CN110989134B - Image pickup optical lens - Google Patents

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the following relation is satisfied: f1/f is more than or equal to 0.30 and less than or equal to 0.50; f2/f is more than or equal to-0.80 and less than or equal to-0.40; d1/d2 is more than or equal to 40.00 and less than or equal to 50.00; d4/d5 is more than or equal to 1.80 and less than or equal to 2.24. The photographic optical lens can achieve high imaging performance and meet the design requirements of large aperture, wide angle and ultra-thinness.

Description

Image pickup optical lens

Technical Field

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

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 a three-piece or four-piece lens structure. Moreover, 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 on the imaging quality is continuously improved, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. However, since the conventional configuration of power distribution and insufficient setting of lens thickness and shape cause a problem of insufficient telephoto length of the lens, there is a strong demand for a telephoto imaging lens having excellent optical characteristics, being ultra-thin, and sufficiently correcting chromatic aberration.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of ultra-thinning and telephoto while achieving high imaging performance.

To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens, a second lens, a third lens, a fourth lens and a fifth lens;

the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the image pickup optical lens is f, the on-axis thickness of the first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, and the on-axis distance of the third lens is d5, so that the following relational expressions are satisfied:

0.30≤f1/f≤0.50；

-0.80≤f2/f≤-0.40；

40.00≤d1/d2≤50.00；

1.80≤d4/d5≤2.24。

preferably, the radius of curvature of the object-side surface of the fifth lens element is R9, and the radius of curvature of the image-side surface of the fifth lens element is R10, which satisfy the following relationships:

2.00≤(R9+R10)/(R9-R10)≤5.00。

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:

-2.42≤(R1+R2)/(R1-R2)≤-0.29；

0.09≤d1/TTL≤0.30。

preferably, the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, the on-axis thickness of the third lens element is d3, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:

-1.13≤(R3+R4)/(R3-R4)≤1.38；

0.01≤d3/TTL≤0.07。

preferably, the focal length of the third lens element is f3, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:

-3.21≤f3/f≤2.14；

-7.53≤(R5+R6)/(R5-R6)≤4.69；

0.02≤d5/TTL≤0.07。

preferably, the focal length of the fourth lens element is f4, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:

0.53≤f4/f≤2.22；

1.27≤(R7+R8)/(R7-R8)≤9.65；

0.02≤d7/TTL≤0.12。

preferably, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens assembly is TTL, and the following relationships are satisfied:

-3.10≤f5/f≤-0.37；

0.01≤d9/TTL≤0.06。

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 TTL/IH is less than or equal to 5.1.

Preferably, the total optical length of the image pickup optical lens is TTL, and f/TTL is more than 1.1.

Preferably, the F-number of the imaging optical lens is less than or equal to 3.50.

The invention has the beneficial effects that: the pick-up optical lens has good optical performance, has the characteristics of large aperture, long focus and ultra-thin, and is particularly suitable for a mobile phone pick-up lens assembly and a WEB pick-up lens which are composed of pick-up elements such as CCD and CMOS for high pixel.

Drawings

Fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment of the present invention;

FIG. 2 is a schematic axial aberration diagram of the imaging optical lens of 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 of FIG. 1;

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

FIG. 6 is a schematic axial aberration diagram of the imaging optical lens of 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 of FIG. 5;

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

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.

Detailed Description

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.

(first embodiment)

Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes five lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. An optical element such as an optical filter (filter) GF may be disposed between the fifth lens L5 and the image plane Si.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic materials.

Defining the focal length of the first lens L1 as f1, the focal length of the whole shooting optical lens 10 as f, and f1/f is more than or equal to 0.30 and less than or equal to 0.50, and defining the ratio of the focal length of the first lens L1 to the system focal length, is favorable for improving the optical system performance within the conditional expression range. Preferably, 0.33. ltoreq. f 1/f. ltoreq.0.50 is satisfied.

Defining the focal length of the second lens L2 as f2, the focal length of the whole shooting optical lens 10 as f, wherein f2/f is more than or equal to-0.80 and less than or equal to-0.40, and when f2/f meets the above conditions, the focal power of the second lens L2 can be effectively distributed to correct the aberration of the optical system, so as to improve the imaging quality. Preferably, -0.78. ltoreq. f 2/f. ltoreq-0.50.

The on-axis thickness of the first lens L1 is defined as d1, the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 is defined as d2, and the distance d1/d2 is not less than 40.00 and not more than 50.00, so that when the distance d1/d2 meets the conditions, the aberration correction is facilitated, and the imaging quality is improved. Preferably, 40.16. ltoreq. d1/d 2. ltoreq.50.00.

The axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 is defined as d4, the axial distance of the third lens L3 is defined as d5, 1.80 is not less than d4/d5 is not more than 2.24, the ratio of the air spacing distance between the second lens L2 and the third lens L3 to the thickness of the third lens L3 is defined, and the processing of the lens and the assembly of the lens are facilitated within the scope of the conditional expressions. Preferably, 1.81. ltoreq. d4/d 5. ltoreq.2.24.

The curvature radius of the object side surface of the fifth lens L5 is defined as R9, the curvature radius of the image side surface of the fifth lens L5 is defined as R10, 2.00 ≦ (R9+ R10)/(R9-R10) ≦ 5.00, and the shape of the fifth lens L5 is defined, so that the deflection degree of light rays passing through the lens can be alleviated and the phase difference can be effectively reduced within the range defined by the conditional expression. Preferably, 2.10 ≦ (R9+ R10)/(R9-R10). ltoreq.5.00.

And defining the total optical length of the image pickup optical lens as TTL.

When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.

In this embodiment, the object-side surface of the first lens element L1 is convex at the paraxial region and has positive refractive power.

The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relations: 2.42 ≦ (R1+ R2)/(R1-R2) ≦ -0.29, the shape of the first lens is controlled appropriately so that the first lens can correct the system spherical aberration effectively; preferably, -1.51 ≦ (R1+ R2)/(R1-R2) ≦ -0.36.

The first lens L1 has an on-axis thickness d1, and satisfies the following relationship: d1/TTL is more than or equal to 0.09 and less than or equal to 0.30, and ultra-thinning is facilitated. Preferably, 0.14. ltoreq. d 1/TTL. ltoreq.0.24.

In this embodiment, the object-side surface of the second lens element L2 is concave in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has positive refractive power.

The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: -1.13 ≦ (R3+ R4)/(R3-R4) ≦ 1.38, defines the shape of the second lens L2, and is advantageous for correcting the chromatic aberration on the axis when within the range. Preferably, -0.71 ≦ (R3+ R4)/(R3-R4). ltoreq.1.10.

The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.01 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 3/TTL. ltoreq.0.05.

In the present embodiment, the image-side surface of the third lens L3 is concave in the paraxial region.

The focal length of the entire image pickup optical lens 10 is f, the focal length of the third lens L3 is f3, and the following relationships are satisfied: 3.21 ≦ f3/f ≦ 2.14, which allows better imaging quality and lower sensitivity of the system by a reasonable distribution of the powers. Preferably, -2.01. ltoreq. f 3/f. ltoreq.1.71.

The curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relations: 7.53 ≦ (R5+ R6)/(R5-R6) ≦ 4.69, and defines the shape of the third lens, and within the range defined by the conditional expression, the degree of deflection of the light rays passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, -4.71 ≦ (R5+ R6)/(R5-R6). ltoreq.3.75.

The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 5/TTL. ltoreq.0.06.

In this embodiment, the object-side surface of the fourth lens element L4 is concave in the paraxial region thereof, and the image-side surface thereof is convex in the paraxial region thereof, and has positive refractive power.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fourth lens L4 is f4, and the following relations are satisfied: f4/f is more than or equal to 0.53 and less than or equal to 2.22, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.84. ltoreq. f 4/f. ltoreq.1.77.

The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relations: 1.27 ≦ (R7+ R8)/(R7-R8) ≦ 9.65, and the shape of the fourth lens L4 is specified, and when within the range, it is advantageous to correct the problems such as the aberration of the off-axis view angle. Preferably, 2.04 ≦ (R7+ R8)/(R7-R8). ltoreq.7.72.

The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.02 and less than or equal to 0.12, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.10.

In this embodiment, the object-side surface of the fifth lens element L5 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has negative refractive power.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fifth lens L5 is f5, and the following relations are satisfied: f5/f is less than or equal to-0.37, 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, -1.94. ltoreq. f 5/f. ltoreq-0.47.

The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.01 and less than or equal to 0.06, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 9/TTL. ltoreq.0.05.

In the present embodiment, the focal length of the entire imaging optical lens 10 is f, the combined focal length of the first lens and the second lens is f12, and the following relational expression is satisfied: f12/f is more than or equal to 0.30 and less than or equal to 1.36. Therefore, the aberration and distortion of the shooting optical lens can be eliminated, the back focal length of the shooting optical lens can be suppressed, and the miniaturization of the image lens system group is maintained. Preferably, 0.47. ltoreq. f 12/f. ltoreq.1.09.

The image height of the image pickup optical lens is defined as IH, and TTL/IH is less than or equal to 5.1 mm in the embodiment, so that ultra-thinning is facilitated.

In this embodiment, the focal length of the entire image pickup optical lens 10 is f, the total optical length of the image pickup optical lens 10 is TTL, and f/TTL is greater than 1.1, which is beneficial to achieving a long focal length.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 3.50 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 3.43 or less.

With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.

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 is the total optical length of the camera optical lens, and the unit is 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.

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

[ TABLE 1 ]

Wherein each symbol has the following meaning.

S1: an aperture;

r: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;

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 surface of the fourth lens L4;

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

r9: a radius of curvature of the object side surface of the fifth lens L5;

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

r11: radius of curvature of the object side of the optical filter GF;

r12: the radius of curvature of the image-side surface of the optical filter GF;

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

d 0: the on-axis distance of 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: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;

d 11: on-axis thickness of the optical filter GF;

d 12: the on-axis distance from the image side surface of the optical filter GF to the image surface;

nd: the refractive index of the d-line;

nd 1: the refractive index of the d-line of the first lens L1;

nd 2: the refractive index of the d-line of the second lens L2;

nd 3: the refractive index of the d-line of the third lens L3;

nd 4: the refractive index of the d-line of the fourth lens L4;

nd 5: the refractive index of the d-line of the fifth lens L5;

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

vd: an 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 the optical filter 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 ]

Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.

IH image height

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶ (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 first embodiment of the present invention. P1R1 and P1R2 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, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, and 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 ]

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1
			P1R1
P1R2
			P2R1	1	0.885
P2R2
			P3R1
P3R2
			P4R1
P4R2
			P5R1	1	0.435
P5R2	1	0.765

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650.0nm, 610.0nm, 555.0nm, 510.0nm, and 470.0nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555.0nm after passing through the imaging optical lens 10 according to the first embodiment, where S in fig. 4 is curvature of field in the sagittal direction, and T is curvature of field in the tangential direction.

Table 13 shown later shows values of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.

As shown in table 13, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.247mm, a full field image height of 2.502mm, a diagonal field angle of 19.49 °, a long focal length, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(second embodiment)

The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described 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 inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[ TABLE 7 ]

	Number of points of inflection	Position of reverse curvature 1
			P1R1
P1R2
			P2R1	1	0.495
P2R2
			P3R1	1	0.625
P3R2
			P4R1
P4R2
			P5R1	1	0.375
P5R2	1	0.555

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1
			P1R1
P1R2
			P2R1	1	0.975
P2R2
			P3R1	1	1.085
P3R2
			P4R1
P4R2
			P5R1	1	0.675
P5R2	1	1.085

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650.0nm, 610.0nm, 555.0nm, 510.0nm, and 470.0nm passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555.0nm after passing through the imaging optical lens 20 according to the second embodiment.

As shown in table 13, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.118mm, a full field image height of 2.502mm, a diagonal field angle of 19.99 °, a long focal length, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(third embodiment)

The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described 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 inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 11 ]

	Number of points of inflection	Position of reverse curvature 1
			P1R1
P1R2	1	1.455
			P2R1	1	0.265
P2R2
			P3R1
P3R2	1	0.585
			P4R1
P4R2
			P5R1	1	0.255
P5R2	1	0.495

[ TABLE 12 ]

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650.0nm, 610.0nm, 555.0nm, 510.0nm, and 470.0nm passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555.0nm after passing through the imaging optical lens 30 according to the third embodiment.

Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.118mm, a full field image height of 2.502mm, a diagonal field angle of 20.04 °, a long focal length, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 13 ]

Parameter and condition formula	Example 1	Example 2	Example 3
				f	14.440	14.000	14.000
f1	5.708	4.900	6.860
				f2	-8.776	-8.701	-10.640
f3	-23.182	-9.109	20.001
				f4	15.218	15.359	20.684
f5	-13.427	-21.689	-7.828
				f12	10.566	8.301	12.691
FNO	3.40	3.40	3.40
				f1/f	0.40	0.35	0.49
f2/f	-0.61	-0.62	-0.76
				d1/d2	45.96	50.00	40.32
d4/d5	2.23	1.81	1.91

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (10)

1. An imaging optical lens system comprising five lens elements, 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, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;

the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the imaging optical lens is f, the focal length of the third lens is f3, the on-axis thickness of the first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, the on-axis distance of the third lens is d5, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius of the image side surface of the fourth lens is R8, and the following relational expressions are satisfied:

0.30≤f1/f≤0.50；

-0.80≤f2/f≤-0.40；

-3.21≤f3/f≤2.14；

40.00≤d1/d2≤50.00；

1.80≤d4/d5≤2.24；

1.27≤(R7+R8)/(R7-R8)≤9.65。

2. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the fifth lens element is R9, and the radius of curvature of the image-side surface of the fifth lens element is R10, satisfying the following relationship:

2.00≤(R9+R10)/(R9-R10)≤5.00。

3. the imaging optical lens according to claim 1,

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 total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:

-2.42≤(R1+R2)/(R1-R2)≤-0.29；

0.09≤d1/TTL≤0.30。

4. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the on-axis thickness of the third lens element is d3, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:

-1.13≤(R3+R4)/(R3-R4)≤1.38；

0.01≤d3/TTL≤0.07。

5. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:

-7.53≤(R5+R6)/(R5-R6)≤4.69；

0.02≤d5/TTL≤0.07。

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:

0.53≤f4/f≤2.22；

0.02≤d7/TTL≤0.12。

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

-3.10≤f5/f≤-0.37；

0.01≤d9/TTL≤0.06。

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 TTL/IH is less than or equal to 5.1.

9. A camera optical lens according to claim 1, characterized in that the total optical length of the camera optical lens is TTL, f/TTL > 1.1.

10. The imaging optical lens according to claim 1, characterized in that an aperture F-number of the imaging optical lens is less than or equal to 3.50.

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