TW202107145A - Imaging lens, imaging device and electronic device having the same - Google Patents

Abstract

An imaging lens including, in order from an object side to an image side, an aperture stop, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having positive refractive power. The first lens and the second lens have a positive composite focal length. The first lens has an image-side surface being concave. The fourth lens has an object-side surface being concave and an image-side surface being convex. The fifth lens has an object-side surface being convex. The imaging lens includes a total of five elements. When specific conditions are satisfied, it is favorable to provide a miniaturized imaging lens having good environmental endurance and being capable of capturing high quality images.

Description

Imaging lens group, imaging device and electronic device

The present invention relates to an imaging lens group and an imaging device, in particular to an imaging lens group, an imaging device and an electronic device suitable for an automotive photographic electronic device or a surveillance camera system.

With the advancement of semiconductor process technology, the pixels of the image sensor device can reach a smaller size, thereby improving the performance of the overall image sensor device. Therefore, the imaging quality of optical imaging lenses must also be continuously improved to meet the needs of the current consumer market.

With the diversified development of consumer electronic products, such as smart phones, sports cameras, driving recorders, reversing cameras, and home surveillance photography equipment, the design requirements for optical imaging lenses have become more diversified. Taking automotive photography devices as an example, optical imaging lenses are usually required to have better environmental adaptability. For example, from cold regions with low temperatures to tropical regions with high temperatures, it is necessary to maintain stable imaging in accordance with temperature changes in different regions and seasons. quality. In addition, as the specifications and volumes of consumer electronic products are also pursuing lightness, thinness and shortness, related components including optical imaging lenses, etc., must be further thinned in size. However, reducing the volume of optical imaging lenses often makes it difficult to balance the viewing angle and imaging quality at the same time.

Therefore, how to provide an optical imaging lens that is miniaturized, resistant to environmental and climate changes, and has high imaging quality is the goal of continuous efforts by those in the technical field.

Therefore, in order to solve the above-mentioned problems, the present invention provides an imaging lens assembly that includes an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence from the object side to the image side. Among them, the first lens has negative refractive power and its image side is concave; the second lens has positive refractive power; the third lens has negative refractive power; the fourth lens is a meniscus lens with positive refractive power, and its object side is Concave, the image side is convex; the fifth lens has positive refractive power, and its object side is convex. The total number of lenses in the imaging lens group is five. The effective focal length of the imaging lens group is EFL, and the combined focal length of the first lens and the second lens is f12, which satisfies the following relationship: 0.5>f12/EFL>1.6.

The present invention also provides an imaging lens assembly, which includes an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence from the object side to the image side. Wherein, the first lens has a negative refractive power and its image side surface is concave; the second lens has a positive refractive power, wherein the combined focal length of the first lens and the second lens is a positive value; the third lens has a negative refractive power; The fourth lens has positive refractive power, and its object side is concave, and its image side is convex; and the fifth lens has positive refractive power, and its object side is convex. The total number of lenses in the imaging lens group is five. The effective focal length of the imaging lens group is EFL, the focal length of the second lens is f2, the distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis is TTL, and the maximum image height of the imaging lens group The imaging lens group satisfies the following relationship: 0.4>f2/EFL>0.9; and 3.8>TTL/ImgH>5.1.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 0.2>f3/f1>0.7; where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

According to an embodiment of the present invention, the fourth lens system of the imaging lens group satisfies the following relationship: 0.25>R8/R7>0.6; where R7 is the radius of curvature of the object side of the fourth lens, and R8 is the fourth lens image The radius of curvature of the side.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 0.11>CT4/TTL>0.19; where CT4 is the thickness of the fourth lens, and TTL is the imaging from the object side of the first lens to the imaging lens group The distance of the surface on the optical axis.

According to an embodiment of the present invention, the fifth lens of the imaging lens group satisfies the following relationship: 0.7>(C9+C10)/(C9-C10)>2.5; wherein the curvature of the fifth lens object side is C9 , The curvature of the image side is C10.

According to an embodiment of the present invention, the imaging lens system satisfies the following relationship: 0.03>CT5/TTL>0.1; where CT5 is the thickness of the fifth lens.

According to an embodiment of the present invention, the imaging lens group includes at least two lenses with a refractive index greater than 1.7.

According to an embodiment of the present invention, the second lens of the imaging lens group satisfies the following relationship: Nd2>1.75; where Nd2 is the refractive index of the second lens.

According to an embodiment of the present invention, the object side surface and the image side surface of the third lens of the imaging lens group are both aspherical, and the material of the third lens is glass.

According to an embodiment of the present invention, the object side surface of the third lens of the imaging lens group is convex at the near optical axis.

According to an embodiment of the present invention, both the object side surface and the image side surface of the second lens of the imaging lens group are convex surfaces.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 3.8>TTL/ImgH>5.1; where TTL is the distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis, ImgH Is the maximum image height of the imaging lens group.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 0.4>f2/EFL>0.9; where f2 is the focal length of the second lens.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 0.9>f4/EFL>1.6; where f4 is the focal length of the fourth lens.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 1.3>f5/EFL>6; where f5 is the focal length of the fifth lens.

According to an embodiment of the present invention, the imaging lens group satisfies the following relationship: 0.7>AT34/(AT12+AT23+AT45)>4.3; where AT12 is the image side of the first lens to the object side of the second lens on the optical axis The distance above, AT23 is the distance from the image side of the second lens to the object side of the third lens on the optical axis, AT34 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis, and AT45 is the fourth lens image The distance from the side to the object side of the fifth lens on the optical axis.

The present invention further provides an imaging device, which includes the aforementioned imaging lens group and an image sensing element.

The present invention further provides an electronic device, which includes the aforementioned imaging device and a near-infrared emitting element.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, several embodiments are listed below, and are described in detail below in conjunction with the accompanying drawings.

In the following embodiments, the lenses of the imaging lens group can be made of glass or plastic materials, and are not limited to the materials listed in the embodiments. When the lens material is glass, the lens surface can be processed by grinding or molding; in addition, due to the temperature change and high hardness of the glass material itself, the impact of environmental changes on the imaging lens group can be reduced, thereby extending the imaging lens group Life. When the lens material is plastic, it is beneficial to reduce the weight of the imaging lens group and reduce the production cost.

In the embodiment of the present invention, each lens includes an object side facing the object and an image side facing the imaging surface. The surface shape of each lens is defined based on the shape of the area near the optical axis (paraxial) of the surface. For example, when the object side of a lens is described as convex, it means that the object side of the lens near the optical axis is convex. That is, although the lens surface is described as convex in the embodiment, the surface may be convex or concave in the region away from the optical axis (off-axis). The shape of the paraxial position of each lens is judged by the positive or negative curvature radius of the surface. For example, if the curvature radius of the object side of a lens is positive, the object side surface is convex; otherwise, if it is If the radius of curvature is negative, the side surface of the object is concave. As for the image side surface of a lens, if its radius of curvature is positive, the image side surface is concave; conversely, if its radius of curvature is negative, the image side surface is convex.

In the embodiment of the present invention, the total track length (TTL) of the imaging lens group is defined as the distance on the optical axis from the object side of the first lens of the imaging lens group to the imaging surface. The imaging height of this imaging lens group is called the maximum image height ImgH (Image Height); when an image sensing element is set on the imaging surface, the maximum image height ImgH represents half of the diagonal length of the effective sensing area of the image sensing element . In the following embodiments, the units of curvature radius of all lenses, lens thickness, distance between lenses, total lens group length TTL, maximum image height ImgH, and focal length (Focal Length) are all expressed in millimeters (mm).

The present invention provides an imaging lens group, which sequentially includes an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the object side to the image side. The total number of lenses in this imaging lens group is five.

The first lens has negative refractive power, and its image side surface is concave. Thereby, the light receiving range can be increased, and the shooting angle of the imaging lens group can be enlarged.

The second lens has a positive refractive power to converge light. Wherein, the combined focal length of the first lens and the second lens is a positive value. Therefore, by arranging the first lens and the second lens, the incident light at a larger angle can be received and the aberration can be corrected effectively.

The third lens has a negative refractive power and is used as an element for adjusting the optical path to guide the light to the fourth lens and the fifth lens behind to increase the image height of the imaging lens group on the imaging surface. By setting the third lens with negative refractive power, the distortion aberration of the imaging lens group can be effectively corrected.

The fourth lens has positive refractive power. The fourth lens is a meniscus lens, the object side is concave and the image side is convex.

The fifth lens has positive refractive power, and its object side surface is convex. With the configuration of the refractive power of the fourth lens and the fifth lens, and the structure in which the image side surface of the fourth lens and the object side surface of the fifth lens are opposite to each other, the curvature of field aberration and spherical image of the imaging lens group can be effectively corrected difference.

The effective focal length of the imaging lens group is EFL, the combined focal length of the first lens and the second lens is f12, and the imaging lens group satisfies the following relationship:

0.5>f12/EFL>1.6 (1);

By satisfying the condition of relation (1), it is beneficial to reduce the volume of the imaging lens group while maintaining good optical performance. If f12/EFL exceeds the upper limit of relation (1), spherical aberration and coma aberration will be more difficult to correct; if f12/EFL is lower than the lower limit of relation (1), the total length of the imaging lens group becomes longer .

The focal length of the third lens of the imaging lens group is f3, and the focal length f1 of the first lens satisfies the following relationship:

0.2>f3/f1>0.7; (2);

By satisfying the condition of relation (2), it is beneficial to correct the distortion aberration of the imaging lens group.

The distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis is TTL, and the diagonal half of the effective sensing area of the image sensing element on the imaging surface is ImgH, and the relationship between the two satisfies The following relationship:

3.8>TTL/ImgH>5.1 (3);

By satisfying the condition of relation (3), it is beneficial to maintain the miniaturization of the imaging lens group.

The focal length of the second lens of the imaging lens group is f2, which satisfies the following relationship with the effective focal length EFL of the imaging lens group:

0.4>f2/EFL>0.9; (4);

By satisfying the condition of relation (4), the angle of incident light on the surface of the third lens can be reduced through the positive refractive power provided by the second lens, so as to facilitate the correction of the aberration of the imaging lens group.

The fourth lens of the imaging lens group satisfies the following relationship:

0.25>R8/R7>0.6 (5);

Among them, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens. By satisfying the condition of relation (5), it is beneficial to correct the curvature of field aberration of the imaging lens group.

The fourth lens further satisfies the following relationship:

0.11>CT4/TTL>0.19 (6);

Among them, CT4 is the thickness of the fourth lens.

The curvature of the object side of the fifth lens of the imaging lens group is C9, and the curvature of the image side is C10, which satisfies the following relationship:

0.7>(C9+C10)/(C9-C10)>2.5 (7);

By satisfying the condition of relation (7), it is beneficial to correct the spherical aberration of the imaging lens group.

The fifth lens further satisfies the following relationship:

0.03>CT5/TTL>0.1 (8);

Among them, CT5 is the thickness of the fifth lens on the optical axis.

The imaging lens group has five lenses with refractive power, including at least two lenses with a refractive index greater than 1.7. Thereby, the imaging aberration of the imaging lens group can be reduced.

The imaging lens group further satisfies the following relationship:

Nd2>1.75 (9);

Among them, Nd2 is the refractive index of the second lens. By satisfying the condition of relation (9), it is beneficial to reduce the distortion aberration of the imaging lens group.

The object side surface and the image side surface of the third lens of the imaging lens group are both aspherical, and the material of the third lens is glass.

The focal length of the fourth lens of the imaging lens group is f4, and the relationship between it and the effective focal length EFL of the imaging lens group satisfies the following relationship:

0.9>f4/EFL>1.6 (10).

The focal length of the fifth lens of the imaging lens group is f5, and the relationship between it and the effective focal length EFL of the imaging lens group satisfies the following relationship:

1.3>f5/EFL>6 (11).

The distance from the image side of the first lens to the object side of the second lens on the optical axis of the imaging lens group is AT12, the distance from the image side of the second lens to the object side of the third lens on the optical axis is AT23, and the third lens image The distance from the side to the object side of the fourth lens on the optical axis is AT34, and the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis is AT45, which satisfies the following relationship:

0.7>AT34/(AT12+AT23+AT45)>4.3 (12);

By satisfying the condition of relation (12), it is beneficial to control the total length of the imaging lens group and to correct aberrations. The first embodiment

Referring to FIG. 1A and FIG. 1B, FIG. 1A is a schematic diagram of the imaging lens group according to the first embodiment of the present invention. FIG. 1B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the first embodiment of the present invention in order from left to right.

As shown in FIG. 1A, the imaging lens group 10 of the first embodiment includes an aperture ST, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14 and a fifth lens in sequence from the object side to the image side. 15. The imaging lens group 10 can further include a filter element 16, a protective glass 17 and an imaging surface 18. An image sensing element 100 can be further provided on the imaging surface 18 to form an imaging device (not marked separately).

The first lens 11 has a negative refractive power, the object side surface 11a is a flat surface, the image side surface 11b is a concave surface, and the object side surface 11a and the image side surface 11b are spherical surfaces. The material of the first lens 11 is glass.

The second lens 12 has a positive refractive power, the object side surface 12a is convex, the image side surface 12b is convex, and both the object side surface 12a and the image side surface 12b are spherical surfaces. The material of the second lens 12 is glass. Wherein, the composite focal length (Composite Focal Length) of the first lens 11 and the second lens 12 is a positive value.

The third lens 13 has a negative refractive power, the object side 13a is convex (convex at the paraxial position and concave at the off-axis), the image side 13b is concave, and both the object side 13a and the image side 13b are aspherical. The material of the third lens is glass.

The fourth lens 14 is a meniscus lens with positive refractive power, the object side 14a is concave, the image side 14b is convex, and both the object side 14a and the image side 14b are spherical. The material of the fourth lens is glass.

The fifth lens 15 has a positive refractive power, the object side 15a is convex, the image side 15b is concave, and both the object side 15a and the image side 15b are spherical. The material of the fifth lens is glass.

The filter element 16 is disposed between the fifth lens 15 and the imaging surface 18 to filter out light in a specific wavelength range. Both surfaces 16a and 16b of the filter element 16 are flat surfaces, and the material is glass.

The protective glass 17 is disposed on the image sensor 100, and its two surfaces 17a, 17b are both flat surfaces, and its material is glass.

The image sensor (Image Sensor) 100 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The curve equation of each aspheric surface mentioned above is expressed as follows:

Among them, X: the distance between the point Y on the aspheric surface from the optical axis and the tangent surface of the aspheric surface on the optical axis;

Y: the vertical distance between the point on the aspheric surface and the optical axis;

R: the radius of curvature of the lens near the optical axis;

K: Cone coefficient; and

Ai: the i-th order aspheric coefficient.

Please refer to Table 1 below, which is the detailed optical data of the imaging lens group 10 according to the first embodiment of the present invention. Wherein, the object side surface 11a of the first lens 11 is marked as surface 11a, the image side surface 11b is marked as surface 11b, and the other lens surfaces are deduced by analogy. The value in the distance column in the table represents the distance from the surface to the next surface on the optical axis I. For example, the distance from the object side 11a to the image side 11b of the first lens 11 is 0.5 mm, which means that the first lens 11 is on the optical axis. The thickness is 0.5mm. The distance from the image side surface 11b of the first lens 11 to the object side surface 12a of the second lens 12 is 0.08 mm. Others can be deduced by analogy, and will not be repeated below.

In the first embodiment, the effective focal length of the imaging lens group 10 is EFL, the aperture value (F-number) is Fno, half of the maximum angle of view of the overall imaging lens group 10 is HFOV (Half Field of View), and the object of the first lens 11 The distance from the side surface 11a to the imaging surface 18 on the optical axis I is the total length TTL, and the half diagonal of the effective sensing area of the image sensor 100 on the imaging surface 18 is the maximum image height ImgH, and its value is as follows: EFL=5.63mm , Fno=2.10, TTL=12.22mm, HFOV=30.5 degrees, ImgH=3.14mm. The first embodiment EFL = 5.63 mm, Fno = 2.10, HFOV = 30.5 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 11a Spherical unlimited 0.500 1.579 61.2 -11.20 glass 11b Spherical 6.488 0.080 Second lens 12a Spherical 8.526 1.232 1.834 40.6 4.20 glass 12b Spherical -5.550 0.150 Third lens 13a Aspherical 20.865 0.922 1.512 70.1 -5.33 glass 13b Aspherical 2.378 1.345 Fourth lens 14a Spherical -11.079 1.905 1.973 27.7 6.84 glass 14b Spherical -4.511 0.100 Fifth lens 15a Spherical 13.431 0.951 1.813 37.2 17.81 glass 15b Spherical 178.594 0.300 Filter element 16a flat unlimited 0.400 1.508 64.2 glass 16b flat unlimited 3.811 Protective glass 17a flat unlimited 0.400 1.508 64.2 glass 17b flat unlimited 0.125 Imaging surface 18 flat unlimited Reference wavelength: 940 nm Table I

Please refer to Table 2 below, which shows the aspheric coefficients of each surface of the third lens 13 in the first embodiment of the present invention. Among them, K is the conical surface coefficient in the aspheric curve equation, and A ₄ to A ₁₀ represent the 4th to 10th order aspheric coefficients of each surface. For example, the conical coefficient K of the object side surface 13a of the third lens 13 is -1210. Others can be deduced by analogy, and will not be repeated below. In addition, the tables of the following embodiments correspond to the imaging lens groups of the embodiments, and the definition of each table is the same as that of this embodiment, so it will not be repeated in the following embodiments. Aspheric coefficients of the first embodiment surface 13a 13b K -1.21E+03 -5.24E+00 A ₄ -3.21E-02 -7.33E-03 A ₆ 3.39E-03 8.45E-04 A ₈ -4.67E-04 -5.77E-05 A ₁₀ 3.64E-05 1.77E-06 Table II

In the first embodiment, the relationship between the combined focal length f12 of the first lens 11 and the second lens 12 and the effective focal length EFL of the imaging lens group 10 is f12/EFL=1.112.

In the first embodiment, the relationship between the focal length f1 of the first lens 11 and the focal length f3 of the third lens 13 is f3/f1=0.476.

In the first embodiment, the relationship between the TTL of the imaging lens group 10 and the maximum image height ImgH is TTL/ImgH=3.897.

In the first embodiment, the relationship between the focal length f2 of the second lens and the effective focal length EFL of the imaging lens group 10 is f2/EFL=0.745.

In the first embodiment, the relationship between the radius of curvature R7 of the object side surface 14a of the fourth lens 14 and the radius of curvature R8 of the image side surface 14b is R8/R7=0.407.

In the first embodiment, the relationship between the thickness CT4 of the fourth lens 14 on the optical axis and the total length TTL of the imaging lens group 10 is CT4/TTL=0.156.

In the first embodiment, the relationship between the curvature C9 of the object side surface 15a of the fifth lens 15 and the curvature C10 of the image side surface is (C9+C10)/(C9-C10)=1.163.

In the first embodiment, the relationship between the thickness CT5 of the fifth lens 15 on the optical axis and the total length TTL of the imaging lens group 10 is CT5/TTL=0.078.

In the first embodiment, the refractive index of the second lens 12 is Nd2=1.834.

In the first embodiment, the relationship between the focal length f4 of the fourth lens 14 and the effective focal length EFL of the imaging lens group 10 is f4/EFL=1.214.

In the first embodiment, the relationship between the focal length f5 of the fifth lens 15 and the effective focal length EFL of the imaging lens group 10 is f5/EFL=3.162.

In the first embodiment, the distance between the image side surface 11b of the first lens 11 and the object side surface 12a of the second lens 12 on the optical axis AT12, the distance between the image side surface 12b of the second lens 12 and the object side surface 13a of the third lens 13 on the optical axis AT23, the distance between the image side 13b of the third lens 13 and the object side 14a of the fourth lens 14 on the optical axis AT34, and the distance between the image side 14b of the fourth lens 14 and the object side 15a of the fifth lens 15 on the optical axis AT45 The relational formula is AT34/(AT12+AT23+AT45)=4.076.

It can be seen from the numerical values of the foregoing relational expressions that the imaging lens group 10 of the first embodiment satisfies the requirements of relational expressions (1) to (12).

1B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 10, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. From the astigmatic field curvature aberration diagram (wavelength 940nm), it can be seen that the focal length change of the sagittal aberration in the entire field of view is within + 0.08mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.04mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 1B, the imaging lens assembly 10 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Second embodiment

2A and 2B, FIG. 2A is a schematic diagram of the imaging lens group 20 according to the second embodiment of the present invention. FIG. 2B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the second embodiment of the present invention in order from left to right.

As shown in FIG. 2A, the imaging lens group 20 of the second embodiment includes an aperture ST, a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, and a fifth lens in sequence from the object side to the image side. 25. The imaging lens group 20 can further include a filter element 26, a protective glass 27 and an imaging surface 28. An image sensing element 200 can be further provided on the imaging surface 28 to form an imaging device (not marked separately).

The first lens 21 has a negative refractive power, the object side surface 21a is convex, the image side surface 21b is concave, and the object side surface 21a and the image side surface 21b are spherical surfaces. The material of the first lens 21 is glass.

The second lens 22 has a positive refractive power, the object side surface 22a is a convex surface, the image side surface 22b is a convex surface, and the object side surface 22a and the image side surface 22b are spherical surfaces. The material of the second lens 22 is glass.

The third lens 23 has a negative refractive power, the object side 23a is convex (convex at the paraxial position and concave at the off-axis), the image side 23b is concave, and the object side 23a and the image side 23b are aspherical. . The material of the third lens 23 is glass.

The fourth lens 24 has a positive refractive power, the object side surface 24a is concave, the image side surface 24b is convex, and both the object side surface 24a and the image side surface 24b are spherical surfaces. The material of the fourth lens 24 is glass.

The fifth lens 25 has a positive refractive power, the object side surface 25a is convex, the image side surface 25b is convex, and both the object side surface 25a and the image side surface 25b are spherical surfaces. The material of the fifth lens 25 is glass.

The filter element 26 is disposed between the fifth lens 25 and the imaging surface 28 to filter out light in a specific wavelength range. Both surfaces 26a and 26b of the filter element 26 are flat surfaces, and the material is glass.

The protective glass 27 is disposed on the image sensing element 200, and its two surfaces 27a, 27b are flat surfaces, and the material is glass.

The image sensor 200 is, for example, a charge-coupled device (CCD) image sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficient of the lens surface of the imaging lens group 20 of the second embodiment are listed in Table 3 and Table 4, respectively. In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Second embodiment EFL = 5.65 mm, Fno = 2.09, HFOV = 30 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 21a Spherical 29.880 0.812 1.593 60.7 -11.09 glass 21b Spherical 5.337 0.285 Second lens 22a Spherical 10.914 1.309 1.813 37.3 4.76 glass 22b Spherical -5.668 0.144 Third lens 23a Aspherical 32.925 1.022 1.512 70.1 -5.42 glass 23b Aspherical 2.534 1.517 Fourth lens 24a Spherical -13.975 1.802 1.961 20.7 6.54 glass 24b Spherical -4.611 0.836 Fifth lens 25a Spherical 16.168 0.878 1.874 34.0 16.16 glass 25b Spherical -108.861 0.300 Filter element 26a flat unlimited 0.400 1.508 64.2 glass 26b flat unlimited 3.972 Protective glass 27a flat unlimited 0.400 1.508 64.2 glass 27b flat unlimited 0.125 Imaging surface 28 flat unlimited Reference wavelength: 940 nm Table Three Aspheric coefficients of the second embodiment surface 23a 23b K 1.61E+02 -4.84E+00 A ₄ -3.26E-02 -7.66E-03 A ₆ 3.53E-03 8.42E-04 A ₈ -5.24E-04 -5.78E-05 A ₁₀ 3.39E-05 1.83E-06 Table Four

In the second embodiment, the numerical values of the relational expressions of the imaging lens group 20 are listed in Table 5. It can be seen from Table 5 that the imaging lens group 20 of the second embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 1.333 f3/f1 0.489 TTL/ImgH 4.518 f2/EFL 0.842 R8/R7 0.330 CT4/TTL 0.131 (C9+C10)/(C9-C10) 0.741 CT5/TTL 0.064 Nd2 1.813 f4/EFL 1.158 f5/EFL 2.861 AT34/(AT12+AT23+AT45) 1.200 Table 5

2B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 20, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 940nm) that the focal length change of the sagittal aberration in the entire field of view is within + 0.08mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.05mm; and the distortion aberration can be controlled within 7%. As shown in FIG. 2B, the imaging lens group 20 of this embodiment has well corrected various aberrations, which meets the imaging quality requirements of the optical system. The third embodiment

Referring to FIG. 3A and FIG. 3B, FIG. 3A is a schematic diagram of the imaging lens group 30 according to the third embodiment of the present invention. FIG. 3B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the third embodiment of the present invention in order from left to right.

As shown in FIG. 3A, the imaging lens group 30 of the third embodiment includes an aperture ST, a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, and a fifth lens in sequence from the object side to the image side. 35. The imaging lens group 30 can further include a filter element 36, a protective glass 37 and an imaging surface 38. An image sensing element 300 can be further provided on the imaging surface 38 to form an imaging device (not marked separately).

The first lens 31 has a negative refractive power, the object side surface 31a is convex, the image side surface 31b is concave, and the object side surface 31a and the image side surface 31b are spherical surfaces. The material of the first lens 31 is glass.

The second lens 32 has a positive refractive power, the object side surface 32a is convex, the image side surface 32b is convex, and both the object side surface 32a and the image side surface 32b are spherical surfaces. The material of the second lens 32 is glass.

The third lens 33 has a negative refractive power, the object side 33a is convex (convex at the paraxial position and concave at the off-axis), the image side 33b is concave, and the object side 33a and the image side 33b are aspherical. . The material of the third lens 33 is glass.

The fourth lens element 34 has a positive refractive power, the object side surface 34a is concave, the image side surface 34b is convex, and both the object side surface 34a and the image side surface 34b are spherical surfaces. The material of the fourth lens 34 is glass.

The fifth lens 35 has a positive refractive power, the object side 35a is convex, the image side 35b is concave, and both the object side 35a and the image side 35b are spherical. The material of the fifth lens 35 is glass.

The filter element 36 is disposed between the fifth lens 35 and the imaging surface 38 to filter out light in a specific wavelength range. Both surfaces 36a and 36b of the filter element 36 are flat surfaces, and the material is glass.

The protective glass 37 is disposed on the image sensor 300, and its two surfaces 37a, 37b are both flat surfaces, and the material is glass.

The image sensor 300 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficient of the lens surface of the imaging lens group 30 of the third embodiment are listed in Table 6 and Table 7, respectively. In the third embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. The third embodiment EFL = 5.81 mm, Fno = 2.10, HFOV = 29 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 31a Spherical 68.386 0.400 1.602 58.6 -8.92 glass 31b Spherical 4.972 0.254 Second lens 32a Spherical 8.277 1.321 1.792 41.1 4.63 glass 32b Spherical -6.129 0.255 Third lens 33a Aspherical 34.494 0.950 1.502 63.4 -6.00 glass 33b Aspherical 2.743 1.329 Fourth lens 34a Spherical -12.911 1.672 2.094 17.3 5.77 glass 34b Spherical -4.524 0.807 Fifth lens 35a Spherical 15.360 0.864 1.638 39.5 30.19 glass 35b Spherical 74.046 0.300 Filter element 36a flat unlimited 0.400 1.508 64.2 glass 36b flat unlimited 3.983 Protective glass 37a flat unlimited 0.400 1.508 64.2 glass 37b flat unlimited 0.125 Imaging surface 38 flat unlimited Reference wavelength: 940 nm Table 6 Aspheric coefficients of the third embodiment surface 33a 33b K 1.83E+02 -4.93E+00 A ₄ -3.15E-02 -7.84E-03 A ₆ 3.40E-03 8.58E-04 A ₈ -5.77E-04 -5.99E-05 A ₁₀ 3.90E-05 2.03E-06 Table Seven

In the third embodiment, the numerical values of the relational expressions of the imaging lens group 30 are listed in Table 8. It can be seen from Table 8 that the imaging lens group 30 of the third embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 1.434 f3/f1 0.672 TTL/ImgH 4.318 f2/EFL 0.798 R8/R7 0.350 CT4/TTL 0.128 (C9+C10)/(C9-C10) 1.523 CT5/TTL 0.066 Nd2 1.792 f4/EFL 0.993 f5/EFL 5.197 AT34/(AT12+AT23+AT45) 1.010 Table 8

Referring to FIG. 3B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 30, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 940nm) that the focal length change of the sagittal aberration in the entire field of view is within + 0.06mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.05mm; and the distortion aberration can be controlled within 7%. As shown in FIG. 3B, the imaging lens group 30 of this embodiment has been well corrected for various aberrations, which meets the imaging quality requirements of the optical system. Fourth embodiment

Referring to FIGS. 4A and 4B, FIG. 4A is a schematic diagram of an imaging lens group 40 according to a fourth embodiment of the present invention. FIG. 4B shows the longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), the astigmatism field curvature diagram (Astigmatism/Field Curvature) and the distortion aberration diagram (Distortion) of the fourth embodiment of the present invention in order from left to right.

As shown in FIG. 4A, the imaging lens group 40 of the fourth embodiment includes an aperture ST, a first lens 41, a second lens 42, a third lens 43, a fourth lens 44, and a fifth lens in order from the object side to the image side. 45. The imaging lens group 40 can further include a filter element 46, a protective glass 47 and an imaging surface 48. An image sensing element 400 can be further provided on the imaging surface 48 to form an imaging device (not marked separately).

The first lens 41 has a negative refractive power, the object side surface 41a is a flat surface, the image side surface 41b is a concave surface, and the object side surface 41a and the image side surface 41b are spherical surfaces. The material of the first lens 41 is glass.

The second lens 42 has a positive refractive power, the object side 42a is convex, the image side 42b is convex, and both the object side 42a and the image side 42b are spherical. The material of the second lens 42 is glass.

The third lens 43 has a negative refractive power, the object side 43a is convex (convex at the paraxial position and concave at the off-axis), the image side 43b is concave, and the object side 43a and the image side 43b are aspherical. . The material of the third lens 43 is glass.

The fourth lens 44 has a positive refractive power, the object side 44a is concave, the image side 44b is convex, and both the object side 44a and the image side 44b are spherical. The material of the fourth lens 44 is glass.

The fifth lens 45 has a positive refractive power, the object side 45a is convex, the image side 45b is concave, and both the object side 45a and the image side 45b are spherical surfaces. The material of the fifth lens 45 is glass.

The filter element 46 is disposed between the fifth lens 45 and the imaging surface 48 to filter out light in a specific wavelength range. The two surfaces 46a, 46b of the filter element 46 are flat surfaces, and the material is glass.

The protective glass 47 is disposed on the image sensing element 400, and its two surfaces 47a, 47b are flat surfaces, and the material is glass.

The image sensor 400 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficients of the lens surface of the imaging lens group 40 of the fourth embodiment are listed in Table 9 and Table 10, respectively. In the fourth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Fourth embodiment EFL = 5.50 mm, Fno = 2.10, HFOV = 30.5 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 41a Spherical unlimited 0.500 1.579 61.2 -10.64 glass 41b Spherical 6.165 0.080 Second lens 42a Spherical 8.919 1.950 1.834 36.6 4.26 glass 42b Spherical -5.314 0.150 Third lens 43a Aspherical 18.172 0.910 1.512 70.1 -5.32 glass 43b Aspherical 2.331 1.400 Fourth lens 44a Spherical -11.357 2.000 1.972 28.3 6.79 glass 44b Spherical -4.537 0.100 Fifth lens 45a Spherical 13.244 0.960 1.862 39.2 16.91 glass 45b Spherical 139.827 0.300 Filter element 46a flat unlimited 0.400 1.508 64.2 glass 46b flat unlimited 3.778 Protective glass 47a flat unlimited 0.400 1.508 64.2 glass 47b flat unlimited 0.125 Imaging surface 48 flat unlimited Reference wavelength: 940 nm Table 9 Aspheric coefficients of the fourth embodiment surface 43a 43b K -9.30E+02 -5.09E+00 A ₄ -3.19E-02 -7.55E-03 A ₆ 3.39E-03 8.46E-04 A ₈ -5.15E-04 -5.85E-05 A ₁₀ 3.48E-05 1.87E-06 Table 10

In the fourth embodiment, the numerical values of the relational expressions of the imaging lens group 40 are listed in Table 11. It can be seen from Table 11 that the imaging lens group 40 of the fourth embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 1.148 f3/f1 0.500 TTL/ImgH 4.263 f2/EFL 0.774 R8/R7 0.399 CT4/TTL 0.153 (C9+C10)/(C9-C10) 1.209 CT5/TTL 0.074 Nd2 1.834 f4/EFL 1.234 f5/EFL 3.072 AT34/(AT12+AT23+AT45) 4.242 Table 11

Referring to FIG. 4B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 40, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. From the astigmatic field curvature aberration diagram (wavelength 940nm), it can be seen that the focal length change of the sagittal aberration in the entire field of view is within + 0.05mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.09mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 4B, the imaging lens assembly 40 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Fifth embodiment

Referring to FIGS. 5A and 5B, FIG. 5A is a schematic diagram of an imaging lens group 50 according to a fifth embodiment of the present invention. FIG. 5B shows the longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), the astigmatism field curvature (Astigmatism/Field Curvature) and the distortion aberration diagram (Distortion) of the fifth embodiment of the present invention in order from left to right.

As shown in FIG. 5A, the imaging lens group 50 of the fifth embodiment includes an aperture ST, a first lens 51, a second lens 52, a third lens 53, a fourth lens 54 and a fifth lens in sequence from the object side to the image side. 55. The imaging lens group 50 can further include a filter element 56, a protective glass 57 and an imaging surface 58. An image sensing element 500 can be further provided on the imaging surface 58 to form an imaging device (not marked separately).

The first lens 51 has a negative refractive power, the object side 51a is concave, the image side 51b is concave, and both the object side 51a and the image side 51b are spherical surfaces. The material of the first lens 51 is glass.

The second lens 52 has a positive refractive power, the object side surface 52a is convex, the image side surface 52b is convex, and both the object side surface 52a and the image side surface 52b are spherical surfaces. The material of the second lens 52 is glass.

The third lens 53 has a negative refractive power, its object side surface 53a is convex (convex at the paraxial position and concave surface off the axis), its image side surface 53b is concave, and its object side surface 53a and image side surface 53b are both aspherical. . The material of the third lens 53 is glass.

The fourth lens 54 has a positive refractive power, the object side 54a is concave, the image side 54b is convex, and both the object side 54a and the image side 54b are spherical. The material of the fourth lens 54 is glass.

The fifth lens 55 has a positive refractive power, the object side 55a is convex, the image side 55b is convex, and both the object side 55a and the image side 55b are spherical. The material of the fifth lens 55 is glass.

The filter element 56 is disposed between the fifth lens 55 and the imaging surface 58 to filter out light in a specific wavelength range. Both surfaces 56a and 56b of the filter element 56 are flat surfaces, and the material is glass.

The protective glass 57 is disposed on the image sensing element 500, and its two surfaces 57a, 57b are flat surfaces, and the material is glass.

The image sensor 500 is, for example, a charge-coupled device (CCD) image sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficient of the lens surface of the imaging lens group 50 of the fifth embodiment are listed in Table 12 and Table 13, respectively. In the fifth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Fifth embodiment EFL = 5.70 mm, Fno = 2.10, HFOV = 30 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 51a Spherical -275.262 0.400 1.573 59.5 -7.89 glass 51b Spherical 4.598 0.203 Second lens 52a Spherical 8.527 1.619 1.787 35.5 4.53 glass 52b Spherical -5.610 0.291 Third lens 53a Aspherical 31.016 0.985 1.579 61.3 -5.29 glass 53b Aspherical 2.758 1.484 Fourth lens 54a Spherical -16.720 2.068 1.971 29.1 6.39 glass 54b Spherical -4.800 0.246 Fifth lens 55a Spherical 15.090 1.050 1.772 47.4 17.77 glass 55b Spherical -146.849 0.300 Filter element 56a flat unlimited 0.400 1.508 64.2 glass 56b flat unlimited 4.908 Protective glass 57a flat unlimited 0.400 1.508 64.2 glass 57b flat unlimited 0.125 Imaging surface 58 flat unlimited Reference wavelength: 940 nm Table 12 Aspheric coefficients of the fifth embodiment surface 53a 53b K 2.07E+02 -5.64E+00 A ₄ -3.16E-02 -7.74E-03 A ₆ 3.59E-03 8.59E-04 A ₈ -5.23E-04 -6.16E-05 A ₁₀ 2.62E-05 2.29E-06 Table 13

In the fifth embodiment, the numerical values of the relational expressions of the imaging lens group 50 are listed in Table 14. It can be seen from Table 14 that the imaging lens group 50 of the fifth embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 1.514 f3/f1 0.671 TTL/ImgH 4.783 f2/EFL 0.795 R8/R7 0.287 CT4/TTL 0.143 (C9+C10)/(C9-C10) 0.814 CT5/TTL 0.073 Nd2 1.787 f4/EFL 1.121 f5/EFL 3.118 AT34/(AT12+AT23+AT45) 2.005 Table 14

Referring to FIG. 5B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 50, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 940nm) that the focal length change of the sagittal aberration in the entire field of view is within + 0.06mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.06mm; and the distortion aberration can be controlled within 9%. As shown in FIG. 5B, the imaging lens assembly 50 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. Sixth embodiment

Referring to FIGS. 6A and 6B, FIG. 6A is a schematic diagram of an imaging lens group 60 according to a sixth embodiment of the present invention. Fig. 6B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature), and a distortion aberration diagram (Distortion) of the sixth embodiment of the present invention in order from left to right.

As shown in FIG. 6A, the imaging lens group 60 of the sixth embodiment includes an aperture ST, a first lens 61, a second lens 62, a third lens 63, a fourth lens 64, and a fifth lens in sequence from the object side to the image side. 65. The imaging lens group 60 can further include a filter element 66, a protective glass 67 and an imaging surface 68. An image sensing element 600 can be further provided on the imaging surface 68 to form an imaging device (not marked separately).

The first lens 61 has a negative refractive power, the object side surface 61a is a flat surface, the image side surface 61b is a concave surface, and the object side surface 61a and the image side surface 61b are both spherical surfaces. The material of the first lens 61 is glass.

The second lens 62 has a positive refractive power, the object side 62a is convex, the image side 62b is convex, and both the object side 62a and the image side 62b are spherical. The material of the second lens 62 is glass.

The third lens 63 has a negative refractive power, its object side surface 63a is concave, its image side surface 63b is concave, and its object side surface 63a and image side surface 63b are aspherical. The material of the third lens 63 is glass.

The fourth lens 64 has a positive refractive power, the object side 64a is concave, the image side 64b is convex, and both the object side 64a and the image side 64b are spherical. The material of the fourth lens 64 is glass.

The fifth lens 65 has a positive refractive power, the object side surface 65a is convex, the image side surface 65b is concave, and the object side surface 65a and the image side surface 65b are spherical surfaces. The material of the fifth lens 65 is glass.

The filter element 66 is disposed between the fifth lens 65 and the imaging surface 68 to filter out light in a specific wavelength range. Both surfaces 66a and 66b of the filter element 66 are flat surfaces, and the material is glass.

The protective glass 67 is disposed on the image sensor element 600, and its two surfaces 67a, 67b are flat surfaces, and the material is glass.

The image sensor 600 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficient of the lens surface of the imaging lens group 60 of the sixth embodiment are listed in Table 15 and Table 16, respectively. In the sixth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Sixth embodiment EFL = 5.94 mm, Fno = 2.10, HFOV = 25 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 61a Spherical Infinity 0.500 1.581 60.7 -8.50 glass 61b Spherical 4.939 0.186 Second lens 62a Spherical 6.583 2.032 1.878 37.1 3.89 glass 62b Spherical -6.083 0.206 Third lens 63a Aspherical -108.429 0.768 1.509 63.5 -5.01 glass 63b Aspherical 2.618 1.333 Fourth lens 64a Spherical -16.389 1.854 1.972 28.3 6.10 glass 64b Spherical -4.596 0.732 Fifth lens 65a Spherical 14.328 0.960 1.791 41.0 29.80 glass 65b Spherical 35.430 0.300 Filter element 66a flat unlimited 0.400 1.508 64.2 glass 66b flat unlimited 3.545 Protective glass 67a flat unlimited 0.400 1.508 64.2 glass 67b flat unlimited 0.125 Imaging surface 68 flat unlimited Reference wavelength: 940 nm Table 15 Aspheric coefficients of the sixth embodiment surface 63a 63b K 2.48E+03 -5.22E+00 A ₄ -3.28E-02 -7.06E-03 A ₆ 3.86E-03 9.65E-04 A ₈ -4.59E-04 -5.82E-05 A ₁₀ 3.54E-05 1.11E-06 Table 16

In the sixth embodiment, the numerical values of the relational expressions of the imaging lens group 60 are listed in Table 17. It can be seen from Table 17 that the imaging lens group 60 of the sixth embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 1.030 f3/f1 0.589 TTL/ImgH 5.041 f2/EFL 0.655 R8/R7 0.280 CT4/TTL 0.139 (C9+C10)/(C9-C10) 2.358 CT5/TTL 0.072 Nd2 1.878 f4/EFL 1.026 f5/EFL 5.014 AT34/(AT12+AT23+AT45) 1.185 Table 17

Referring to FIG. 6B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 60, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.1mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 940nm) that the focal length change of the sagittal aberration in the entire field of view is within + 0.08mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.1mm; and the distortion aberration can be controlled within 5%. As shown in FIG. 6B, the imaging lens group 60 of this embodiment has well corrected various aberrations, which meets the imaging quality requirements of the optical system. Seventh embodiment

Referring to FIGS. 7A and 7B, FIG. 7A is a schematic diagram of an imaging lens group 70 according to a seventh embodiment of the present invention. FIG. 7B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the seventh embodiment of the present invention in order from left to right.

As shown in FIG. 7A, the imaging lens group 70 of the seventh embodiment includes an aperture ST, a first lens 71, a second lens 72, a third lens 73, a fourth lens 74, and a fifth lens in order from the object side to the image side. 75. The imaging lens group 70 can further include a filter element 76, a protective glass 77 and an imaging surface 78. An image sensing element 700 can be further provided on the imaging surface 78 to form an imaging device (not marked separately).

The first lens 71 has a negative refractive power, the object side surface 71a is convex, the image side surface 71b is concave, and the object side surface 71a and the image side surface 71b are spherical surfaces. The material of the first lens 71 is glass.

The second lens 72 has a positive refractive power, the object side 72a is convex, the image side 72b is convex, and both the object side 72a and the image side 72b are spherical. The material of the second lens 72 is glass.

The third lens 73 has a negative refractive power, its object side surface 73a is concave, its image side surface 73b is concave, and its object side surface 73a and image side surface 73b are spherical surfaces. The material of the third lens 73 is glass.

The fourth lens 74 has a positive refractive power, the object side 74a is concave, the image side 74b is convex, and both the object side 74a and the image side 74b are spherical. The material of the fourth lens 74 is glass.

The fifth lens 75 has a positive refractive power, the object side surface 75a is convex, the image side surface 75b is concave, and the object side surface 75a and the image side surface 75b are spherical surfaces. The material of the fifth lens 75 is glass.

The filter element 76 is disposed between the fifth lens 75 and the imaging surface 78 to filter out light in a specific wavelength range. Both surfaces 76a and 76b of the filter element 76 are flat surfaces, and the material is glass.

The protective glass 77 is disposed on the image sensing element 700, and its two surfaces 77a and 77b are flat surfaces, and the material is glass.

The image sensor 700 is, for example, a charge-coupled device (CCD) image sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data of the imaging lens group 70 of the seventh embodiment are listed in Table 18. Seventh embodiment EFL = 5.50 mm, Fno = 2.75, HFOV = 24 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 71a Spherical 6.814 0.500 1.524 60.3 -9.66 glass 71b Spherical 2.815 0.060 Second lens 72a Spherical 2.948 1.850 1.975 32.3 2.31 glass 72b Spherical -5.998 0.220 Third lens 73a Spherical -3.733 0.910 1.984 17.9 -2.09 glass 73b Spherical 4.703 0.370 Fourth lens 74a Spherical -6.997 2.000 1.816 46.5 8.71 glass 74b Spherical -3.947 0.100 Fifth lens 75a Spherical 5.780 0.960 1.800 47.5 7.63 glass 75b Spherical 139.800 0.300 Filter element 76a flat unlimited 0.400 1.517 64.2 glass 76b flat unlimited 2.072 Protective glass 77a flat unlimited 0.400 1.517 64.2 glass 77b flat unlimited 0.125 Imaging surface 78 flat unlimited Reference wavelength: 588 nm Table 18

In the seventh embodiment, the numerical values of the relational expressions of the imaging lens group 70 are listed in Table 19. It can be seen from Table 19 that the imaging lens group 70 of the seventh embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 0.539 f3/f1 0.216 TTL/ImgH 4.289 f2/EFL 0.419 R8/R7 0.564 CT4/TTL 0.195 (C9+C10)/(C9-C10) 1.086 CT5/TTL 0.094 Nd2 1.975 f4/EFL 1.585 f5/EFL 1.388 AT34/(AT12+AT23+AT45) 0.975 Table 19

Referring to FIG. 7B, from left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 70 are respectively shown from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 486nm, 588nm, and 656nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.04mm. From the astigmatic field curvature aberration diagram (wavelength 588nm), it can be seen that the focal length change of the sagittal aberration in the entire field of view is within + 0.06mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.06mm; and the distortion aberration can be controlled within 3%. As shown in FIG. 7B, the imaging lens assembly 70 of this embodiment has well corrected various aberrations, which meets the imaging quality requirements of the optical system. Eighth embodiment

Referring to FIGS. 8A and 8B, FIG. 8A is a schematic diagram of an imaging lens group 80 according to an eighth embodiment of the present invention. FIG. 8B is a longitudinal spherical aberration map (Longitudinal Spherical Aberration), an astigmatism/Field Curvature map (Astigmatism/Field Curvature), and a distortion aberration map (Distortion) of the eighth embodiment of the present invention in order from left to right.

As shown in FIG. 8A, the imaging lens group 80 of the eighth embodiment includes an aperture ST, a first lens 81, a second lens 82, a third lens 83, a fourth lens 84, and a fifth lens in sequence from the object side to the image side. 85. The imaging lens group 80 can further include a filter element 86, a protective glass 87 and an imaging surface 88. An image sensing element 800 can be further provided on the imaging surface 88 to form an imaging device (not marked separately).

The first lens 81 has a negative refractive power, the object side surface 81a is convex, the image side surface 81b is concave, and the object side surface 81a and the image side surface 81b are spherical surfaces. The material of the first lens 81 is glass.

The second lens 82 has a positive refractive power, the object side surface 82a is convex, the image side surface 82b is convex, and both the object side surface 82a and the image side surface 82b are spherical surfaces. The material of the second lens 82 is glass.

The third lens 83 has a negative refractive power, its object side surface 83a is convex (convex at the paraxial position and concave surface off the axis), its image side surface 83b is concave, and its object side surface 83a and image side surface 83b are both aspherical . The material of the third lens 83 is glass.

The fourth lens 84 has a positive refractive power, the object side surface 84a is a concave surface, the image side surface 84b is a convex surface, and the object side surface 84a and the image side surface 84b are both spherical surfaces. The material of the fourth lens 84 is glass.

The fifth lens 85 has a positive refractive power, the object side surface 85a is convex, the image side surface 85b is concave, and the object side surface 85a and the image side surface 85b are spherical surfaces. The material of the fifth lens 85 is glass.

The filter element 86 is disposed between the fifth lens 85 and the imaging surface 88 to filter out light in a specific wavelength range. Both surfaces 86a and 86b of the filter element 86 are flat surfaces, and the material is glass.

The protective glass 87 is disposed on the image sensor 800, and its two surfaces 87a and 87b are flat surfaces, and the material is glass.

The image sensor 800 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficient of the lens surface of the imaging lens group 80 of the eighth embodiment are listed in Table 20 and Table 21, respectively. In the eighth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Eighth embodiment EFL = 5.76 mm, Fno = 2.09, HFOV = 27 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 81a Spherical 67.449 0.300 1.602 58.6 -8.93 glass 81b Spherical 4.974 0.254 Second lens 82a Spherical 8.264 1.333 1.792 41.1 4.63 glass 82b Spherical -6.118 0.255 Third lens 83a Aspherical 34.416 0.950 1.502 63.4 -6.00 glass 83b Aspherical 2.742 1.329 Fourth lens 84a Spherical -12.916 1.672 2.090 17.3 5.79 glass 84b Spherical -4.523 0.807 Fifth lens 85a Spherical 15.441 0.864 1.678 30.1 28.63 glass 85b Spherical 73.721 0.300 Filter element 86a flat unlimited 0.400 1.508 64.2 glass 86b flat unlimited 3.927 Protective glass 87a flat unlimited 0.400 1.508 64.2 glass 87b flat unlimited 0.125 Imaging surface 88 flat unlimited Reference wavelength: 940 nm Table Twenty Aspheric coefficients of the eighth embodiment surface 83a 83b K 1.82E+02 -4.95E+00 A ₄ -3.15E-02 -7.84E-03 A ₆ 3.40E-03 8.58E-04 A ₈ -5.77E-04 -6.00E-05 A ₁₀ 3.89E-05 2.04E-06 Table 21

In the eighth embodiment, the numerical values of the relational expressions of the imaging lens group 80 are listed in Table 22. It can be seen from Table 22 that the imaging lens group 80 of the eighth embodiment satisfies the requirements of relational expressions (1) to (12). f12/EFL 1.438 f3/f1 0.672 TTL/ImgH 4.629 f2/EFL 0.803 R8/R7 0.350 CT4/TTL 0.129 (C9+C10)/(C9-C10) 1.530 CT5/TTL 0.067 Nd2 1.792 f4/EFL 1.004 f5/EFL 4.969 AT34/(AT12+AT23+AT45) 1.010 Table 22

Referring to FIG. 8B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 80, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 940nm) that the focal length change of the sagittal aberration in the entire field of view is within + 0.06mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.05mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 8B, the imaging lens assembly 80 of this embodiment has well corrected various aberrations, which meets the imaging quality requirements of the optical system. Ninth embodiment

Referring to FIGS. 9A and 9B, FIG. 9A is a schematic diagram of an imaging lens group 90 according to a ninth embodiment of the present invention. Fig. 9B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the ninth embodiment of the present invention in order from left to right.

As shown in FIG. 9A, the imaging lens group 90 of the ninth embodiment includes an aperture ST, a first lens 91, a second lens 92, a third lens 93, a fourth lens 94, and a fifth lens in order from the object side to the image side. 95. The imaging lens group 90 can further include a filter element 96, a protective glass 97 and an imaging surface 98. An image sensing element 900 can be further provided on the imaging surface 98 to form an imaging device (not marked separately).

The first lens 91 has a negative refractive power, the object side 91a is concave, the image side 91b is concave, and the object side 91a and the image side 91b are both spherical. The material of the first lens 91 is glass.

The second lens 92 has a positive refractive power, the object side surface 92a is convex, the image side surface 92b is convex, and the object side surface 92a and the image side surface 92b are spherical surfaces. The material of the second lens 92 is glass.

The third lens 93 has a negative refractive power. Its object side surface 93a is convex (convex at the paraxial position and concave surface off-axis), its image side surface 93b is concave, and its object side surface 93a and image side surface 93b are aspherical. . The material of the third lens 93 is glass.

The fourth lens 94 has a positive refractive power, the object side surface 94a is concave, the image side surface 94b is convex, and the object side surface 94a and the image side surface 94b are spherical surfaces. The material of the fourth lens 94 is glass.

The fifth lens 95 has a positive refractive power, the object side 95a is convex, the image side 95b is convex, and both the object side 95a and the image side 95b are spherical surfaces. The material of the fifth lens 95 is glass.

The filter element 96 is disposed between the fifth lens 95 and the imaging surface 98 to filter out light in a specific wavelength range. Both surfaces 96a and 96b of the filter element 96 are flat surfaces, and the material is glass.

The protective glass 97 is disposed on the image sensor element 900, and its two surfaces 97a, 97b are flat surfaces, and the material is glass.

The image sensor (Image Sensor) 900 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficients of the lens surface of the imaging lens group 90 of the ninth embodiment are listed in Table 23 and Table 24, respectively. In the ninth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Ninth embodiment EFL = 5.78 mm, Fno = 2.09, HFOV = 26.5 deg surface Surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient Focal length (mm) Material Subject flat unlimited unlimited aperture ST 0.000 First lens 91a Spherical -1843.673 0.571 1.600 56.5 -9.80 glass 91b Spherical 5.898 0.160 Second lens 92a Spherical 11.724 0.826 1.927 32.3 4.54 glass 92b Spherical -6.345 0.258 Third lens 93a Aspherical 29.754 0.684 1.554 60.8 -6.00 glass 93b Aspherical 2.968 1.155 Fourth lens 94a Spherical -10.666 1.638 1.973 26.2 5.85 glass 94b Spherical -3.994 1.117 Fifth lens 95a Spherical 29.554 0.560 1.788 41.0 29.03 glass 95b Spherical -100.190 0.300 Filter element 96a flat flat 0.400 1.508 64.2 glass 96b flat flat 3.893 Protective glass 97a flat flat 0.400 1.508 64.2 glass 97b flat flat 0.125 Imaging surface 98 flat flat Reference wavelength: 940 nm Table 23 Aspheric coefficients of the ninth embodiment surface 93a 93b K 1.33E+02 -7.93E+00 A ₄ -4.03E-02 -8.81E-03 A ₆ 4.16E-03 7.31E-04 A ₈ -2.57E-04 -4.89E-05 A ₁₀ -6.20E-05 4.51E-06 Table 24

In the ninth embodiment, the numerical values of the relational expressions of the imaging lens group 90 are listed in Table 25. It can be seen from Table 25 that the imaging lens group 90 of the ninth embodiment meets the requirements of relational expressions (1) to (12). f12/EFL 1.353 f3/f1 0.612 TTL/ImgH 4.450 f2/EFL 0.788 R8/R7 0.374 CT4/TTL 0.136 (C9+C10)/(C9-C10) 0.544 CT5/TTL 0.046 Nd2 1.927 f4/EFL 1.015 f5/EFL 5.037 AT34/(AT12+AT23+AT45) 0.752 Table 25

Referring to FIG. 9B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the imaging lens group 90 respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared rays of 900nm, 940nm, 980nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. From the astigmatic field curvature aberration diagram (wavelength 940nm), it can be seen that the focal length change of the sagittal aberration in the entire field of view is within + 0.09mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.08mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 9B, the imaging lens group 90 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Tenth embodiment

The tenth embodiment of the present invention is an imaging device. The imaging device includes the imaging lens group of the aforementioned first to ninth embodiments, and an image sensing element. The image sensing element is, for example, a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensing element. This imaging device is, for example, a camera module for car photography, a camera module for portable electronic products, or a camera module for surveillance cameras. Eleventh embodiment

Please refer to FIG. 10, which is a schematic diagram of an electronic device 1000 according to an eleventh embodiment of the present invention. As shown in the figure, the electronic device 1000 includes an imaging device 1010 and a near-infrared emitting element 1020. The imaging device 1010 is, for example, the imaging device of the aforementioned tenth embodiment, and can be composed of the imaging lens group of the present invention and an image sensing element. The near-infrared emitting element 1020 is, for example, a near-infrared lamp, which emits a near-infrared beam with a wavelength of 940 nm. The electronic device 1000 is, for example, a driving monitoring device or a surveillance camera.

Although the present invention is described using the foregoing several embodiments, these embodiments are not intended to limit the scope of the present invention. For anyone familiar with the art, without departing from the spirit and scope of the present invention, various changes in form and details can still be made with reference to the contents of the embodiments disclosed in the present invention. Therefore, it should be understood here that the present invention is subject to the scope of the following patent applications. Any changes made within the scope of the patent application or its equivalent scope shall still fall into the application of the present invention. Within the scope of the patent.

10, 20, 30, 40, 50, 60, 70, 80, 90: imaging lens group 11, 21, 31, 41, 51, 61, 71, 81, 91: the first lens 12, 22, 32, 42, 52, 62, 72, 82, 92: second lens 13, 23, 33, 43, 53, 63, 73, 83, 93: third lens 14, 24, 34, 44, 54, 64, 74, 84, 94: fourth lens 15, 25, 35, 45, 55, 65, 75, 85, 95: fifth lens 16, 26, 36, 46, 56, 66, 76, 86, 96: filter element 17, 27, 37, 47, 57, 67, 77, 87, 97: protective glass 18, 28, 38, 48, 58, 68, 78, 88, 98: imaging surface 11a, 21a, 31a, 41a, 51a, 61a, 71a, 81a, 91a: the object side of the first lens 11b, 21b, 31b, 41b, 51b, 61b, 71b, 81b, 91b: the image side of the first lens 12a, 22a, 32a, 42a, 52a, 62a, 72a, 82a, 92a: the object side of the second lens 12b, 22b, 32b, 42b, 52b, 62b, 72b, 82b, 92b: the image side of the second lens 13a, 23a, 33a, 43a, 53a, 63a, 73a, 83a, 93a: the object side of the third lens 13b, 23b, 33b, 43b, 53b, 63b, 73b, 83b, 93b: the image side of the third lens 14a, 24a, 34a, 44a, 54a, 64a, 74a, 84a, 94a: the object side of the fourth lens 14b, 24b, 34b, 44b, 54b, 64b, 74b, 84b, 94b: the image side of the fourth lens 15a, 25a, 35a, 45a, 55a, 65a, 75a, 85a, 95a: the object side of the fifth lens 15b, 25b, 35b, 45b, 55b, 65b, 75b, 85b, 95b: the image side of the fifth lens 16a, 16b, 26a, 26b, 36a, 36b, 46a, 46b, 56a, 56b, 66a, 66b, 76a, 76b, 86a, 86b, 96a, 96b: the second surface of the filter element 17a, 17b, 27a, 27b, 37a, 37b, 47a, 47b, 57a, 57b, 67a, 67b, 77a, 77b, 87a, 87b, 97a, 97b: two surfaces of protective glass 100, 200, 300, 400, 500, 600, 700, 800, 900: image sensor 1000: Electronic device 1010: imaging device 1020: Near infrared emitting element I: Optical axis ST: Aperture

[FIG. 1A] is a schematic diagram of the imaging lens group of the first embodiment of the present invention; [Fig. 1B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the first embodiment of the present invention are shown in sequence; [FIG. 2A] is a schematic diagram of the imaging lens group of the second embodiment of the present invention; [FIG. 2B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the second embodiment of the present invention are shown in sequence; [FIG. 3A] is a schematic diagram of the imaging lens group of the third embodiment of the present invention; [FIG. 3B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the third embodiment of the present invention are shown in sequence; [FIG. 4A] is a schematic diagram of an imaging lens group according to a fourth embodiment of the present invention; [FIG. 4B] From left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the fourth embodiment of the present invention in order; [FIG. 5A] is a schematic diagram of the imaging lens group of the fifth embodiment of the present invention; [FIG. 5B] From left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the fifth embodiment of the present invention; [FIG. 6A] is a schematic diagram of the imaging lens group of the sixth embodiment of the present invention; [FIG. 6B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the sixth embodiment of the present invention are shown in sequence; [FIG. 7A] is a schematic diagram of the imaging lens group of the seventh embodiment of the present invention; [FIG. 7B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the seventh embodiment of the present invention are shown in sequence; [FIG. 8A] is a schematic diagram of the imaging lens group of the eighth embodiment of the present invention; [FIG. 8B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the eighth embodiment of the present invention are shown in sequence; [FIG. 9A] is a schematic diagram of the imaging lens group of the ninth embodiment of the present invention; [FIG. 9B] From left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the ninth embodiment of the present invention are shown in sequence; and [Figure 10] is a schematic diagram of an electronic device according to an eleventh embodiment of the present invention.

10: Imaging lens group

11: The first lens

12: second lens

13: The third lens

14: The fourth lens

15: Fifth lens

16: filter element

17: Protective glass

18: imaging surface

11a: Object side of the first lens

11b: The side of the image of the first lens

12a: Object side of the second lens

12b: The side of the image of the second lens

13a: The object side of the third lens

13b: The image side of the third lens

14a: Object side of the fourth lens

14b: The image side of the fourth lens

15a: The object side of the fifth lens

15b: The side of the image of the fifth lens

16a, 16b: The second surface of the filter element

17a, 17b: Protect the second surface of glass

100: Image sensor

I: Optical axis

ST: Aperture

Claims (19)

An imaging lens group, from the object side to the image side, sequentially includes: One aperture A first lens with negative refractive power and a concave image side surface; A second lens with positive refractive power; A third lens with negative refractive power; A fourth lens, a meniscus lens with positive refractive power, the object side is concave, and the image side is convex; and A fifth lens with positive refractive power and a convex object side surface; wherein the total number of lenses in the imaging lens group is five; the combined focal length of the first lens and the second lens is f12, and the imaging lens group is effective The focal length is EFL, which satisfies the following relationship: 0.5>f12/EFL>1.6. For example, the imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 0.2>f3/f1>0.7; Wherein, f1 is the focal length of the first lens and f3 is the focal length of the third lens. The imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group includes at least two lenses with a refractive index greater than 1.7. The imaging lens group of item 1 in the scope of patent application, wherein the refractive index of the second lens is Nd2, which satisfies the following relationship: Nd2>1.75. For example, the imaging lens group of the first item in the scope of patent application, wherein the object side and image side of the third lens are both aspherical, and the material of the third lens is glass. For example, the imaging lens group of item 1 of the scope of patent application, wherein the object side surface of the third lens is convex at the near optical axis. For example, the imaging lens group of the first item in the scope of the patent application, wherein the object side and the image side of the second lens are both convex. For example, the imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 3.8>TTL/ImgH>5.1; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis, and ImgH is the maximum image height of the imaging lens group. For example, the imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 0.4>f2/EFL>0.9; Among them, f2 is the focal length of the second lens. For example, the imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 0.9>f4/EFL>1.6; Among them, f4 is the focal length of the fourth lens. For example, the imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 1.3>f5/EFL>6; Among them, f5 is the focal length of the fifth lens. For example, the imaging lens group of item 1 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 0.7>AT34/(AT12+AT23+AT45)>4.3; Wherein, AT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, and AT34 is the distance on the optical axis. The distance from the image side of the third lens to the object side of the fourth lens on the optical axis, and AT45 is the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis. An imaging lens group, from the object side to the image side, sequentially includes: One aperture A first lens with negative refractive power and a concave image side surface; A second lens having positive refractive power, wherein the combined focal length of the first lens and the second lens is a positive value; A third lens with negative refractive power; A fourth lens with positive refractive power, its object side surface is concave, and its image side surface is convex; and A fifth lens with positive refractive power and a convex object side surface; the total number of lenses in the imaging lens group is five; the focal length of the second lens is f2, the effective focal length of the imaging lens group is EFL, and the first lens The distance from the object side to the imaging surface of the imaging lens group on the optical axis is TTL, and the maximum image height of the imaging lens group is ImgH; the imaging lens group satisfies the following relationship: 0.4>f2/EFL>0.9; and 3.8>TTL/ImgH>5.1. For example, the imaging lens group of item 1 or item 13 of the scope of patent application, wherein the fourth lens satisfies the following relationship: 0.25>R8/R7>0.6; Wherein, R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. For example, the imaging lens group of item 14 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 0.11>CT4/TTL>0.19; Wherein, CT4 is the thickness of the fourth lens, and TTL is the distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis. For example, the imaging lens group of item 1 or item 13 of the scope of patent application, wherein the curvature of the fifth lens object side is C9, and the curvature of the image side is C10, and the following relationship is satisfied: 0.7>(C9+C10)/(C9-C10)>2.5. For example, the imaging lens group of item 16 in the scope of patent application, wherein the imaging lens group satisfies the following relationship: 0.03>CT5/TTL>0.1; Wherein, CT5 is the thickness of the fifth lens, and TTL is the distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis. An imaging device comprising the imaging lens group as claimed in item 1 or item 13 of the scope of patent application, and an image sensing element. An electronic device including the imaging device as claimed in item 18 of the scope of patent application.

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