CN111077644A

CN111077644A - Image pickup optical lens

Info

Publication number: CN111077644A
Application number: CN201911335885.XA
Authority: CN
Inventors: 孙伟
Original assignee: Ruisheng Communication Technology Changzhou Co Ltd
Current assignee: Ruisheng Communication Technology Changzhou Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-04-28
Anticipated expiration: 2039-12-23
Also published as: CN111077644B

Abstract

The invention provides an optical lens for shooting, which sequentially comprises the following components 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; a focal length of the first lens element is f1, a focal length of the entire imaging optical lens is f, a focal length of the third lens element is f3, a radius of curvature of an object-side surface of the third lens element is R5, a radius of curvature of an image-side surface of the third lens element is R6, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, a radius of curvature of an image-side surface of the second lens element is R3, an on-axis thickness of the second lens element is d3, an on-axis thickness of the first lens element is d1, an on-axis distance from the image-side surface of the first lens element to the object-side surface of the second lens element is d2, and the following: f1/f is more than or equal to 0.65 and less than or equal to 0.80; 3.00-20.00 (R5+ R6)/(R5-R6); f3/f is more than or equal to minus 20.00 and less than or equal to minus 8.00; d1/d2 is more than or equal to 10.00 and less than or equal to 15.00; R9/R10 is more than or equal to 3.00 and less than or equal to 12.00; r3/d3 is more than or equal to-100.00 and less than or equal to-15.00.

Description

Image pickup optical lens

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device, and due to the refinement of Semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed in a form of being excellent in function, light, thin, short and small, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market.

In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts three-piece, four-piece, or even five-piece or six-piece lens structures. However, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, the five-piece lens structure gradually appears in the lens design, although the common five-piece lens has good optical performance, the focal power, the lens interval and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.

[ summary of the invention ]

In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.

The technical scheme of the invention is as follows:

an imaging optical lens includes, 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 first lens element is f1, a focal length of the entire image pickup optical lens assembly is f, a focal length of the third lens element is f3, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of an image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the second lens element is R3, an on-axis thickness of the second lens element is d3, an on-axis thickness of the first lens element is d1, an on-axis distance from the image-side surface of the first lens element to the object-side surface of the second lens element is d2, and the following relationships are satisfied: f1/f is more than or equal to 0.65 and less than or equal to 0.80; 3.00-20.00 (R5+ R6)/(R5-R6); f3/f is more than or equal to minus 20.00 and less than or equal to minus 8.00; d1/d2 of not less than 10.00

15.00；3.00≤R9/R10≤12.00；-100.00≤R3/d3≤-15.00。

Preferably, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the following relationships are satisfied: 2.00-5.00 (R7+ R8)/(R7-R8).

Preferably, the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, and the total optical length of the imaging optical lens system is TTL and satisfies the following relational expression: -1.99 ≤ (R1+ R2)/(R1-R2) is ≤ 0.39; d1/TTL is more than or equal to 0.06 and less than or equal to 0.22.

Preferably, the focal length f2 of the second lens element, the radius of curvature of the image-side surface of the second lens element is R4, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: f2/f is not less than 4.68 and not more than-0.79; -1.83 ≤ (R3+ R4)/(R3-R4) 0.82; d3/TTL is more than or equal to 0.03 and less than or equal to 0.13.

Preferably, the on-axis thickness of the third lens is d5, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: d5/TTL is more than or equal to 0.03 and less than or equal to 0.09.

Preferably, the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: f4/f is more than or equal to 0.37 and less than or equal to 1.64; d7/TTL is more than or equal to 0.06 and less than or equal to 0.26.

Preferably, the focal length of the fifth lens is f5, the on-axis thickness of the fifth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied: f5/f is more than or equal to-1.34 and less than or equal to-0.39; (R9+ R10)/(R9-R10) is not more than 0.59 but not more than 3.00; d9/TTL is more than or equal to 0.04 and less than or equal to 0.28.

Preferably, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, and the following relationship is satisfied: TTL/IH is less than or equal to 1.34.

Preferably, the field angle of the imaging optical lens is FOV, and satisfies the following relation: the FOV is more than or equal to 85 degrees.

Preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied: f12/f is more than or equal to 0.56 and less than or equal to 1.87.

The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical performance, and has characteristics of a wide angle and an ultra-thin profile, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are constituted by imaging elements such as a CCD and a CMOS for high pixel.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment;

fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in fig. 1;

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

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

fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment;

fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 5;

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

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

fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment;

fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;

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

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

fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment;

fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;

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

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

[ detailed description ] embodiments

The invention is further described with reference to the following figures and embodiments.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.

(embodiment I)

Referring to fig. 1 to 4, an imaging optical lens 10 according to a first embodiment of the present invention is provided. In fig. 1, the left side is an object side, the right side is an image side, and the imaging optical lens assembly 10 mainly includes five lenses, namely, an aperture stop S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the object side to the image side. A glass flat GF is disposed between the fifth lens L5 and the image plane Si, and the glass flat GF may be a glass cover plate or an optical filter.

The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power and the fifth lens element L5 with negative refractive power.

Here, it is defined that a focal length of the first lens L1 is f1, a focal length of the entire imaging optical lens 10 is f, a focal length of the third lens L3 is f3, a radius of curvature of an object-side surface of the third lens L3 is R5, a radius of curvature of an image-side surface of the third lens L3 is R6, a radius of curvature of an object-side surface of the fifth lens L5 is R9, a radius of curvature of an image-side surface of the fifth lens L5 is R10, a radius of curvature of an image-side surface of the second lens L2 is R3, an on-axis thickness of the second lens L2 is d3, an on-axis thickness of the first lens L1 is d1, an on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 is d2, and the following relational expressions are satisfied:

0.65≤f1/f≤0.80； (1)

3.00≤(R5+R6)/(R5-R6)≤20.00； (2)

-20.00≤f3/f≤-8.00； (3)

10.00≤d1/d2≤15.00； (4)

3.00≤R9/R10≤12.00； (5)

-100.00≤R3/d3≤-15.00。 (6)

wherein, the conditional expression (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 the field curvature of the system.

The conditional expression (2) specifies the shape of the third lens, and within the range specified by the conditional expression, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, 3.01 ≦ (R5+ R6)/(R5-R6). ltoreq.19.97.

Conditional expression (3) specifies the ratio of the focal length of the third lens to the total focal length of the system, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths.

The conditional expression (4) specifies the ratio of the thickness of the first lens to the air space of the first and second lenses, and contributes to the total length of the optical system to be reduced within the range of the conditional expression, thereby achieving the effect of making the optical system ultra-thin.

The conditional expression (5) specifies the shape of the fifth lens, and in this range, it is advantageous to correct the aberration of the off-axis view angle as the ultra-thin and wide-angle lens progresses. Preferably, 3.00 ≦ R9/R10 ≦ 11.99.

Conditional expression (6) specifies the ratio of the second lens object side radius of curvature to the second lens thickness, and contributes to the improvement of the optical system performance within the range of the conditional expression. Preferably-99.91. ltoreq.R 3/d 3. ltoreq.15.02.

In the present embodiment, the curvature radius of the object-side surface of the fourth lens L4 is R7, the curvature radius of the image-side surface of the fourth lens L4 is R8, and the following relational expressions are satisfied: 2.00 is less than or equal to

(R7+ R8)/(R7-R8) is not more than 5.00, and the shape of the fourth lens L4 is defined, and when the shape is within this range, it is advantageous to correct the aberration of the off-axis angle with the development of an ultra-thin wide angle.

In the present embodiment, the radius of curvature of the object-side surface of the first lens L1 is R1, the radius of curvature of the image-side surface of the first lens L1 is R2, and the following relational expressions are satisfied: -1.99 ≦ (R1+ R2)/(R1-R2) ≦ -0.39, and the shape of the first lens is controlled appropriately so that the first lens can effectively correct the system spherical aberration. Preferably, the following relation is satisfied: -1.24 ≤ (R1+ R2)/(R1-R2) ≤ 0.49.

The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.06 and less than or equal to 0.22, and ultra-thinning is facilitated. Preferably, 0.09. ltoreq. d 1/TTL. ltoreq.0.17.

In the present embodiment, the focal length of the entire imaging optical lens 10 is f, the focal length of the second lens L2 is f2, and the following relational expression is satisfied: 4.68 f2/f 0.79, and is advantageous for correcting aberrations of the optical system by controlling the negative power of the second lens L2 within a reasonable range. Preferably-2.92. ltoreq. f 2/f. ltoreq-0.98.

The curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, and the following relations are satisfied: the shape of the second lens L2 is defined to be (R3+ R4)/(R3-R4) to be (1.83) or more and (R3+ R4) or less and (0.82) or less, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is brought to a super-thin wide angle within the range. Preferably, -1.14 ≦ (R3+ R4)/(R3-R4). ltoreq.0.66.

The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 3/TTL. ltoreq.0.10.

In the present embodiment, the on-axis thickness of the third lens L3 is d5, and the following relational expression is satisfied: d5/TTL is more than or equal to 0.03 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.07.

In the present embodiment, the focal length of the fourth lens L4 is f4, and the focal length of the entire imaging optical lens 10 is f, and the following relational expression is satisfied: f4/f is more than or equal to 0.37 and less than or equal to 1.64, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, the following relation is satisfied: f4/f is more than or equal to 0.59 and less than or equal to 1.31.

The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.06 and less than or equal to 0.26, and ultra-thinning is facilitated. Preferably, 0.09. ltoreq. d 7/TTL. ltoreq.0.21.

The focal length f5 of the fifth lens L5 satisfies the following relation: f5/f is less than or equal to-0.41, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably-1.36. ltoreq. f 5/f. ltoreq-0.51.

The curvature radius of the object side surface of the fifth lens L5 is R9, the curvature radius of the image side surface of the fifth lens L5 is R10, and the following relations are satisfied: the shape of the fifth lens L5 is defined to be not less than 0.59 and not more than (R9+ R10)/(R9-R10) and not more than 3.00, and when the shape is within the range, the aberration of the off-axis picture angle is favorably corrected with the development of ultra-thin and wide-angle. Preferably, 0.95 ≦ (R9+ R10)/(R9-R10). ltoreq.2.40.

The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.04 and less than or equal to 0.28, and ultra-thinning is facilitated. Preferably, 0.07 ≦ d9/TTL ≦ 0.22.

In the present embodiment, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, and the following relationship is satisfied: TTL/IH is less than or equal to 1.34, so that ultra-thinning can be realized.

In the present embodiment, the angle of view of the imaging optical lens 10 is 85 ° or more, and the imaging optical lens is widened.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.55 or less, thereby realizing a large aperture.

In the present embodiment, the combined focal length of the first lens and the second lens of the imaging optical lens 10 is f12, and the following relational expression is satisfied: f12/f is more than or equal to 0.56 and less than or equal to 1.87. Within the range of the conditional expressions, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, thereby maintaining the miniaturization of the image lens system. Preferably, 0.89. ltoreq. f 12/f. ltoreq.1.49 is satisfied.

When the focal length of the image pickup optical lens 10, the focal length of each lens and the curvature radius satisfy the above relational expression, the image pickup optical lens 10 can have good optical performance, and design requirements of a large aperture, a wide angle and ultra-thinness can be satisfied; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.

In this way, the imaging optical lens 10 can satisfy design requirements of a large aperture, a wide angle, and an ultra-thin structure while having good optical imaging performance.

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

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

preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.

The following shows design data of the image pickup optical lens 10 shown in fig. 1.

Table 1 shows the object-side and image-side radii of curvature R, the on-axis thicknesses of the respective lenses, the distances d between the adjacent lenses, the refractive indices nd, and the abbe numbers ν d of the first lens L1 to the fifth lens L5 constituting the imaging optical lens 10 according to the first embodiment of the present invention. In the present embodiment, R and d are both expressed in units of 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 and the radius of curvature of the lens as the center;

s1: an aperture;

r1 radius of curvature of object-side surface of first lens L1;

r2 radius of curvature of image side surface of first lens L1;

r3 radius of curvature of object-side surface of second lens L2;

r4 radius of curvature of the image-side surface of the second lens L2;

r5 radius of curvature of object-side surface of third lens L3;

r6 radius of curvature of the image-side surface of the third lens L3;

r7 radius of curvature of object-side surface of fourth lens L4;

r8 radius of curvature of image side surface of the fourth lens L4;

r9 radius of curvature of object-side surface of fifth lens L5;

r10 radius of curvature of the image-side surface of the fifth lens L5;

r11 radius of curvature of object side of glass plate GF;

r12 radius of curvature of image side of glass plate GF;

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

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

d 1: the on-axis thickness of the first lens L1;

d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d 3: the on-axis thickness of the second lens L2;

d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d 5: the on-axis thickness of the third lens L3;

d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d 7: the on-axis thickness of the fourth lens L4;

d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;

d 9: the on-axis thickness of the fifth lens L5;

d 10: the on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the glass plate GF;

d 11: on-axis thickness of glass flat GF;

d 12: the axial distance from the image side surface of the glass flat GF to the image surface Si;

nd: a refractive index;

nd 1: the refractive index of the first lens L1;

nd 2: the refractive index of the second lens L2;

nd 3: refractive index of the third lens L3;

nd 4: refractive index of the fourth lens L4;

nd 5: the refractive index of the fifth lens L5;

ndg: refractive index of glass plate GF;

vd is Abbe number;

v 1: abbe number of the first lens L1;

v 2: abbe number of the second lens L2;

v 3: abbe number of the third lens L3;

v 4: abbe number of the fourth lens L4;

v 5: abbe number of the fifth lens L5;

vg: abbe number of glass sheet 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, a20 are aspherical coefficients.

IH image height

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶+A18x¹⁸+A20x²⁰(1)

For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).

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

[ TABLE 3 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	0.685
P1R2	0
				P2R1	1	0.275
P2R2	0
				P3R1	1	0.235
P3R2	2	0.315	0.905
				P4R1	1	0.875
P4R2	2	0.925	1.345
				P5R1	2	0.235	1.445
P5R2	2	0.505	2.415

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	1	0.465
P2R2	0
			P3R1	1	0.405
P3R2	1	0.545
			P4R1	0
P4R2	0
			P5R1	1	0.445
P5R2	1	1.345

Table 17 below also lists values corresponding to various parameters in the first embodiment and the parameters specified in the conditional expressions.

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm, respectively, passing through the imaging optical lens 10. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10. The field curvature S in fig. 4 is a field curvature in the sagittal direction, and T is a field curvature in the meridional direction.

In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 1.403mm, a full field image height of 3.282mm, a diagonal field angle of 85.00 °, a wide angle, and a thin profile, and has excellent optical characteristics.

(second embodiment)

Fig. 5 is a schematic structural diagram of the image pickup optical lens 20 in the second embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.

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 aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[ TABLE 6 ]

Tables 7 and 8 show the inflected point and stagnation point design data of each lens in the imaging optical lens 20.

[ TABLE 7 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	0
P1R2	0
					P2R1	1	0.665
P2R2	0
					P3R1	1	0.375
P3R2	2	0.495	1.085
					P4R1	1	1.165
P4R2	3	0.995	1.365	1.555
					P5R1	3	0.325	1.215	1.935
P5R2	1	0.475

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	0
P2R2	0
			P3R1	1	0.605
P3R2	1	0.825
			P4R1	0
P4R2	0
			P5R1	1	0.585
P5R2	1	1.355

Table 17 below also lists values corresponding to various parameters in embodiment two and the parameters specified in the conditional expressions.

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm passing through the imaging optical lens 20, respectively. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 20. The field curvature S in fig. 8 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.

In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter of 1.402mm, a full field image height of 3.282mm, a diagonal field angle of 85.00 °, a wide angle, and a thin profile, and has excellent optical characteristics.

(third embodiment)

Fig. 9 is a schematic structural diagram of an imaging optical lens 30 in the third embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.

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

[ TABLE 9 ]

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

[ TABLE 10 ]

Tables 11 and 12 show the inflected point and stagnation point design data of each lens in the imaging optical lens 30.

[ TABLE 11 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curve3
					P1R1	1	0.655
P1R2	0
					P2R1	1	0.255
P2R2	0
					P3R1	1	0.105
P3R2	2	0.175	0.845
					P4R1	3	0.805	1.085	1.185
P4R2	2	0.905	1.315
					P5R1	3	0.245	1.475	2.255
P5R2	1	0.515

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	1	0.485
P2R2	0
			P3R1	1	0.165
P3R2	1	0.285
			P4R1	0
P4R2	0
			P5R1	1	0.465
P5R2	1	1.495

Table 17 below also lists values corresponding to various parameters in the third embodiment and the parameters specified in the conditional expressions.

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm, respectively, passing through the imaging optical lens 30. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 30. The field curvature S in fig. 12 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.

In the present embodiment, the imaging optical lens 30 has an entrance pupil diameter of 1.402mm, a full field image height of 3.282mm, a diagonal field angle of 85.00 °, a wide angle, and a thin profile, and has excellent optical characteristics.

(fourth embodiment)

Fig. 13 is a schematic structural diagram of an image pickup optical lens 40 in a fourth embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not repeated herein, and only different points are listed below.

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

[ TABLE 13 ]

[ TABLE 14 ]

Tables 15 and 16 show the inflected point and stagnation point design data of each lens in the imaging optical lens 30.

[ TABLE 15 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	0.555
P1R2	0
				P2R1	1	0.245
P2R2	0
				P3R1	1	0.295
P3R2	1	0.455
				P4R1	2	0.585	0.865
P4R2	1	0.765
				P5R1	2	0.265	1.495
P5R2	2	0.665	2.525

[ TABLE 16 ]

Fig. 13 and 14 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm, respectively, passing through the imaging optical lens 40. Fig. 15 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 40. The field curvature S in fig. 16 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.

In the present embodiment, the imaging optical lens 40 has an entrance pupil diameter of 1.403mm, a full field image height of 3.282mm, a diagonal field angle of 85.00 °, a wide angle, and a thin profile, and has excellent optical characteristics.

Table 17 below lists values of the conditional expressions in the first embodiment, the second embodiment, and the third embodiment, and values of other relevant parameters, based on the conditional expressions.

[ TABLE 17 ]

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

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 first lens element is f1, a focal length of the entire image pickup optical lens assembly is f, a focal length of the third lens element is f3, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of an image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the second lens element is R3, an on-axis thickness of the second lens element is d3, an on-axis thickness of the first lens element is d1, an on-axis distance from the image-side surface of the first lens element to the object-side surface of the second lens element is d2, and the following relationships are satisfied:

0.65≤f1/f≤0.80；

3.00≤(R5+R6)/(R5-R6)≤20.00；

-20.00≤f3/f≤-8.00；

10.00≤d1/d2≤15.00；

3.00≤R9/R10≤12.00；

-100.00≤R3/d3≤-15.00。

2. the imaging optical lens according to claim 1, wherein a radius of curvature of an object-side surface of the fourth lens element is R7, a radius of curvature of an image-side surface of the fourth lens element is R8, and the following relational expressions are satisfied:

2.00≤(R7+R8)/(R7-R8)≤5.00。

3. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

-1.99≤(R1+R2)/(R1-R2)≤-0.39；

0.06≤d1/TTL≤0.22。

4. the imaging optical lens of claim 1, wherein the focal length f2 of the second lens, the radius of curvature of the image-side surface of the second lens is R4, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

-4.68≤f2/f≤-0.79；

-1.83≤(R3+R4)/(R3-R4)≤0.82；

0.03≤d3/TTL≤0.13。

5. a photographic optical lens according to claim 1, wherein the on-axis thickness of the third lens element is d5, the total optical length of the photographic optical lens is TTL, and the following relationship is satisfied:

0.03≤d5/TTL≤0.09。

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:

0.37≤f4/f≤1.64；

0.06≤d7/TTL≤0.26。

7. the image-capturing optical lens of claim 1, wherein the focal length of the fifth lens element is f5, the on-axis thickness of the fifth lens element is d9, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:

-2.17≤f5/f≤-0.41；

0.59≤(R9+R10)/(R9-R10)≤3.00；

0.04≤d9/TTL≤0.28。

8. 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 is less than or equal to 1.34.

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≥85°。

10. 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:

0.56≤f12/f≤1.87。