall optical length of the imaging optical lens is TTL, and Satisfy the following relations:

   0.52≤f3/f≤2.94;

   0.05≤d5/TTL≤0.27.
7. The imaging optical lens of claim 1, wherein the axial thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   0.03≤d7/TTL≤0.27.
8. The imaging optical lens of claim 1, wherein the image height of the imaging optical lens is IH, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: TTL/IH≤2.20.
9. The imaging optical lens of claim 1, wherein the aperture F number of the imaging optical lens is FNO, and the following relationship is satisfied: FNO≤1.40.
10. The imaging optical lens of claim 1, wherein the field of view of the imaging optical lens is FOV, and satisfies the following relationship: FOV≥72°.

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