CN109856781B - Optical lens set for imaging - Google Patents

Abstract

The present invention discloses an optical lens group for imaging, which includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens in order from the object side to the image side. The first lens has positive refractive power, and its object side surface is convex near the optical axis. The second lens has negative refractive power, and its object side surface is concave near the optical axis. The object side surface of the third lens is convex near the optical axis. The fourth lens has negative refractive power, and its image side surface is concave near the optical axis, and its image side surface has at least one convex surface off-axis, and its object side surface and image side surface are both aspherical. The object side surface and image side surface of the fifth lens are both aspherical. The optical lens group for imaging has five lenses, and there is an air gap between each two adjacent lenses on the optical axis.

Description

Optical lens set for imaging

This application is a divisional application, the application date of the original application is: January 13, 2016; the application number is: 201610020537.3; the name of the invention is: optical lens group for imaging, imaging device and electronic device.

technical field

The present invention relates to an optical lens group for imaging.

Background technique

With the vigorous development of miniaturized camera lenses, the demand for miniature image acquisition modules is increasing day by day, and the photosensitive elements of general camera lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (Complementary Metal Semiconductor) -Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor technology, the pixel size of the photosensitive element has been reduced, and the current electronic products have a trend of good functions and light, thin and short appearance. Therefore, it has good The miniaturized camera lens with imaging quality has become the mainstream in the current market.

In recent years, optical lenses with telephoto characteristics have been gradually mounted on thin and light high-end electronic products to meet the various demands of high-end electronic products in terms of pixels and imaging quality. However, traditional telephoto lenses have disadvantages such as too long total length, too small aperture, poor imaging quality and too large size, which make it difficult to meet the needs of high-standard electronic products. Therefore, it is one of the problems that the industry is eager to solve at present to provide an optical system with telephoto characteristics and at the same time meeting the requirements of high imaging quality.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an imaging optical lens group, wherein the fourth lens has a negative refractive power. In addition, the image-side surface of the fourth lens has at least one convex surface off-axis, which can suppress the chief ray angle (CRA) around the image, so that the photosensitive element can capture the image more clearly. When certain conditions are met, it is helpful to slow down the change of the peripheral shape of the second lens, and avoid excessive stray light due to excessive curvature of the surface of the second lens. In addition, it is helpful to properly match the refractive power of the second lens and the fourth lens, so as to prevent the shape of the second lens from changing too much. Furthermore, it contributes to improving the telephoto characteristics of the imaging optical lens group.

The present invention provides an imaging optical lens group, which includes 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. The first lens has a positive refractive power, and its object-side surface is convex at the near optical axis. The second lens has a negative refractive power, and its object-side surface is concave at the near optical axis. The object-side surface of the third lens is convex at the near optical axis, and both the object-side surface and the image-side surface of the third lens are aspherical. The fourth lens has a negative refractive power, its object-side surface is concave at the near-optical axis, its image-side surface is concave at the near-optical axis, its image-side surface has at least one convex surface off-axis, and its object-side surface is concave at the near-optical axis. The image side surfaces are all aspherical. The fifth lens has a positive refractive power, and both the object side surface and the image side surface are aspherical. The total number of lenses in the imaging optical lens group is five, and each two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens have an air gap on the optical axis. The curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, the dispersion coefficient of the fourth lens is V4, the dispersion coefficient of the fifth lens is V5, and the focal length of the second lens is f2, The focal length of the fourth lens is f4, which satisfies the following conditions:

(R3+R4)/(R3-R4)<0.50;

1.8<V4/V5<3.5; and

f4/f2<1.0.

The present invention further provides an imaging optical lens group, which includes 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. The first lens has a positive refractive power, and its object-side surface is convex at the near optical axis. The second lens has a negative refractive power, and its object-side surface is concave at the near optical axis. Both the object-side surface and the image-side surface of the third lens are aspherical. The fourth lens has a negative refractive power, its object-side surface is concave at the near-optical axis, its image-side surface is concave at the near-optical axis, its image-side surface has at least one convex surface off-axis, and its object-side surface is concave at the near-optical axis. The image side surfaces are all aspherical. The fifth lens has a positive refractive power, and both the object side surface and the image side surface are aspherical. The total number of lenses in the imaging optical lens group is five, and each two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens have an air gap on the optical axis. The curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, the dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which satisfy the following conditions:

(R3+R4)/(R3-R4)≤-0.30; and

1.8<V4/V5<3.5.

The present invention also provides an imaging optical lens group, which includes 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. The first lens has a positive refractive power, its object-side surface is convex at the near-optical axis, and its image-side surface is concave at the near-optical axis. The second lens has a negative refractive power, and its object-side surface is concave at the near optical axis. Both the object-side surface and the image-side surface of the third lens are aspherical. The fourth lens has a negative refractive power, its object-side surface is concave at the near-optical axis, its image-side surface is concave at the near-optical axis, its image-side surface has at least one convex surface off-axis, and its object-side surface is concave at the near-optical axis. The image side surfaces are all aspherical. The fifth lens has a positive refractive power, and both the object side surface and the image side surface are aspherical. The total number of lenses in the imaging optical lens group is five, and each two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens have an air gap on the optical axis. The radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the maximum imaging height of the imaging optical lens group is 1 mgH, and the focal length of the imaging optical lens group is f, which satisfies the following conditions :

(R3+R4)/(R3-R4)<0.50; and

0.25<ImgH/f<0.55.

When (R3+R4)/(R3-R4) satisfies the above conditions, it is helpful to slow down the change of the peripheral shape of the second lens, and avoid excessive stray light caused by excessive curvature of the surface of the second lens.

When V4/V5 meets the above conditions, it helps to correct chromatic aberration.

When f4/f2 satisfies the above-mentioned conditions, it is helpful to make the refractive power of the second lens and the fourth lens properly match, so as to avoid the shape of the second lens from changing too much.

When ImgH/f satisfies the above conditions, it helps to improve the telephoto characteristics of the imaging optical lens group.

The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

Description of drawings

FIG. 1 is a schematic diagram of an imaging device according to a first embodiment of the present invention;

FIG. 2 is a graph of spherical aberration, astigmatism and distortion of the first embodiment from left to right;

FIG. 3 is a schematic diagram of an imaging device according to a second embodiment of the present invention;

FIG. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment from left to right;

FIG. 5 is a schematic diagram of an imaging device according to a third embodiment of the present invention;

FIG. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment in sequence from left to right;

7 is a schematic diagram of an imaging device according to a fourth embodiment of the present invention;

FIG. 8 is a graph of spherical aberration, astigmatism and distortion of the fourth embodiment from left to right;

FIG. 9 is a schematic diagram of an imaging device according to a fifth embodiment of the present invention;

FIG. 10 is a graph of spherical aberration, astigmatism and distortion of the fifth embodiment from left to right;

FIG. 11 is a schematic diagram of an imaging device according to a sixth embodiment of the present invention;

FIG. 12 is a graph of spherical aberration, astigmatism and distortion of the sixth embodiment from left to right;

FIG. 13 is a schematic diagram of an imaging device according to a seventh embodiment of the present invention;

FIG. 14 is a graph of spherical aberration, astigmatism and distortion of the seventh embodiment in order from left to right;

FIG. 15 is a schematic diagram of an imaging device according to an eighth embodiment of the present invention;

FIG. 16 is a graph of spherical aberration, astigmatism and distortion of the eighth embodiment from left to right;

17 is a schematic diagram of an electronic device according to the present invention;

FIG. 18 is a schematic diagram of another electronic device according to the present invention;

FIG. 19 is a schematic diagram of yet another electronic device according to the present invention.

Among them, reference numerals:

Image acquisition device: 10

Aperture: 100, 200, 300, 400, 500, 600, 700, 800

The first lens: 110, 210, 310, 410, 510, 610, 710, 810

Object side surface: 111, 211, 311, 411, 511, 611, 711, 811

Image side surface: 112, 212, 312, 412, 512, 612, 712, 812

Second lens: 120, 220, 320, 420, 520, 620, 720, 820

Object side surface: 121, 221, 321, 421, 521, 621, 721, 821

Image side surface: 122, 222, 322, 422, 522, 622, 722, 822

Third lens: 130, 230, 330, 430, 530, 630, 730, 830

Object side surface: 131, 231, 331, 431, 531, 631, 731, 831

Image side surface: 132, 232, 332, 432, 532, 632, 732, 832

Fourth lens: 140, 240, 340, 440, 540, 640, 740, 840

Object side surface: 141, 241, 341, 441, 541, 641, 741, 841

Image side surface: 142, 242, 342, 442, 542, 642, 742, 842

Fifth lens: 150, 250, 350, 450, 550, 650, 750, 850

Object side surface: 151, 251, 351, 451, 551, 651, 751, 851

Image side surface: 152, 252, 352, 452, 552, 652, 752, 852

Infrared filter filter element: 160, 260, 360, 460, 560, 660, 760, 860

Imaging surface: 170, 270, 370, 470, 570, 670, 770, 870

Electronic photosensitive element: 180, 280, 380, 480, 580, 680, 780, 880

BL: The distance from the image side surface of the fifth lens to the imaging surface on the optical axis

Fno: Aperture value of the optical lens group for imaging

f: The focal length of the optical lens group for imaging

f2: The focal length of the second lens

f3: The focal length of the third lens

f4: Focal length of the fourth lens

HFOV: Half of the maximum angle of view in an optical lens set for imaging

ImgH: Maximum imaging height of the imaging optical lens group

R3: Radius of curvature of the object-side surface of the second lens

R4: Radius of curvature of the image-side surface of the second lens

R7: Radius of curvature of the object-side surface of the fourth lens

R8: Radius of curvature of the image-side surface of the fourth lens

R10: Radius of curvature of the image-side surface of the fifth lens

TL: The distance from the object side surface of the first lens to the imaging surface on the optical axis

T12: The separation distance between the first lens and the second lens on the optical axis

T23: The distance between the second lens and the third lens on the optical axis

T34: The distance between the third lens and the fourth lens on the optical axis

T45: The distance between the fourth lens and the fifth lens on the optical axis

V1: Dispersion coefficient of the first lens

V2: Dispersion coefficient of the second lens

V3: Dispersion coefficient of the third lens

V4: Dispersion coefficient of the fourth lens

V5: Dispersion coefficient of the fifth lens

Detailed ways

Below in conjunction with accompanying drawing, structure principle and working principle of the present invention are described in detail:

The imaging optical lens group includes 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 total number of lenses in the imaging optical lens group is five.

Each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens has an air space between two adjacent lenses on the optical axis, that is, the first lens, the second lens, the third lens, The fourth lens and the fifth lens may be five single non-cemented (non-bonded) lenses. Since the process of the cemented lens is more complicated than that of the non-cemented lens, especially the cemented surface of the two lenses needs to have a high-precision curved surface in order to achieve a high degree of closeness when the two lenses are cemented. Tilt-shift defects affect the overall optical imaging quality. Therefore, the first lens to the fifth lens in the image capturing lens group can be configured with five single non-cemented lenses, thereby effectively improving the problems caused by the cemented lens.

The first lens has a positive refractive power, and its object-side surface is convex at the near optical axis. Thereby, a sufficient positive refractive power of the imaging optical lens group can be provided, and the overall length of the imaging optical lens group can be shortened.

The second lens has a negative refractive power, and its object-side surface is concave at the near optical axis. Thereby, the aberration generated by the first lens can be corrected to improve the imaging quality.

The object-side surface of the third lens may have at least one concave surface off-axis, and the image-side surface of the third lens may also have at least one concave surface off-axis. In this way, the angle at which the light in the off-axis field of view is incident on the photosensitive element can be suppressed, so as to increase the receiving efficiency of the image photosensitive element and further correct the aberration of the off-axis field of view.

The fourth lens has a negative refractive power, its object-side surface is concave at the near-optical axis, and its image-side surface is concave at the near-optical axis. This contributes to shortening the back focal length of the imaging optical lens group. In addition, the image-side surface of the fourth lens has at least one convex surface off-axis, which can suppress the chief ray angle around the image, so that the photosensitive element can capture the image more clearly.

The fifth lens has a positive refractive power, its object-side surface can be convex along the paraxial axis, and its image-side surface can be convex along the paraxial axis. Thereby, the aberrations caused by the excessively strong refractive power of the first lens to the fourth lens can be corrected.

The curvature radius of the object-side surface of the second lens is R3, and the curvature radius of the image-side surface of the second lens is R4, which satisfy the following conditions: (R3+R4)/(R3-R4)<0.50. Thereby, it is helpful to slow down the change of the peripheral shape of the second lens, and avoid excessive stray light caused by excessive curvature of the surface of the second lens. Preferably, it can further satisfy the following conditions: (R3+R4)/(R3-R4)<0. More preferably, it can further satisfy the following condition: -2.5<(R3+R4)/(R3-R4)<0.

The focal length of the imaging optical lens group is f, and the curvature radius of the image-side surface of the fifth lens is R10, which satisfies the following condition: f/|R10|<1.20. In this way, it is helpful to provide an appropriate back focal length of the optical lens group for imaging, and avoid excessively long or too short back focal length caused by excessive curvature of the surface of the fifth lens. In detail, when the image-side surface of the fifth lens is convex at the near optical axis, the above conditions can prevent the back focal length from being excessively elongated. When the image-side surface of the fifth lens is concave at the near optical axis, the above conditions can avoid excessive shortening of the back focal length. Preferably, it can further satisfy the following condition: f/|R10|<0.75.

The maximum imaging height of the imaging optical lens group (that is, half of the total diagonal length of the effective sensing area of the electronic photosensitive element) is ImgH, and the focal length of the imaging optical lens group is f, which meets the following conditions: 0.25<ImgH/f< 0.55. This contributes to improving the telephoto characteristics of the imaging optical lens group.

The distance between the first lens and the second lens on the optical axis is T12, the distance between the second lens and the third lens on the optical axis is T23, and the distance between the third lens and the fourth lens on the optical axis is T34 , the separation distance between the fourth lens and the fifth lens on the optical axis is T45, which can satisfy the following conditions: 1.0<T34/(T12+T23+T45)<4.0. In this way, it is helpful to obtain a suitable distribution of the spacing distance between each two adjacent lenses, so as to reduce the sensitivity of the imaging optical lens group, and at the same time, the imaging optical lens group also has a telephoto function.

The focal length of the second lens is f2, and the focal length of the fourth lens is f4, which can satisfy the following condition: f4/f2<1.0. Therefore, it is helpful to properly match the refractive power of the second lens and the fourth lens, so as to prevent the shape of the second lens from changing too much.

The dispersion coefficient of the first lens is V1, the dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, the dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which can satisfy the following conditions : 0.45<(V2+V3+V5)/(V1+V4)<0.75. Thereby, a good balance can be achieved between chromatic aberration correction and astigmatism correction.

The distance between the third lens and the fourth lens on the optical axis is T34, and the distance from the image side surface of the fifth lens to an imaging surface on the optical axis is BL, which can satisfy the following conditions: 1.20<T34/BL<2.5. Thereby, the distribution and change of the angle of the chief ray of the image can be controlled, so as to effectively improve the receiving efficiency of the image sensor.

The curvature radius of the object-side surface of the fourth lens is R7, and the curvature radius of the image-side surface of the fourth lens is R8, which can satisfy the following conditions: -1.0<R7/R8<0. Thereby, the curvature radii of the object-side surface and the image-side surface of the fourth lens contribute to further shortening the back focal length of the imaging optical lens group.

The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the focal length of the imaging optical lens group is f, which can satisfy the following conditions: 0.75<TL/f<1.10. Thereby, the total length of the imaging optical lens group can be shortened, and at the same time, the imaging optical lens group can have telephoto characteristics.

The focal length of the imaging optical lens group is f, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, which can satisfy the following conditions: -4.0<(f/f2)+( f/f3)+(f/f4)<-2.0. Thereby, it is helpful to correct the image curvature caused by the first lens.

The separation distance between the first lens and the second lens on the optical axis is T12, and the separation distance between the second lens and the third lens on the optical axis is T23, which can satisfy the following conditions: 0<T23/T12<1.75. In this way, it can be avoided that the distance between the first lens and the second lens is too short, which helps to reduce the difficulty of assembly and improve the yield of assembly.

The dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which can satisfy the following conditions: 1.8<V4/V5<3.5. Thereby, it contributes to correction of chromatic aberration.

The focal length of the imaging optical lens group is f, and the focal length of the third lens is f3, which can satisfy the following conditions: -1.2<f/f3≦0. In this way, the effect of aberration correction can be effectively enhanced to improve image quality.

In the optical lens assembly for imaging disclosed in the present invention, the configuration of the aperture may be a front aperture or a central aperture. The front aperture means that the aperture is arranged between the subject and the first lens, and the middle aperture means that the aperture is arranged between the first lens and the imaging surface. If the aperture is a front aperture, the exit pupil (Exit Pupil) of the imaging optical lens group and the imaging surface can have a longer distance, so that it has a telecentric (Telecentric) effect, and the CCD or CMOS of the electronic photosensitive element can be added. The efficiency of receiving images; if it is a central aperture, it will help to expand the field of view of the imaging optical lens group, so that the imaging optical lens group has the advantages of a wide-angle lens.

In the optical lens assembly for imaging disclosed in the present invention, the material of the lens can be plastic or glass. When the material of the lens is glass, the degree of freedom in the configuration of the refractive power can be increased. In addition, when the lens material is plastic, the production cost can be effectively reduced. In addition, an aspherical surface (ASP) can be arranged on the surface of the lens, and the aspherical surface can be easily made into a shape other than a spherical surface, and more control variables can be obtained to reduce aberrations, thereby reducing the number of required lenses, so it can effectively Reduce the overall length of the imaging optical lens set.

In the imaging optical lens set disclosed in the present invention, if the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located at the near optical axis of the lens surface; if the surface of the lens is concave and the position of the concave surface is not defined, then Indicates that the concave surface can be located near the optical axis of the lens surface. If the refractive power or focal length of the lens does not define its regional position, it means that the refractive power or focal length of the lens can be the refractive power or focal length of the lens at the near optical axis.

In the imaging optical lens set disclosed in the present invention, the imaging surface of the imaging optical lens set can be a flat surface or a curved surface with any curvature according to the difference of the corresponding electronic photosensitive elements, especially the concave surface facing the object side. surface.

In the imaging optical lens group disclosed in the present invention, at least one diaphragm can be provided, and its position can be set before the first lens, between each lens or after the last lens. The type of the diaphragm is such as a flare diaphragm. (Glare Stop) or field stop (Field Stop) to reduce stray light and help improve image quality.

The present invention further provides an imaging device, which includes the aforementioned imaging optical lens group and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging optical lens group. Preferably, the image capturing device may further include a lens barrel, a holding device (Holder Member) or a combination thereof.

Referring to FIGS. 17 , 18 and 19 , the imaging device 10 can be applied in various aspects such as smart phones (as shown in FIG. 17 ), tablet computers (as shown in FIG. 18 ) and wearable devices (as shown in FIG. 19 ). Preferably, the electronic device may further include a control unit, a display unit, a storage unit, a random access memory (RAM) or a combination thereof.

The imaging optical lens assembly of the present invention can be applied to the optical system of moving focus according to the requirements, and has the characteristics of excellent aberration correction and good imaging quality. The present invention can also be applied to electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, driving recorders, reversing developing devices, somatosensory game consoles and wearable devices. middle. The aforementioned electronic device is only an example to illustrate the practical application of the present invention, and does not limit the scope of application of the imaging device of the present invention.

According to the above-mentioned embodiments, specific embodiments are provided below and described in detail with reference to the accompanying drawings.

<First Embodiment>

Please refer to FIG. 1 and FIG. 2 , wherein FIG. 1 is a schematic diagram of the imaging device according to the first embodiment of the present invention, and FIG. 2 is the spherical aberration, astigmatism and distortion curves of the first embodiment from left to right. As can be seen from FIG. 1 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 180 . The imaging optical lens group sequentially includes an aperture 100, a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and an infrared filter element (IR filter element) from the object side to the image side. -cut Filter) 160 and imaging plane 170. The electronic photosensitive element 180 is disposed on the imaging surface 170 . The lenses (110-150) of the imaging optical lens group are five. Each of the first lens 110 , the second lens 120 , the third lens 130 , the fourth lens 140 and the fifth lens 150 has an air space between two adjacent lenses on the optical axis.

The first lens 110 has positive refractive power and is made of plastic material. The object-side surface 111 is convex at the near optical axis, the image-side surface 112 is concave at the near optical axis, and both surfaces are aspherical.

The second lens 120 has a negative refractive power and is made of plastic material. The object-side surface 121 is concave at the near optical axis, the image-side surface 122 is convex at the near optical axis, and both surfaces are aspherical.

The third lens 130 is made of plastic material, its object-side surface 131 is flat at the near-optical axis, its image-side surface 132 is flat at the near-optical axis, both surfaces are aspherical, and its object-side surface 131 is off-axis There is at least one concave surface at the position, and the image side surface 132 has at least one concave surface at off-axis.

The fourth lens 140 has a negative refractive power and is made of plastic material. Its object-side surface 141 is concave at the near-optical axis, and its image-side surface 142 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 142 has at least one convex surface off-axis.

The fifth lens 150 has a positive refractive power and is made of plastic material. The object-side surface 151 is convex at the near-optical axis, the image-side surface 152 is flat at the near-optical axis, and both surfaces are aspherical.

The infrared filter element 160 is made of glass, which is disposed between the fifth lens 150 and the imaging surface 170 and does not affect the focal length of the optical imaging lens group.

The curve equations of the aspheric surfaces of the above-mentioned lenses are expressed as follows:

；

;

in:

X: the relative distance between the point on the aspheric surface whose distance from the optical axis is Y, and the tangent plane tangent to the intersection point on the optical axis of the aspheric surface;

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

R: radius of curvature;

k: cone coefficient; and

Ai: i-th order aspheric coefficient.

In the imaging optical lens group of the first embodiment, the focal length of the imaging optical lens group is f, the aperture value (F-number) of the imaging optical lens group is Fno, and the half of the maximum angle of view in the imaging optical lens group is HFOV. , whose values are as follows: f=6.29 millimeters (mm), Fno=3.00, HFOV=24.9 degrees (deg.).

The dispersion coefficient of the first lens 110 is V1, the dispersion coefficient of the second lens 120 is V2, the dispersion coefficient of the third lens 130 is V3, the dispersion coefficient of the fourth lens 140 is V4, and the dispersion coefficient of the fifth lens 150 is V5, It satisfies the following condition: (V2+V3+V5)/(V1+V4)=0.54.

The dispersion coefficient of the fourth lens 140 is V4, and the dispersion coefficient of the fifth lens 150 is V5, which satisfy the following condition: V4/V5=2.75.

The distance between the first lens 110 and the second lens 120 on the optical axis is T12, and the distance between the second lens 120 and the third lens 130 on the optical axis is T23, which satisfy the following conditions: T23/T12=0.32.

The separation distance between the first lens 110 and the second lens 120 on the optical axis is T12, the separation distance between the second lens 120 and the third lens 130 on the optical axis is T23, and the third lens 130 and the fourth lens 140 are on the optical axis. The separation distance above is T34, and the separation distance between the fourth lens 140 and the fifth lens 150 on the optical axis is T45, which satisfies the following condition: T34/(T12+T23+T45)=2.73.

The distance between the third lens 130 and the fourth lens 140 on the optical axis is T34, and the distance between the image side surface 152 of the fifth lens 152 and the imaging surface 170 on the optical axis is BL, which satisfies the following conditions: T34/BL=1.84.

The distance on the optical axis from the object-side surface 111 of the first lens to the imaging surface 170 is TL, and the focal length of the imaging optical lens group is f, which satisfies the following condition: TL/f=0.89.

The maximum imaging height of the imaging optical lens group is ImgH, and the focal length of the imaging optical lens group is f, which satisfies the following condition: ImgH/f=0.47.

The curvature radius of the object-side surface 121 of the second lens is R3, and the curvature radius of the image-side surface 122 of the second lens is R4, which satisfy the following conditions: (R3+R4)/(R3-R4)=-1.15.

The radius of curvature of the object-side surface 141 of the fourth lens is R7, and the radius of curvature of the image-side surface 142 of the fourth lens is R8, which satisfy the following condition: R7/R8=−0.06.

The focal length of the imaging optical lens group is f, and the curvature radius of the image-side surface 152 of the fifth lens is R10, which satisfies the following condition: f/|R10|=0.

The focal length of the imaging optical lens group is f, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, and the focal length of the fourth lens 140 is f4, which satisfy the following conditions: (f/f2)+(f /f3)+(f/f4)=-2.55.

The focal length of the imaging optical lens group is f, and the focal length of the third lens 130 is f3, which satisfy the following condition: f/f3=0.

The focal length of the second lens 120 is f2, and the focal length of the fourth lens 140 is f4, which satisfy the following condition: f4/f2=0.80.

Please refer to Table 1 and Table 2 below.

Table 1 shows the detailed structural data of the first embodiment of FIG. 1 , wherein the units of curvature radius, thickness and focal length are millimeters (mm), and surfaces 0 to 14 represent the surfaces from the object side to the image side in sequence. Table 2 shows the aspheric surface data in the first embodiment, wherein k is the cone surface coefficient in the aspheric surface curve equation, and A4 to A16 represent the 4th to 16th order aspheric surface coefficients of each surface. In addition, the following tables of the embodiments are schematic diagrams and aberration curves corresponding to the embodiments, and the definitions of the data in the tables are the same as those in Tables 1 and 2 of the first embodiment, and are not repeated here.

<Second Embodiment>

Please refer to FIGS. 3 and 4 , wherein FIG. 3 is a schematic diagram of an imaging device according to a second embodiment of the present invention, and FIG. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment from left to right. As can be seen from FIG. 3 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 280 . The imaging optical lens group sequentially includes a first lens 210, an aperture 200, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, an infrared filter element 260, and a fifth lens 250 from the object side to the image side. Imaging plane 270 . The electronic photosensitive element 280 is disposed on the imaging surface 270 . The lenses (210-250) of the imaging optical lens group are five pieces. Each of the first lens 210 , the second lens 220 , the third lens 230 , the fourth lens 240 and the fifth lens 250 has an air space between two adjacent lenses on the optical axis.

The first lens 210 has a positive refractive power and is made of plastic material. The object-side surface 211 is convex at the near optical axis, the image-side surface 212 is convex at the near optical axis, and both surfaces are aspherical.

The second lens 220 has negative refractive power and is made of plastic material. The object-side surface 221 is concave at the near optical axis, the image-side surface 222 is flat at the near optical axis, and both surfaces are aspherical.

The third lens 230 has a negative refractive power and is made of plastic material. Its object-side surface 231 is concave at the near-optical axis, its image-side surface 232 is convex at the near-optical axis, and both surfaces are aspherical. The side surface 231 has at least one concave surface off-axis, and like the side surface 232 has at least one concave surface off-axis.

The fourth lens 240 has a negative refractive power and is made of plastic material. Its object-side surface 241 is concave at the near optical axis, and its image-side surface 242 is concave at the near optical axis. Both surfaces are aspherical. The side surface 242 has at least one convex surface off-axis.

The fifth lens 250 has positive refractive power and is made of plastic material. The object-side surface 251 is convex at the near optical axis, the image-side surface 252 is concave at the near optical axis, and both surfaces are aspherical.

The infrared filter element 260 is made of glass, which is disposed between the fifth lens 250 and the imaging surface 270 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 3 and Table 4 below.

In the second embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

<Third Embodiment>

Please refer to FIGS. 5 and 6 , wherein FIG. 5 is a schematic diagram of an imaging device according to a third embodiment of the present invention, and FIG. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment from left to right. As can be seen from FIG. 5 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 380 . The imaging optical lens group sequentially includes an aperture 300, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, an infrared filter element 360 and Imaging plane 370 . The electronic photosensitive element 380 is disposed on the imaging surface 370 . The lenses (310-350) of the imaging optical lens group are five. Each of the first lens 310 , the second lens 320 , the third lens 330 , the fourth lens 340 and the fifth lens 350 has an air space between two adjacent lenses on the optical axis.

The first lens 310 has a positive refractive power and is made of plastic material. The object-side surface 311 is convex at the near optical axis, the image-side surface 312 is concave at the near optical axis, and both surfaces are aspherical.

The second lens 320 has a negative refractive power and is made of plastic material. The object-side surface 321 is concave at the near optical axis, the image-side surface 322 is concave at the near optical axis, and both surfaces are aspherical.

The third lens 330 has a negative refractive power and is made of plastic material. Its object-side surface 331 is convex at the near optical axis, its image-side surface 332 is concave at the near optical axis, and both surfaces are aspherical. The side surface 331 has at least one concave surface off-axis, and like the side surface 332 has at least one concave surface off-axis.

The fourth lens 340 has a negative refractive power and is made of plastic material. Its object-side surface 341 is concave at the near-optical axis, and its image-side surface 342 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 342 has at least one convex surface off-axis.

The fifth lens 350 has a positive refractive power and is made of plastic material. The object-side surface 351 is convex at the near optical axis, the image-side surface 352 is concave at the near optical axis, and both surfaces are aspherical.

The material of the infrared filter element 360 is glass, which is disposed between the fifth lens 350 and the imaging surface 370 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 5 and Table 6 below.

In the third embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

<Fourth Embodiment>

Please refer to FIGS. 7 and 8 , wherein FIG. 7 is a schematic diagram of an imaging device according to a fourth embodiment of the present invention, and FIG. 8 shows spherical aberration, astigmatism and distortion curves of the fourth embodiment from left to right. As can be seen from FIG. 7 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 480 . The imaging optical lens group sequentially includes an aperture 400, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, an infrared filter element 460, and a fifth lens 450 from the object side to the image side. Imaging plane 470 . The electronic photosensitive element 480 is disposed on the imaging surface 470 . The lenses (410-450) of the imaging optical lens group are five. Each of the first lens 410 , the second lens 420 , the third lens 430 , the fourth lens 440 and the fifth lens 450 has an air space between two adjacent lenses on the optical axis.

The first lens 410 has a positive refractive power and is made of plastic material. The object-side surface 411 is convex at the near optical axis, the image-side surface 412 is concave at the near optical axis, and both surfaces are aspherical.

The second lens 420 has a negative refractive power and is made of plastic material. The object-side surface 421 is concave at the near optical axis, the image-side surface 422 is convex at the near optical axis, and both surfaces are aspherical.

The third lens 430 has a negative refractive power and is made of plastic material. Its object-side surface 431 is concave at the near-optical axis, and its image-side surface 432 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 431 has at least one concave surface off-axis, and like the side surface 432 has at least one concave surface off-axis.

The fourth lens 440 has a negative refractive power and is made of plastic material. Its object-side surface 441 is concave at the near-optical axis, and its image-side surface 442 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 442 has at least one convex surface off-axis.

The fifth lens 450 has a positive refractive power and is made of plastic material. The object-side surface 451 is convex at the near-optical axis, and the image-side surface 452 is convex at the near-optical axis. Both surfaces are aspherical.

The infrared filter element 460 is made of glass, which is disposed between the fifth lens 450 and the imaging surface 470 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 7 and Table 8 below.

In the fourth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

<Fifth Embodiment>

Please refer to FIGS. 9 and 10 , wherein FIG. 9 is a schematic diagram of an imaging device according to a fifth embodiment of the present invention, and FIG. 10 is a spherical aberration, astigmatism and distortion curve diagram of the fifth embodiment from left to right. As can be seen from FIG. 9 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 580 . The imaging optical lens group sequentially includes an aperture 500, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, an infrared filter element 560, and a fifth lens 550 from the object side to the image side. Imaging plane 570 . The electronic photosensitive element 580 is disposed on the imaging surface 570 . The lenses (510-550) of the imaging optical lens group are five. Each of the first lens 510 , the second lens 520 , the third lens 530 , the fourth lens 540 and the fifth lens 550 has an air space between two adjacent lenses on the optical axis.

The first lens 510 has a positive refractive power and is made of plastic material. The object-side surface 511 is convex at the near optical axis, the image-side surface 512 is convex at the near optical axis, and both surfaces are aspherical.

The second lens 520 has a negative refractive power and is made of plastic material. The object-side surface 521 is concave at the near optical axis, the image-side surface 522 is concave at the near optical axis, and both surfaces are aspherical.

The third lens 530 has a negative refractive power and is made of plastic material. Its object-side surface 531 is convex at the near-optical axis, and its image-side surface 532 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 531 has at least one concave surface off-axis, and like the side surface 532 has at least one concave surface off-axis.

The fourth lens 540 has a negative refractive power and is made of plastic material. Its object-side surface 541 is concave at the near optical axis, and its image-side surface 542 is concave at the near optical axis. Both surfaces are aspherical. The side surface 542 has at least one convex surface off-axis.

The fifth lens 550 has a positive refractive power and is made of plastic material. The object-side surface 551 is convex at the near optical axis, the image-side surface 552 is concave at the near optical axis, and both surfaces are aspherical.

The infrared filter element 560 is made of glass, which is disposed between the fifth lens 550 and the imaging surface 570 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 9 and Table 10 below.

In the fifth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

<Sixth Embodiment>

Please refer to FIG. 11 and FIG. 12 , wherein FIG. 11 is a schematic diagram of the imaging device according to the sixth embodiment of the present invention, and FIG. 12 is the spherical aberration, astigmatism and distortion curves of the sixth embodiment from left to right. As can be seen from FIG. 11 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 680 . The imaging optical lens group sequentially includes an aperture 600, a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, an infrared filter element 660, and a fifth lens 650 from the object side to the image side. Imaging plane 670 . The electronic photosensitive element 680 is disposed on the imaging surface 670 . The lenses (610-650) of the imaging optical lens group are five. Each of the first lens 610 , the second lens 620 , the third lens 630 , the fourth lens 640 and the fifth lens 650 has an air space between two adjacent lenses on the optical axis.

The first lens 610 has a positive refractive power and is made of plastic material. The object-side surface 611 is convex at the near optical axis, the image-side surface 612 is concave at the near optical axis, and both surfaces are aspherical.

The second lens 620 has a negative refractive power and is made of plastic material. The object-side surface 621 is concave at the near-optical axis, the image-side surface 622 is convex at the near-optical axis, and both surfaces are aspherical.

The third lens 630 has a negative refractive power and is made of plastic material. Its object-side surface 631 is concave at the near-optical axis, its image-side surface 632 is convex at the near-optical axis, and both surfaces are aspherical. The side surface 631 has at least one concave surface off-axis, and like the side surface 632 has at least one concave surface off-axis.

The fourth lens 640 has a negative refractive power and is made of plastic material. Its object-side surface 641 is concave at the near-optical axis, and its image-side surface 642 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 642 has at least one convex surface off-axis.

The fifth lens 650 has a positive refractive power and is made of plastic material. The object-side surface 651 is concave at the near optical axis, the image-side surface 652 is convex at the near optical axis, and both surfaces are aspherical.

The infrared filter element 660 is made of glass, which is disposed between the fifth lens 650 and the imaging surface 670 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 11 and Table 12 below.

In the sixth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

<Seventh Embodiment>

Please refer to FIGS. 13 and 14 , wherein FIG. 13 is a schematic diagram of an imaging device according to a seventh embodiment of the present invention, and FIG. 14 is a graph of spherical aberration, astigmatism and distortion of the seventh embodiment from left to right. As can be seen from FIG. 13 , the imaging device includes an imaging optical lens group (not marked otherwise) and an electronic photosensitive element 780 . The imaging optical lens group sequentially includes an aperture 700, a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, an infrared filter element 760, and a fifth lens 750 from the object side to the image side. Imaging plane 770 . The electronic photosensitive element 780 is disposed on the imaging surface 770 . The lenses (710-750) of the imaging optical lens group are five. Each of the first lens 710 , the second lens 720 , the third lens 730 , the fourth lens 740 and the fifth lens 750 has an air space between two adjacent lenses on the optical axis.

The first lens 710 has a positive refractive power and is made of plastic material. The object-side surface 711 is convex at the near-optical axis, and the image-side surface 712 is convex at the near-optical axis. Both surfaces are aspherical.

The second lens 720 has a negative refractive power and is made of plastic material. The object-side surface 721 is concave at the near optical axis, the image-side surface 722 is concave at the near optical axis, and both surfaces are aspherical.

The third lens 730 has a positive refractive power and is made of plastic material. Its object-side surface 731 is concave at the near-optical axis, its image-side surface 732 is convex at the near-optical axis, and both surfaces are aspherical. The side surface 731 has at least one concave surface off-axis, and like the side surface 732 has at least one concave surface off-axis.

The fourth lens 740 has a negative refractive power and is made of plastic material. Its object-side surface 741 is concave at the near-optical axis, and its image-side surface 742 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 742 has at least one convex surface off-axis.

The fifth lens 750 has a positive refractive power and is made of plastic material. The object-side surface 751 is convex at the near optical axis, the image-side surface 752 is concave at the near optical axis, and both surfaces are aspherical.

The infrared filter element 760 is made of glass, which is disposed between the fifth lens 750 and the imaging surface 770 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 13 and Table 14 below.

In the seventh embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

<Eighth Embodiment>

Please refer to FIGS. 15 and 16 , wherein FIG. 15 is a schematic diagram of an imaging device according to an eighth embodiment of the present invention, and FIG. 16 is a graph of spherical aberration, astigmatism and distortion of the eighth embodiment from left to right. As can be seen from FIG. 15 , the imaging device includes an imaging optical lens group (not numbered otherwise) and an electronic photosensitive element 880 . The imaging optical lens group includes an aperture 800, a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, an infrared filter element 860 and Imaging plane 870. The electronic photosensitive element 880 is disposed on the imaging surface 870 . The lenses (810-850) of the imaging optical lens group are five. Each of the first lens 810 , the second lens 820 , the third lens 830 , the fourth lens 840 and the fifth lens 850 has an air space between two adjacent lenses on the optical axis.

The first lens 810 has a positive refractive power and is made of plastic material. The object-side surface 811 is convex at the near optical axis, the image-side surface 812 is convex at the near optical axis, and both surfaces are aspherical.

The second lens 820 has negative refractive power and is made of plastic material. The object-side surface 821 is concave at the near-optical axis, the image-side surface 822 is concave at the near-optical axis, and both surfaces are aspherical.

The third lens 830 has a negative refractive power and is made of plastic material. Its object-side surface 831 is concave at the near-optical axis, its image-side surface 832 is convex at the near-optical axis, and both surfaces are aspherical. The side surface 831 has at least one concave surface off-axis, and like the side surface 832 has at least one concave surface off-axis.

The fourth lens 840 has a negative refractive power and is made of plastic material. Its object-side surface 841 is concave at the near-optical axis, and its image-side surface 842 is concave at the near-optical axis. Both surfaces are aspherical. The side surface 842 has at least one convex surface off-axis.

The fifth lens 850 has positive refractive power and is made of plastic material. The object-side surface 851 is convex at the near optical axis, the image-side surface 852 is concave at the near optical axis, and both surfaces are aspherical.

The infrared filter element 860 is made of glass, which is disposed between the fifth lens 850 and the imaging surface 870 and does not affect the focal length of the optical imaging lens group.

Please refer to Table 15 and Table 16 below.

In the eighth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated here.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the scope defined by the appended claims.

Claims (27)

1. An imaging optical lens group, characterized in that, from the object side to the image side, it comprises: a first lens with positive refractive power, and its object-side surface is convex at the near optical axis; a second lens with negative refractive power, and its object-side surface is concave at the near optical axis; a third lens, whose object-side surface is convex at the near optical axis, and whose object-side surface and image-side surface are both aspherical; A fourth lens having negative refractive power, its object-side surface is concave at the near-optical axis, its image-side surface is concave at the near-optical axis, its image-side surface is at least one convex off-axis, and its object-side surface is concave at the near-optical axis both the surface and the image-side surface are aspheric; and a fifth lens with positive refractive power, and both the object side surface and the image side surface are aspherical; Wherein, the total number of lenses in the imaging optical lens group is five, and two adjacent lenses in the first lens, the second lens, the third lens, the fourth lens and the fifth lens are on the optical axis have an air space; The radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the dispersion coefficient of the fourth lens is V4, the dispersion coefficient of the fifth lens is V5, and the fourth lens has a dispersion coefficient of V5. The focal length of the second lens is f2, and the focal length of the fourth lens is f4, which satisfies the following conditions: (R3+R4)/(R3-R4)<0.50; 1.8<V4/V5<3.5; and f4/f2<1.0. 2 . The imaging optical lens group according to claim 1 , wherein the distance between the first lens and the second lens on the optical axis is T12, and the second lens and the third lens are on the optical axis. 3 . The separation distance on the lens is T23, the separation distance between the third lens and the fourth lens on the optical axis is T34, and the separation distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following conditions: 1.0<T34/(T12+T23+T45)<4.0. 3. The optical lens assembly for imaging according to claim 1, wherein the dispersion coefficient of the first lens is V1, the dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the third lens is V3. The dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which satisfy the following conditions: 0.45<(V2+V3+V5)/(V1+V4)<0.75. 4. The optical lens group for imaging according to claim 1, wherein the focal length of the optical lens group for imaging is f, and the radius of curvature of the image-side surface of the fifth lens is R10, which satisfies the following conditions: f/|R10|<1.20. 5. The optical lens assembly for imaging according to claim 1, wherein the radius of curvature of the object-side surface of the second lens is R3, and the radius of curvature of the image-side surface of the second lens is R4, which satisfies the following conditions: (R3+R4)/(R3-R4)<0. 6. The optical lens group for imaging according to claim 1, wherein the maximum imaging height of the optical lens group for imaging is 1 mgH, and the focal length of the optical lens group for imaging is f, which satisfies the following conditions: 0.25<ImgH/f<0.55. 7. The imaging optical lens group according to claim 1, wherein the distance from the object side surface of the first lens to an imaging surface on the optical axis is TL, and the focal length of the imaging optical lens group is f, It satisfies the following conditions: 0.75<TL/f<1.10. 8 . The imaging optical lens group according to claim 1 , wherein the distance between the third lens and the fourth lens on the optical axis is T34, and the image-side surface of the fifth lens to an imaging surface is at a distance of T34 . 9 . The distance on the optical axis is BL, which satisfies the following conditions: 1.20<T34/BL<2.5. 9. The imaging optical lens group according to claim 1, wherein the focal length of the imaging optical lens group is f, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the third lens is f3. The focal length of the quad lens is f4, which satisfies the following conditions: -4.0<(f/f2)+(f/f3)+(f/f4)<-2.0. 10 . The imaging optical lens group according to claim 1 , wherein the distance between the first lens and the second lens on the optical axis is T12, and the second lens and the third lens are on the optical axis. 11 . The separation distance on is T23, which satisfies the following conditions: 0<T23/T12<1.75. 11 . The imaging optical lens assembly according to claim 1 , wherein the object-side surface of the fifth lens is convex at the near optical axis. 12 . 12 . The imaging optical lens assembly of claim 1 , wherein the image-side surface of the fifth lens is concave at the near optical axis. 13 . 13 . The imaging optical lens assembly of claim 1 , wherein the image-side surface of the third lens is concave at the near optical axis. 14 . 14. An imaging optical lens group, characterized in that, from the object side to the image side, it comprises: a first lens with positive refractive power, and its object-side surface is convex at the near optical axis; a second lens with negative refractive power, and its object-side surface is concave at the near optical axis; a third lens, whose object-side surface and image-side surface are both aspherical; A fourth lens having negative refractive power, its object-side surface is concave at the near-optical axis, its image-side surface is concave at the near-optical axis, its image-side surface is at least one convex off-axis, and its object-side surface is concave at the near-optical axis both the surface and the image-side surface are aspheric; and a fifth lens with positive refractive power, and both the object side surface and the image side surface are aspherical; Wherein, the total number of lenses in the imaging optical lens group is five, and two adjacent lenses in the first lens, the second lens, the third lens, the fourth lens and the fifth lens are on the optical axis have an air space; The radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which satisfies The following conditions: (R3+R4)/(R3-R4)≤-0.30; and 1.8<V4/V5<3.5. 15. The imaging optical lens group according to claim 14, wherein the focal length of the imaging optical lens group is f, and the radius of curvature of the image-side surface of the fifth lens is R10, which satisfies the following conditions: f/|R10|<1.20. 16. The optical lens assembly for imaging according to claim 14, wherein the distance between the first lens and the second lens on the optical axis is T12, and the second lens and the third lens are on the optical axis The separation distance on the lens is T23, the separation distance between the third lens and the fourth lens on the optical axis is T34, and the separation distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following conditions: 1.0<T34/(T12+T23+T45)<4.0. 17 . The imaging optical lens group according to claim 14 , wherein the distance between the first lens and the second lens on the optical axis is T12, and the second lens and the third lens are on the optical axis. 18 . The separation distance on is T23, which satisfies the following conditions: 0<T23/T12<1.75. 18. The imaging optical lens group according to claim 14, wherein the focal length of the imaging optical lens group is f, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the third lens is f3. The focal length of the quad lens is f4, which satisfies the following conditions: -4.0<(f/f2)+(f/f3)+(f/f4)<-2.0. 19. The optical lens group for imaging according to claim 14, wherein the maximum imaging height of the optical lens group for imaging is 1 mgH, and the focal length of the optical lens group for imaging is f, which satisfies the following conditions: 0.25<ImgH/f<0.55. 20. The imaging optical lens group according to claim 14, wherein the distance from the object side surface of the first lens to an imaging surface on the optical axis is TL, and the focal length of the imaging optical lens group is f, It satisfies the following conditions: 0.75<TL/f<1.10. 21. The optical lens assembly for imaging according to claim 14, wherein the distance between the third lens and the fourth lens on the optical axis is T34, and the image side surface of the fifth lens to an imaging surface is at a distance of T34. The distance on the optical axis is BL, which satisfies the following conditions: 1.20<T34/BL<2.5. 22. An imaging optical lens group, characterized in that, from the object side to the image side, it comprises: a first lens with positive refractive power, its object-side surface is convex at the near-optical axis, and its image-side surface is concave at the near-optical axis; a second lens with negative refractive power, and its object-side surface is concave at the near optical axis; a third lens, whose object-side surface and image-side surface are both aspherical; A fourth lens having negative refractive power, its object-side surface is concave at the near-optical axis, its image-side surface is concave at the near-optical axis, its image-side surface is at least one convex off-axis, and its object-side surface is concave at the near-optical axis both the surface and the image-side surface are aspheric; and a fifth lens with positive refractive power, and both the object side surface and the image side surface are aspherical; Wherein, the total number of lenses in the imaging optical lens group is five, and two adjacent lenses in the first lens, the second lens, the third lens, the fourth lens and the fifth lens are on the optical axis have an air space; Wherein, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the maximum imaging height of the imaging optical lens group is 1 mgH, and the imaging optical lens group has a focal length of f, which satisfies the following conditions: (R3+R4)/(R3-R4)<0.50; and 0.25<ImgH/f<0.55. 23. The imaging optical lens group according to claim 22, wherein the distance from the object side surface of the first lens to an imaging surface on the optical axis is TL, and the focal length of the imaging optical lens group is f, It satisfies the following conditions: 0.75<TL/f<1.10. 24. The optical lens assembly for imaging according to claim 22, wherein the distance between the first lens and the second lens on the optical axis is T12, and the second lens and the third lens are on the optical axis The separation distance on the lens is T23, the separation distance between the third lens and the fourth lens on the optical axis is T34, and the separation distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following conditions: 1.0<T34/(T12+T23+T45)<4.0. 25. The optical lens assembly for imaging according to claim 22, wherein the dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which satisfy the following conditions: 1.8<V4/V5<3.5. 26. The optical lens assembly for imaging according to claim 22, wherein the dispersion coefficient of the first lens is V1, the dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the third lens is V3. The dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, which satisfy the following conditions: 0.45<(V2+V3+V5)/(V1+V4)<0.75. 27. The optical lens assembly for imaging according to claim 22, wherein the distance between the first lens and the second lens on the optical axis is T12, and the second lens and the third lens are on the optical axis The separation distance on is T23, which satisfies the following conditions: 0<T23/T12<1.75.

Images