CN116482834A

CN116482834A - Image capturing lens

Info

Publication number: CN116482834A
Application number: CN202310551054.6A
Authority: CN
Inventors: 刘权辉
Original assignee: Luxvisions Innovation Ltd
Current assignee: Luxvisions Innovation Ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-07-25

Abstract

An image capturing lens includes, in order from an object side to an image side along an optical axis, first to fifth lenses having positive diopter, negative diopter, positive diopter, and negative diopter, respectively. The image capturing lens has five lenses with diopters, wherein the first lens to the fifth lens are aspheric lenses, the image capturing lens executes focusing travel by moving the fifth lens, and the condition 2.5< |f2/f3| <5.5 is satisfied, wherein f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

Description

Image capturing lens

Technical Field

The present disclosure relates to optical devices, and particularly to an imaging lens.

Background

The specifications of portable electronic devices are changing day by day, and optical imaging lenses, which are one of the key components, are also being developed in a more diversified manner. For the image capturing lens of the portable electronic device, not only a larger aperture is required and a shorter total lens length is maintained, but also higher pixels and higher resolution are required. In order to meet various design requirements, the image capturing lens often includes a plurality of lenses, and the focusing process may change the total length of the lens, which is unfavorable for being configured on a thin portable electronic device.

Disclosure of Invention

The invention provides an image capturing lens, which does not change the total length of the lens in the focusing process and is suitable for being configured on a thin portable electronic device.

According to an embodiment of the present invention, there is provided an image capturing lens including, in order from an object side to an image side along an optical axis, first to fifth lenses having positive diopter, negative diopter, positive diopter, and negative diopter, respectively. The image capturing lens has five lenses with diopters, wherein the first lens to the fifth lens are aspheric lenses, the image capturing lens executes focusing travel by moving the fifth lens, and the condition 2.5< |f2/f3| <5.5 is satisfied, wherein f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

Based on the above, the image capturing lens provided in the embodiment of the invention performs the focusing stroke by moving the fifth lens, and the total lens length of the image capturing lens is kept fixed during focusing, so that the image capturing lens is suitable for being configured on a thin portable electronic device, and particularly can be used as a front lens of the portable electronic device.

In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A shows a schematic view of an imaging lens according to a first embodiment of the present invention. Fig. 1B and fig. 1C are schematic field diagrams of an imaging lens according to a first embodiment, and fig. 1D is a schematic distortion diagram of the imaging lens according to the first embodiment;

fig. 2A shows a schematic view of an imaging lens according to a second embodiment of the present invention. Fig. 2B and fig. 2C are schematic field diagrams of an imaging lens according to a second embodiment, and fig. 2D is a schematic distortion diagram of the imaging lens according to the second embodiment;

fig. 3A shows a schematic view of an imaging lens according to a third embodiment of the present invention. Fig. 3B and 3C are schematic field diagrams of an imaging lens according to a third embodiment, and fig. 3D is a schematic distortion diagram of the imaging lens according to the third embodiment.

Reference numerals illustrate:

0, an aperture;

1. 2, 3, 4 and 5, lenses;

8, a light filter;

10, an image capturing lens;

15. 25, 35, 45, 55, 85 object side surfaces;

16. 26, 36, 46, 56, 86;

99, imaging surface;

a1, an object side;

a2, an image side;

and I, optical axis.

Detailed Description

Referring to fig. 1A, a schematic diagram of an imaging lens according to a first embodiment of the present invention is shown. The image capturing lens 10 of the first embodiment of the present invention includes, in order from an object side A1 to an image side A2, an aperture stop 0, lenses 1 to 5, and a filter 8 along an optical axis I of the image capturing lens 10. When light emitted from an object to be photographed enters the image capturing lens 10 and sequentially passes through the aperture 0, the lens 1, the lens 2, the lens 3, the lens 4, the lens 5 and the filter 8, an image is formed on the image plane 99. The filter 8 is, for example, an infrared cut-off filter (ir cut-off filter) that can pass light having a suitable wavelength (for example, ir or visible light) and filter out the ir band to be filtered. The filter 8 is disposed between the lens 5 and the imaging surface 99. It is added that the object side A1 is a side toward the object to be photographed, and the image side A2 is a side toward the imaging plane 99.

In the present embodiment, the lenses 1, 2, 3, 4, 5 and 8 of the imaging lens 10 each have object sides 15, 25, 35, 45, 55, 85 facing the object side A1 and passing imaging light, and image sides 16, 26, 36, 46, 56, 86 facing the image side A2 and passing imaging light. In the present embodiment, the aperture 0 is disposed on the object side A1 of the lens 1.

The lens 1 has positive refractive power (positive refracting power), the object-side surface 15 has a convex optical axis region, the image-side surface 16 has a convex optical axis region, and both the object-side surface 15 and the image-side surface 16 are aspheric.

The lens 2 has positive diopter, the optical axis area of the object side surface 25 is convex, the optical axis area of the image side surface 26 is convex, and both the object side surface 25 and the image side surface 26 are aspheric.

The lens element 3 has a negative refractive power (negative refracting power), wherein an optical axis region of the object-side surface 35 is concave, an optical axis region of the image-side surface 36 is concave, and both the object-side surface 35 and the image-side surface 36 are aspheric.

The lens element 4 has positive refractive power, wherein an optical axis region of the object-side surface 45 is convex, an optical axis region of the image-side surface 46 is convex, and both the object-side surface 45 and the image-side surface 46 are aspheric.

The lens element 5 has negative refractive power, wherein an optical axis region of the object-side surface 55 is convex, an optical axis region of the image-side surface 56 is concave, and both the object-side surface 55 and the image-side surface 56 are aspheric.

Other detailed optical data of the first embodiment are shown in table one, where the image height (ImgH) is half of the diagonal of the imaging plane 99.

Table one:

in Table one, the distance between the object-side surfaces 15 (0.644 mm as shown in Table one) is the thickness of the lens element 1 on the optical axis I, the distance between the image-side surfaces 16 (0.247 mm as shown in Table one) is the distance between the image-side surfaces 16 of the lens element 1 and the object-side surfaces 25 of the lens element 2 on the optical axis I, i.e. the gap between the lens elements 1 and 2 on the optical axis I, and so on.

It should be noted that the image capturing lens 10 performs a focusing stroke by moving the lens 5 along the optical axis I between the lens 4 and the optical filter 8, and therefore, the total lens length of the image capturing lens 10 can be kept constant during the focusing stroke, so that the image capturing lens 10 is suitable for being disposed on a thin portable electronic device, and in particular, can be used as a front lens of the portable electronic device. However, the invention is not limited thereto, and the image capturing lens 10 can be used as a rear lens of a portable electronic device or disposed on other electronic devices.

It should be further noted that the column labeled a in table one represents the focusing range of the image capturing lens 10, specifically, the distance between the focusing range of the image capturing lens 10 and the object side surface 15 of the lens element 1. In this embodiment, the range of the a field is greater than or equal to 150mm. In other words, the focusing range of the imaging lens 10 is a range from 150mm to infinity from the object side surface 15 toward the object side A1 direction. Wherein, when the focusing position is the position 150mm away from the object side surface 15 of the lens 1 (i.e. when the a field is 150 mm), the gap between the lens 4 and the lens 5 on the optical axis I (i.e. the B field in table one) is 0.172mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e. the C field in table one) is 0.490mm. In contrast, when the focusing position is the position away from the object side surface 15 of the lens 1 by infinity (i.e. when the a field is infinity), the gap between the lens 4 and the lens 5 on the optical axis I (i.e. the B field in table one) is 0.100mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e. the C field in table one) is 0.562mm.

In the present embodiment, the object sides 15, 25, 35, 45, 55 of the lenses 1, 2, 3, 4, 5 and the image sides 16, 26, 36, 46, 56 of the lenses 1, 2, 3, 4, 5 are all aspheric surfaces, and these aspheric surfaces are defined by the following formula (1):

y: the distance of the point on the aspherical curve from the optical axis;

z: the aspheric depth, i.e. the vertical distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane tangent to the vertex on the aspheric surface optical axis;

r: radius of curvature of the lens surface;

k: a conic coefficient;

a _2i : the 2 i-th order aspheric coefficients.

The cone coefficient K and each aspheric coefficient in the above aspheric formula (1) are shown in table two. In table two, reference numeral 15 denotes an aspherical surface coefficient of the object side surface 15 of the lens 1, reference numeral 16 denotes an aspherical surface coefficient of the image side surface 16 of the lens 1, and the other reference numerals are the same.

And (II) table:

flour with a plurality of grooves	K	a ₄	a ₆	a ₈	a ₁₀
						15	0.00E+00	-2.67E-02	-8.46E-02	3.62E-02	2.56E-01
16	0.00E+00	-1.60E-01	-9.96E-02	-8.17E-02	0.00E+00
						25	0.00E+00	-2.05E-01	-5.30E-01	1.28E+00	-3.70E+00
26	0.00E+00	-4.22E-01	-1.24E-02	1.25E-02	5.94E-03
						35	0.00E+00	-3.34E-01	1.75E-01	-1.22E-02	7.92E-03
36	0.00E+00	-3.95E-01	3.54E-01	-5.06E-02	1.94E-02
						45	0.00E+00	-3.98E-01	3.22E-01	-5.09E-02	-1.83E-02
46	0.00E+00	1.45E-01	1.11E-01	-1.70E-01	-2.12E-01
						55	0.00E+00	-6.07E+00	-3.65E-01	-5.84E-01	1.28E-02
56	0.00E+00	-2.62E+01	-8.19E+00	9.98E-01	3.26E+00
						Flour with a plurality of grooves	a ₁₂	a ₁₄	a ₁₆	a ₁₈	a ₂₀
15	-9.30E-01	6.15E-01	-1.61E-01	0.00E+00	0.00E+00
						16	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
25	3.89E+00	-2.77E+00	1.71E+00	0.00E+00	0.00E+00
						26	2.98E-03	1.12E-03	2.76E-04	0.00E+00	0.00E+00
35	-7.82E-04	-2.80E-03	-1.18E-03	0.00E+00	0.00E+00
						36	-1.02E-02	-2.19E-03	4.75E-04	0.00E+00	0.00E+00
45	7.63E-03	9.62E-03	3.40E-03	3.83E-03	3.57E-03
						46	-5.08E-02	5.51E-02	6.05E-02	2.53E-02	4.91E-03
55	-1.26E-01	-2.00E-01	-2.09E-02	9.33E-02	4.83E-02
						56	4.12E-01	-1.57E+00	-1.58E+00	-6.70E-01	-1.40E-01

Referring again to fig. 1B to 1D, fig. 1B shows graphs of Field curvature (Field) aberrations in the meridian (Tangential) direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm respectively is incident on the imaging lens 10 of the first embodiment, fig. 1C shows graphs of Field curvature aberrations in the Sagittal (Sagittal) direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm respectively is incident on the imaging lens 10 of the first embodiment, and fig. 1D shows graphs of aberrations in the Sagittal (Sagittal) direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm respectively is incident on the imaging lens 10 of the first embodiment.

As shown in the field curvature aberration diagrams of fig. 1B and 1C, the field curvature aberration of five representative wavelengths within the entire field of view falls within ±0.10mm, which illustrates that the imaging lens 10 of the first embodiment of the present invention can effectively eliminate the field curvature aberration. As shown in the distortion graph of fig. 1D, the distortion aberration of the five representative wavelengths in the entire field of view is less than ±2%, which indicates that the imaging lens 10 of the first embodiment of the present invention has good imaging quality.

In order to fully illustrate the various embodiments of the invention, other embodiments of the invention are described below. It should be noted that the following embodiments use the element numbers and part of the content of the foregoing embodiments, where the same numbers are used to denote the same or similar elements, and descriptions of the same technical content are omitted. For the description of the omitted parts, reference is made to the foregoing embodiments, and the following embodiments are not repeated.

Referring to fig. 2A, a schematic diagram of an imaging lens according to a second embodiment of the present invention is shown. The image capturing lens 10 according to the second embodiment of the present invention includes, in order from an object side A1 to an image side A2, an aperture stop 0, lenses 1 to 5, and a filter 8 along an optical axis I of the image capturing lens 10. When light emitted from an object to be photographed enters the image capturing lens 10 and sequentially passes through the aperture 0, the lens 1, the lens 2, the lens 3, the lens 4, the lens 5 and the filter 8, an image is formed on the image plane 99.

The lens element 1 has positive refractive power, wherein an optical axis region of the object-side surface 15 is convex, an optical axis region of the image-side surface 16 is convex, and both the object-side surface 15 and the image-side surface 16 are aspheric.

The lens element 3 has negative refractive power, the object-side surface 35 has a concave optical axis region, the image-side surface 36 has a concave optical axis region, and both the object-side surface 35 and the image-side surface 36 are aspheric.

Other detailed optical data for the second embodiment are shown in table three, where the image height is half of the diagonal of the imaging plane 99.

Table three:

in Table three, the distance between the object-side surfaces 15 (0.630 mm as shown in Table three) is the thickness of the lens element 1 on the optical axis I, the distance between the image-side surfaces 16 (0.196 mm as shown in Table three) is the distance between the image-side surfaces 16 of the lens element 1 and the object-side surfaces 25 of the lens element 2 on the optical axis I, i.e. the gap between the lens elements 1 and 2 on the optical axis I, and so on.

The image capturing lens 10 performs a focusing stroke by moving the lens 5 along the optical axis I between the lens 4 and the optical filter 8, and thus, the total lens length of the image capturing lens 10 can be kept constant during the focusing stroke, so that the image capturing lens 10 is suitable for being disposed on a thin portable electronic device, and particularly can be used as a front lens of the portable electronic device. However, the invention is not limited thereto, and the image capturing lens 10 can be used as a rear lens of a portable electronic device or disposed on other electronic devices.

The column labeled a in table three represents the distance between the focusable range of the imaging lens 10 and the object side 15 of the lens 1. In this embodiment, the range of the a field is greater than or equal to 150mm. In other words, the focusing range of the imaging lens 10 is a range from 150mm to infinity from the object side surface 15 toward the object side A1 direction. Wherein, when the focusing position is the position 150mm away from the object side surface 15 of the lens 1 (i.e. when the a field is 150 mm), the gap between the lens 4 and the lens 5 on the optical axis I (i.e. the B field in table three) is 0.168mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e. the C field in table three) is 0.500mm. In contrast, when the focusing position is the position away from the object side surface 15 of the lens 1 by infinity (i.e. when the a field is infinity), the gap between the lens 4 and the lens 5 on the optical axis I (i.e. the B field in table three) is 0.100mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e. the C field in table three) is 0.568mm.

In the present embodiment, the object sides 15, 25, 35, 45, 55 of the lenses 1, 2, 3, 4, 5 and the image sides 16, 26, 36, 46, 56 of the lenses 1, 2, 3, 4, 5 are all aspheric, and the aspheric surfaces are defined by the above aspheric formula (1).

The cone coefficient K and each aspheric coefficient in the above aspheric formula (1) are shown in table four. In table four, the numeral 15 denotes an aspherical coefficient of the object side surface 15 of the lens 1, the numeral 16 denotes an aspherical coefficient of the image side surface 16 of the lens 1, and so on.

Table four:

flour with a plurality of grooves	K	a ₄	a ₆	a ₈	a ₁₀
						15	0.00E+00	-2.84E-02	-1.24E-01	1.87E-01	9.19E-03
16	0.00E+00	-1.96E-01	-1.08E-01	-1.43E-01	0.00E+00
						25	0.00E+00	-2.21E-01	-5.96E-01	1.19E+00	-3.71E+00
26	0.00E+00	-4.52E-01	-2.86E-02	1.29E-02	3.36E-03
						35	0.00E+00	-3.23E-01	1.59E-01	-1.03E-02	5.36E-03
36	0.00E+00	-4.63E-01	4.16E-01	-4.06E-02	2.86E-02
						45	0.00E+00	-4.05E-01	4.55E-01	-5.70E-02	-1.21E-02
46	0.00E+00	2.91E-01	2.28E-01	-2.71E-01	-2.59E-01
						55	0.00E+00	-7.75E+00	3.12E-01	-3.90E-01	-1.42E-01
56	0.00E+00	-2.54E+01	-7.85E+00	1.07E+00	3.23E+00
						Flour with a plurality of grooves	a ₁₂	a ₁₄	a ₁₆	a ₁₈	a ₂₀
15	-9.30E-01	6.15E-01	-1.61E-01	0.00E+00	0.00E+00
						16	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
25	3.89E+00	-2.77E+00	1.71E+00	0.00E+00	0.00E+00
						26	1.37E-03	6.19E-04	2.01E-04	0.00E+00	0.00E+00
35	-4.19E-03	-2.35E-03	-1.25E-03	0.00E+00	0.00E+00
						36	-1.93E-02	-1.97E-03	-1.93E-04	0.00E+00	0.00E+00
45	2.33E-03	7.48E-03	3.93E-03	7.20E-03	5.39E-03
						46	-4.85E-02	6.62E-02	5.66E-02	1.62E-02	8.40E-04
55	-1.93E-01	-1.40E-01	-2.66E-02	5.41E-02	3.38E-02
						56	4.09E-01	-1.63E+00	-1.66E+00	-7.23E-01	-1.50E-01

Referring again to fig. 2B to 2D, fig. 2B shows graphs of curvature of field aberrations in the meridian direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm respectively enters the imaging lens 10 of the second embodiment, fig. 2C shows graphs of curvature of field aberrations in the sagittal direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm respectively enters the imaging lens 10 of the second embodiment, and fig. 2D shows graphs of aberrations when light having wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm respectively enters the imaging lens 10 of the second embodiment.

As shown in the field curvature aberration diagrams of fig. 2B and 2C, the field curvature aberration of five representative wavelengths within the entire field of view falls within ±0.10mm, which illustrates that the image capturing lens 10 according to the second embodiment of the present invention can effectively eliminate the field curvature aberration. As shown in the distortion graph of fig. 2D, the distortion aberration of the five representative wavelengths in the entire field of view is less than ±2%, which indicates that the imaging lens 10 according to the second embodiment of the present invention has good imaging quality.

Referring to fig. 3A, a schematic diagram of an imaging lens according to a third embodiment of the present invention is shown. The image capturing lens 10 of the third embodiment of the present invention includes, in order from an object side A1 to an image side A2, an aperture stop 0, lenses 1 to 5, and a filter 8 along an optical axis I of the image capturing lens 10. When light emitted from an object to be photographed enters the image capturing lens 10 and sequentially passes through the aperture 0, the lens 1, the lens 2, the lens 3, the lens 4, the lens 5 and the filter 8, an image is formed on the image plane 99.

The lens element 1 has positive refractive power, wherein an optical axis region of the object-side surface 15 is convex, an optical axis region of the image-side surface 16 is concave, and both the object-side surface 15 and the image-side surface 16 are aspheric.

Other detailed optical data for the third embodiment are shown in Table five, where the image height is half of the diagonal of the imaging plane 99.

Table five:

in Table five, the distance between the object-side surfaces 15 (0.596 mm as shown in Table five) is the thickness of the lens element 1 on the optical axis I, the distance between the image-side surfaces 16 (0.177 mm as shown in Table five) is the distance between the image-side surfaces 16 of the lens element 1 and the object-side surfaces 25 of the lens element 2 on the optical axis I, i.e. the gap between the lens elements 1 and 2 on the optical axis I, and so on.

The column labeled a in table five represents the distance between the focusing range of the imaging lens 10 and the object side 15 of the lens 1. In this embodiment, the range of the a field is greater than or equal to 150mm. In other words, the focusing range of the imaging lens 10 is a range from 150mm to infinity from the object side surface 15 toward the object side A1 direction. Wherein, when the focusing position is the position 150mm away from the object side surface 15 of the lens 1 (i.e. when the a field is 150 mm), the gap between the lens 4 and the lens 5 on the optical axis I (i.e. the B field in table five) is 0.156mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e. the C field in table five) is 0.485mm. In contrast, when the focusing position is the position away from the object side surface 15 of the lens 1 by infinity (i.e. when the a field is infinity), the gap between the lens 4 and the lens 5 on the optical axis I (i.e. the B field in table five) is 0.100mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e. the C field in table five) is 0.541mm.

The cone coefficient K and each aspheric coefficient in the above aspheric formula (1) are shown in table six. In table six, reference numeral 15 denotes an aspherical surface coefficient of the object side surface 15 of the lens 1, reference numeral 16 denotes an aspherical surface coefficient of the image side surface 16 of the lens 1, and the other reference numerals are the same.

Table six:

flour with a plurality of grooves	K	a ₄	a ₆	a ₈	a ₁₀
						15	0.00E+00	-3.57E-02	-1.20E-01	1.42E-01	-1.30E-02
16	0.00E+00	-2.20E-01	-1.45E-01	-2.12E-01	0.00E+00
						25	0.00E+00	-2.24E-01	-6.04E-01	1.16E+00	-3.76E+00
26	0.00E+00	-4.64E-01	-2.85E-02	1.89E-02	3.74E-03
						35	0.00E+00	-3.14E-01	1.61E-01	-7.41E-03	1.25E-03
36	0.00E+00	-5.10E-01	4.54E-01	-3.91E-02	3.87E-02
						45	0.00E+00	-4.11E-01	4.60E-01	-3.92E-02	-2.86E-02
46	0.00E+00	3.41E-01	2.14E-01	-3.11E-01	-2.79E-01
						55	0.00E+00	-1.03E+01	1.24E+00	-4.60E-01	-4.19E-01
56	0.00E+00	-2.53E+01	-8.04E+00	9.98E-01	3.18E+00
						Flour with a plurality of grooves	a ₁₂	a ₁₄	a ₁₆	a ₁₈	a ₂₀
15	-9.30E-01	6.15E-01	-1.61E-01	0.00E+00	0.00E+00
						16	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
25	3.89E+00	-2.77E+00	1.71E+00	0.00E+00	0.00E+00
						26	1.13E-04	-1.42E-04	1.35E-04	0.00E+00	0.00E+00
35	-6.37E-03	-3.41E-03	-1.09E-03	0.00E+00	0.00E+00
						36	-2.34E-02	-4.99E-03	-7.30E-04	0.00E+00	0.00E+00
45	-3.34E-03	5.94E-03	1.02E-02	1.19E-02	6.40E-03
						46	-4.00E-02	7.11E-02	4.86E-02	9.95E-03	-1.20E-03
55	-1.48E-01	-5.24E-02	-6.03E-02	-9.02E-04	1.77E-02
						56	4.34E-01	-1.66E+00	-1.70E+00	-7.50E-01	-1.48E-01

Referring again to fig. 3B to 3D, fig. 3B shows graphs of curvature of field aberrations in the meridian direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, is incident on the imaging lens 10 of the third embodiment, fig. 3C shows graphs of curvature of field aberrations in the sagittal direction when light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, is incident on the imaging lens 10 of the third embodiment, and fig. 3D shows graphs of aberrations when light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, is incident on the imaging lens 10 of the third embodiment.

As shown in the field curvature aberration diagrams of fig. 3B and 3C, the field curvature aberration of five representative wavelengths within the entire field of view falls within ±0.05mm, which illustrates that the imaging lens 10 according to the third embodiment of the present invention can effectively eliminate the field curvature aberration. As shown in the distortion graph of fig. 3D, the distortion aberration of the five representative wavelengths in the entire field of view is less than ±2%, which indicates that the imaging lens 10 according to the third embodiment of the present invention has good imaging quality.

Embodiments of the present invention satisfy the conditional expression 2.5< |f2/f3| <5.5, where f2 is the focal length of lens 2 and f3 is the focal length of lens 3.

Embodiments of the present invention satisfy the conditional expression 1.35< TTL/ImgH <1.5, where TTL is the distance on the optical axis I from the object side surface 15 of the lens 1 to the imaging surface 99, and ImgH is half the diagonal (image height) of the imaging surface 99.

Each embodiment of the present invention satisfies the condition 2.5< TTL/ENPD <4.5, where TTL is the distance on the optical axis I from the object side surface 15 to the imaging surface 99 of the lens 1, and ENPD is the size of the entrance pupil of the imaging lens 10, where the entrance pupil sizes of the imaging lens 10 of the first to third embodiments are 1.1mm, 1.32mm, and 1.4mm, respectively.

Embodiments of the present invention satisfy the conditional expression 3< (t2+d23+t3)/D23 <6, where T2 is the thickness of the lens 2 on the optical axis I, T3 is the thickness of the lens 3 on the optical axis I, and D23 is the gap of the lens 2 and the lens 3 on the optical axis I.

Embodiments of the present invention satisfy the condition 0.2< R15/R56<0.3, wherein R15 is the radius of the object-side surface 15 of the lens 1 and R56 is the radius of the image-side surface 56 of the lens 5, wherein the radii of the object-side surfaces 15 of the first to third embodiments are 0.685mm, 0.661mm and 0.551mm, respectively, and the radii of the image-side surfaces 56 are 2.443mm, 2.415mm and 2.392mm, respectively.

The embodiments of the present invention satisfy the condition 5<1000ZL/TTL <40, where TTL is the distance between the object side surface 15 of the lens 1 and the imaging surface 99 on the optical axis I, and ZL is the moving distance of the lens 5 in the focusing stroke of the image capturing lens 10.

In summary, the image capturing lens provided in the embodiment of the invention performs the focusing stroke by moving the fifth lens, and the total lens length of the image capturing lens is kept constant during focusing, and the imaging quality is high, so that the image capturing lens is suitable for being configured on a thin portable electronic device, and particularly can be used as a front lens of the portable electronic device.

Claims

1. An image capturing lens, comprising, in order from an object side to an image side along an optical axis:

a first lens having a positive diopter;

a second lens having a positive diopter;

a third lens having a negative diopter;

a fourth lens having a positive diopter; and

a fifth lens having a negative diopter,

the image capturing lens has five lenses with diopters, wherein the first lens to the fifth lens are aspheric lenses, and the image capturing lens executes focusing travel by moving the fifth lens,

the imaging lens satisfies the condition 2.5< |f2/f3| <5.5, wherein f2 is the focal length of the second lens and f3 is the focal length of the third lens.

2. The imaging lens as claimed in claim 1, wherein the imaging lens further satisfies a conditional expression 1.35< TTL/ImgH <1.5, wherein TTL is a distance from an object side surface to an imaging surface of the first lens on the optical axis, and ImgH is half of a diagonal line of the imaging surface.

3. The imaging lens as claimed in claim 1, wherein a distance between a focusing range of the imaging lens and an object side surface of the first lens is greater than or equal to 150mm.

4. The imaging lens as claimed in claim 1, wherein the imaging lens further satisfies a conditional expression 2.5< TTL/ENPD <4.5, wherein TTL is a distance on the optical axis from an object side surface to an imaging surface of the first lens, and ENPD is a size of an entrance pupil of the imaging lens.

5. The imaging lens according to claim 1, wherein the imaging lens further satisfies a conditional expression of 1.7< (t2+d23+t3)/D23 <2.4, where T2 is a thickness of the second lens on the optical axis, T3 is a thickness of the third lens on the optical axis, and D23 is a gap of the second lens and the third lens on the optical axis.

6. The imaging lens as claimed in claim 1, wherein the imaging lens further satisfies a conditional expression 0.2< R15/R56<0.3, wherein R15 is a radius of an object side surface of the first lens element, and R56 is a radius of an image side surface of the fifth lens element.

7. The imaging lens as claimed in claim 1, wherein the F value of the imaging lens is greater than or equal to 2.0 and less than or equal to 2.2.

8. The imaging lens of claim 1, wherein a full field angle of the imaging lens is greater than or equal to 90 ° and less than or equal to 100 °.

9. The imaging lens as claimed in claim 1, wherein the imaging lens further satisfies a condition 5<1000ZL/TTL <40, wherein TTL is a distance from an object side surface to an imaging surface of the first lens on the optical axis, and ZL is a moving distance of the fifth lens in a focusing stroke of the imaging lens.