CN106814435A - Optical lens group for shooting, image capturing device and electronic device - Google Patents

Abstract

The invention discloses an optical lens group for shooting, an image capturing device and an electronic device. The first lens element with negative refractive power has a concave image-side surface. The image side surface of the second lens is a concave surface. The image side surface of the fourth lens is a convex surface. The sixth lens element has a concave object-side surface. The optical lens group for image pickup has six lenses. The invention also discloses an image capturing device with the image pickup optical lens group and an electronic device with the image capturing device.

Description

Optical lens group for imaging, imaging device and electronic device

technical field

The invention relates to an optical lens group for imaging, an image capturing device and an electronic device, in particular to an optical lens group for imaging and an image capturing device suitable for the electronic device.

Background technique

In recent years, with the vigorous development of miniaturized camera lenses, the demand for miniature imaging modules is increasing day by day, and the photosensitive element of general camera lenses is nothing more than a charge coupled device (CCD) or a complementary metal oxide semiconductor element. (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor) two types, and with the advancement of semiconductor technology, the pixel size of the photosensitive element is reduced, and today's electronic products are developing with good functions and thin, light and small appearance. Therefore, Miniaturized camera lenses with good imaging quality have become the mainstream in the current market.

With the gradual popularization of lens types and uses, many electronic products such as home appliances, game consoles, monitors, automobiles, smart phones, wearable devices, and tablet computers are equipped with camera lenses. The camera lens can be used for functions such as image assistance, image recognition, and motion detection. Some electronic devices (such as infrared devices for detecting the position of the human body) must operate in an environment with low light source brightness or low light intensity, so the optical system of the matching camera lens must have sufficient light input. Although the traditional optical system installed in the camera lens can provide a large aperture to maintain sufficient light input, it will greatly reduce the image resolution and affect the image quality. Therefore, how to provide an optical system that can meet the requirements of large aperture and high imaging quality is one of the problems that need to be solved urgently.

Contents of the invention

The object of the present invention is to provide a kind of optical lens group for photographing, image-taking device and electronic device, wherein the first lens of optical lens group for photographing has negative refraction force, can assist the peripheral ray with larger angle of view to be incident on the optical lens for photographing In the group, and the incident peripheral light converges to the imaging surface through the lens closer to the imaging surface. When certain conditions are met, it can ensure the balance of material matching and system quality, especially in the infrared band, it can balance the above two more effectively. In addition, it is helpful to ensure the sufficient amount of light entering the center and the periphery and the balance of relative illuminance when the viewing angle is large. In addition, it also helps to ensure the viewing angle and resolution capability of the optical lens group for imaging under the limited total optical length. Furthermore, the field of view of the optical lens group for imaging can be enlarged.

The invention provides an optical lens group for photographing, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side. The first lens has negative refractive power, and its image-side surface is concave. The image-side surface of the second lens is concave. The image-side surface of the fourth lens is convex. The object-side surface of the sixth lens is concave. There are six lenses in the optical lens group for photographing. The number of lenses with dispersion coefficient less than 40 in the imaging optical lens group is Vn (40), the maximum imaging height of the imaging optical lens group is ImgH, the entrance pupil diameter of the imaging optical lens group is EPD, the first lens object side surface to The distance of an imaging surface on the optical axis is TL, and the focal length of the optical lens group for imaging is f, which satisfies the following conditions:

4≦Vn(40);

0.85<ImgH/EPD<2.20; and

6.0<TL/f.

The present invention further provides an optical lens set for photographing, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side. The first lens has negative refractive power, and its image-side surface is concave. The image-side surface of the second lens is concave. The image-side surface of the fourth lens is convex. The object-side surface of the sixth lens is concave. There are six lenses in the optical lens group for photographing. The number of lenses with dispersion coefficient less than 30 in the imaging optical lens group is Vn(30), the maximum imaging height of the imaging optical lens group is ImgH, the entrance pupil diameter of the imaging optical lens group is EPD, the first lens object side surface to The distance of an imaging surface on the optical axis is TL, and the focal length of the optical lens group for imaging is f, which satisfies the following conditions:

3≦Vn(30);

0.85<ImgH/EPD<2.20; and

7.0<TL/f.

The present invention further provides an optical lens set for imaging, wherein the optical lens set for imaging has six lenses, and the optical lens set for imaging is suitable for the wavelength range of 800 nanometers to 1200 nanometers. The maximum imaging height of the optical lens group for imaging is ImgH, the entrance pupil aperture of the optical lens group for imaging is EPD, and the distance from a lens surface to an imaging surface closest to an object on the optical axis is TL. The focal length of the lens group is f, and the maximum viewing angle of the optical lens group for photography is FOV, which satisfies the following conditions:

0.60<ImgH/EPD<1.80;

7.0<TL/f; and

80 [degrees] < FOV.

The present invention provides an image-capturing device, comprising any of the aforementioned optical lens sets for imaging and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the optical lens set for imaging.

The present invention provides an electronic device, including the aforementioned image capturing device.

When Vn(40) or Vn(30) satisfies the above conditions, the balance between material matching and system quality can be ensured, especially in the infrared band, the above two can be more effectively balanced.

When the ImgH/EPD satisfies the above conditions, it will help to ensure the sufficient amount of light entering the center and the periphery and the balance of relative illuminance when the viewing angle is large.

When TL/f satisfies the above conditions, it is helpful to ensure the viewing angle and resolution capability of the optical lens group for imaging under the limited total optical length.

When the FOV satisfies the above conditions, it is helpful to expand the field of view of the optical lens group for imaging.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

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

Fig. 2 is the spherical aberration, astigmatism and distortion curves of the first embodiment in order from left to right;

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

Fig. 4 is the spherical aberration, astigmatism and distortion curves of the second embodiment in sequence from left to right;

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

Fig. 6 is the spherical aberration, astigmatism and distortion curves of the third embodiment in order 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 the spherical aberration, astigmatism and distortion curves of the fourth embodiment in order from left to right;

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

Fig. 10 is the spherical aberration, astigmatism and distortion curves of the fifth embodiment in order from left to right;

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

Fig. 12 is the spherical aberration, astigmatism and distortion curves of the sixth embodiment in order from left to right;

FIG. 13 shows a schematic diagram of an electronic device according to the present invention;

FIG. 14 shows a schematic diagram of another electronic device according to the present invention;

FIG. 15 is a schematic diagram of yet another electronic device according to the present invention.

Among them, reference signs

Image taking device: 10

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

First lens: 110, 210, 310, 410, 510, 610

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Sixth lens: 160, 260, 360, 460, 560, 660

Object side surface: 161, 261, 361, 461, 561, 661

Image side surface: 162, 262, 362, 462, 562, 662

Filter elements: 170, 270, 370, 470, 570, 670

Imaging surface: 180, 280, 380, 480, 580, 680

Electronic photosensitive element: 190, 290, 390, 490, 590, 690

BL: The distance from the image-side surface of the sixth lens (the lens surface closest to the imaging surface) to the imaging surface on the optical axis

EPD: Entrance pupil diameter of the optical lens group for photography

Fno: the aperture value of the optical lens group for photography

f: the focal length of the optical lens group for photography

f1: focal length of the first lens

f4: focal length of the fourth lens

ff: focal length of all lenses set between the subject and the aperture

fr: the focal length of all lenses placed between the aperture and the imaging plane

HFOV: half of the maximum angle of view in the optical lens group for photography

FOV: the maximum viewing angle of the optical lens group for photography

ImgH: The maximum imaging height of the optical lens group for photography

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

SDavg: The average value of the maximum effective radii of all lens surfaces in the third lens, fourth lens, fifth lens and sixth lens

SDstop: Aperture radius of the iris

TL: The distance from the object-side surface of the first lens (the lens surface closest to the subject) to the imaging plane on the optical axis

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

Vn(30): The number of lenses with a dispersion coefficient less than 30 in the optical lens group for imaging

Vn(40): The number of lenses with a dispersion coefficient less than 40 in the optical lens group for imaging

ΣAT: the sum of the distances between two adjacent lenses on the optical axis in the optical lens group for photography

detailed description

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

The optical lens group for photographing sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side. Wherein, there are six lenses in the optical lens group for imaging.

The first lens may have negative refractive power, and its image-side surface may be concave. In this way, peripheral rays with a larger viewing angle can be assisted to enter the imaging optical lens group, and the incident peripheral rays can be converged on the imaging surface through the lens closer to the imaging surface.

The image-side surface of the second lens may be concave. This helps to correct chromatic aberration.

The image-side surface of the fourth lens may be convex. Thereby, the Petzval's sum of the imaging optical lens group can be effectively corrected to make the imaging surface flatter, and the correction of astigmatism can be strengthened.

The fifth lens may have positive refractive power. Thereby, the total optical length of the imaging optical lens group can be shortened.

The object-side surface of the sixth lens may be concave. Thereby, the incident angle of the light in the off-axis field of view 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. In addition, the image-side surface of the sixth lens can be convex, so that the angle of the chief ray can be gradually reduced.

The number of lenses whose dispersion coefficient is less than 40 in the imaging optical lens group is Vn(40), and the number of lenses whose dispersion coefficient is less than 30 in the imaging optical lens group is Vn(30), which meets the following conditions: 4≦Vn(40) or 3≦Vn(30). In this way, the balance between material matching and system quality can be ensured, especially in the infrared band, the above two can be more effectively balanced. Preferably, the infrared wavelength band may be in the wavelength range of 800nm˜1200nm.

The maximum imaging height of the optical lens group for imaging is ImgH (half of the effective sensing area diagonal total length of the electronic photosensitive element), and the entrance pupil aperture of the optical lens group for imaging is EPD, which meets the following conditions: 0.85<ImgH/ EPD<2.20. In this way, it is helpful to ensure the sufficient amount of light entering the center and the periphery and the balance of relative illuminance when the viewing angle is large. Preferably, it can further satisfy the following condition: 0.60<ImgH/EPD<1.80. More preferably, it can further satisfy the following condition: 1.0<ImgH/EPD<2.0.

The object-side surface of the first lens is the lens surface closest to the object among all the lens surfaces of the first lens to the sixth lens. The distance on the optical axis from the object-side surface of the first lens to an imaging plane is TL, and the focal length of the imaging optical lens group is f, which satisfy the following conditions: 6.0<TL/f. Thereby, it is helpful to ensure the viewing angle and resolution capability of the optical lens group for photography under the limited total optical length. Preferably, it can further satisfy the following condition: 7.0<TL/f. More preferably, it can further satisfy the following condition: 7.0<TL/f<12.0.

The refractive power of the fifth lens can be the strongest in the optical lens group for photographing. That is to say, the absolute value of the refractive power of the fifth lens is greater than the absolute value of the refractive power of the first lens, the second lens, the third lens, the fourth lens and the sixth lens. In this way, the fifth lens helps to ensure that the image-side end of the optical lens group for imaging has sufficient refractive power to converge incident light. In addition, when the sixth lens has a negative refractive power, the fifth lens contributes to shortening the back focal length of the imaging optical lens group to maintain miniaturization. The refractive power of each lens is the value obtained by dividing the focal length of the imaging optical lens group by the focal length of each lens, and the strongest refractive power means that the value has the largest absolute value. Wherein, among the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, at least three lenses may be negative refractive power lenses.

The maximum viewing angle of the optical lens group for imaging is FOV, which satisfies the following condition: 80[degrees]<FOV. Thereby, it is helpful to expand the field of view of the optical lens group for imaging. Preferably, it may further satisfy the following condition: 95[degrees]<FOV<180[degrees].

The focal length of the first lens is f1, and the focal length of the fourth lens is f4, which may satisfy the following condition: |f1/f4|<0.80. In this way, excessive aberration correction caused by too strong distribution of refractive power at the center of the imaging optical lens group can be avoided.

The focal length of the imaging optical lens group is f, and the entrance pupil diameter of the imaging optical lens group is EPD, which can satisfy the following condition: f/EPD<2.0. Thereby, the amount of light entering the optical lens group for imaging can be increased, which is beneficial to improving the photosensitive ability of image taking under low light source environment. Preferably, it can further satisfy the following condition: f/EPD<1.75.

The optical lens set for photographing disclosed by the present invention may include an aperture. The focal length of all lenses arranged between an object and the aperture is ff, and the focal length of all lenses arranged between the aperture and the imaging plane is fr, which can satisfy the following conditions: 0<ff/fr<1.25. In this way, the refractive power distribution of the lens group before the aperture and the distribution of the lens group refractive power after the aperture can be properly balanced, so that the optical lens group for imaging has the characteristics of large aperture and miniaturization. When only a single lens is set between the subject and the aperture, ff is equal to the focal length of this lens; when multiple lenses are set between the subject and the aperture, ff is equivalent to the combination of these lenses focal length. Similarly, when only a single lens is set between the aperture and the imaging plane, fr is equal to the focal length of the lens; when multiple lenses are set between the aperture and the imaging plane, fr is equal to the focal length of these lenses Composite focal length.

The average value of the maximum effective radius of all lens surfaces in the third lens, the fourth lens, the fifth lens and the sixth lens is SDavg, and the aperture radius of the aperture is SDstop, which can satisfy the following condition: 0.5<SDavg/SDstop<1.25. In this way, it is possible to ensure that the surrounding light is sufficient. The aforementioned average value of the maximum effective radii of all lens surfaces refers to the arithmetic mean of these maximum effective radii.

The radius of curvature of the image-side surface of the second lens is R4, and the focal length of the imaging optical lens group is f, which can satisfy the following conditions: 0.50<R4/f<4.5. Thereby, it is beneficial to correct the aberration generated by the first lens.

The distance between the first lens and the second lens on the optical axis is T12, and the sum of the distances between two adjacent lenses on the optical axis in the optical lens group for imaging is ΣAT, which can meet the following conditions: 0.45<T12/ΣAT <0.85. Thereby, the tightness between the lenses close to the image-side end of the imaging optical lens group can be ensured, which is beneficial to improve the difficulty of assembly.

The image-side surface of the sixth lens is the lens surface closest to the subject among all the lens surfaces of the first lens to the sixth lens. The distance on the optical axis from the image-side surface of the sixth lens to the imaging surface is BL, and the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, which can satisfy the following conditions: 0<BL/TL<0.20. Thereby, it is helpful to reduce the back focal length of the optical lens group for imaging and maintain its miniaturization.

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

In the optical lens set 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 is made of plastic, the production cost can be effectively reduced. In addition, an aspheric surface (ASP) can be set on the lens surface. The aspheric 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 lenses required, so it can be effectively Reduce the overall optical length. More than one glass lens can be matched in the optical lens set for photographing to reduce the influence of the environment on the optical lens set for photographing. Alternatively, more than one plastic aspheric lens can be used in the optical lens set for imaging to make good aberration correction.

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 lens surface is concave and the position of the concave surface is not defined, It means that the concave surface can be located at the near optical axis of the lens surface. If the refractive power or focal length of the lens does not define its area position, it means that the refractive power or focal length of the lens may be the refractive power or focal length of the lens at the near optical axis.

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

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

The present invention further provides an image-capturing device, which includes the aforementioned optical lens set for imaging and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the optical lens set for imaging. Preferably, the imaging device may further include a lens barrel, a holder member or a combination thereof.

Please refer to FIGS. 13, 14 and 15. The image capturing device 10 can be applied in many ways to a reverse developing device (as shown in FIG. 13 ), a driving recorder (as shown in FIG. 14 ) and a safety monitoring device (as shown in FIG. 15 ). Wait. Preferably, the electronic device may further include a control unit, a display unit, a storage unit, a temporary storage unit (RAM) or a combination thereof.

The optical lens set for photography 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 in various aspects to electronic devices such as three-dimensional (3D) image capture, mobile devices, smart TVs, network monitoring equipment, driving recorders, reversing developing devices, somatosensory game machines, and wearable devices. The optical lens set for imaging of the present invention can also be applied to electronic devices that need to be equipped with infrared lenses, such as electronic devices such as dynamic somatosensory detection and night surveillance cameras. Furthermore, the imaging optical lens set of the present invention can be used in the wavelength range of 800 nanometers (nm) to 1200 nm, but this wavelength range is not intended to limit the present invention. The electronic device disclosed above 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.

<First embodiment>

Please refer to FIG. 1 and FIG. 2 , wherein FIG. 1 shows a schematic diagram of an imaging device according to a first embodiment of the present invention, and FIG. 2 is a diagram of spherical aberration, astigmatism and distortion curves of the first embodiment from left to right. As can be seen from FIG. 1 , the image capturing device includes an optical lens set for imaging (not another number) and an electronic photosensitive element 190 . The optical lens group for imaging includes the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the aperture 100, the fifth lens 150, the sixth lens 160, and the filter element from the object side to the image side. (Filter) 170 and imaging surface 180 . Wherein, the electronic photosensitive element 190 is disposed on the imaging surface 180 . There are six lenses (110-160) in the optical lens group for imaging.

The first lens 110 has negative refractive power and is made of glass. The object-side surface 111 is convex, the image-side surface 112 is concave, and both surfaces are spherical.

The second lens 120 has negative refractive power and is made of glass. The object-side surface 121 is convex, the image-side surface 122 is concave, and both surfaces are spherical.

The third lens 130 has a positive refractive power and is made of glass. The object-side surface 131 is convex, the image-side surface 132 is convex, and both surfaces are spherical.

The fourth lens 140 has a positive refractive power and is made of glass. The object-side surface 141 is concave, the image-side surface 142 is convex, and both surfaces are spherical.

The fifth lens 150 has a positive refractive power and is made of glass. The object-side surface 151 is convex, the image-side surface 152 is convex, and both surfaces are spherical.

The sixth lens 160 has negative refractive power and is made of glass. The object-side surface 161 is concave, the image-side surface 162 is convex, and both surfaces are spherical.

The material of the filter element 170 is glass, which is disposed between the sixth lens 160 and the imaging surface 180 and does not affect the focal length of the imaging optical lens group.

Among the first lens 110 , the second lens 120 , the third lens 130 , the fourth lens 140 , the fifth lens 150 and the sixth lens 160 , the fifth lens 150 has the strongest refractive power. As shown in Table 1 below, the absolute value 4.09 of the focal length of the fifth lens 150 is the minimum focal length.

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 half of the maximum viewing angle in the imaging optical lens group is HFOV , and its values are as follows: f=1.80 millimeters (mm), Fno=1.50, HFOV=65.0 degrees (deg.).

The focal length of the imaging optical lens set is f, and the entrance pupil diameter of the imaging optical lens set is EPD, which satisfies the following condition: f/EPD=1.50.

The maximum viewing angle of the optical lens group for imaging is FOV, which satisfies the following condition: FOV=130.0 degrees.

The distance on the optical axis from the object-side surface 111 of the first lens to the imaging surface 180 is TL, and the focal length of the imaging optical lens group is f, which satisfies the following condition: TL/f=10.28. In this embodiment, the object-side surface 111 of the first lens is the lens surface closest to the object (not shown) in the imaging optical lens group.

The distance on the optical axis from the sixth lens image side surface 162 to the imaging plane 180 is BL, and the distance on the optical axis from the first lens object side surface 111 to the imaging plane 180 is TL, which satisfies the following conditions: BL/TL=0.11 . In this embodiment, the image-side surface 162 of the sixth lens is the lens surface closest to the imaging surface 180 in the imaging optical lens group.

The distance between the first lens 110 and the second lens 120 on the optical axis is T12, and the sum of the distances between each two adjacent lenses on the optical axis in the optical lens group for imaging is ΣAT, which satisfies the following conditions: T12/ΣAT= 0.68. In this embodiment, ΣAT is the distance between the first lens 110 and the second lens 120 on the optical axis, the distance between the second lens 120 and the third lens 130 on the optical axis, the distance between the third lens 130 and the fourth lens The sum of the distance between the lenses 140 on the optical axis, the distance between the fourth lens 140 and the fifth lens 150 on the optical axis, and the distance between the fifth lens 150 and the sixth lens 160 on the optical axis.

The average value of the maximum effective radius of all lens surfaces in the 3rd lens 130, the 4th lens 140, the 5th lens 150 and the 6th lens 160 is SDavg, and the aperture radius of aperture 100 is SDstop, and it satisfies following condition: SDavg/SDstop= 1.17. In this embodiment, the lens surfaces 131 , 141 , 151 , 161 , 132 , 142 , 152 and 162 all have a maximum effective radius. The value obtained by dividing the sum of these maximum effective radii by the number of lens surfaces (8 surfaces in total) is SDavg.

The maximum imaging height of the imaging optical lens set is ImgH, and the entrance pupil diameter of the imaging optical lens set is EPD, which satisfies the following condition: ImgH/EPD=1.67.

The radius of curvature of the image-side surface 122 of the second lens is R4, and the focal length of the imaging optical lens group is f, which satisfies the following condition: R4/f=1.54.

The focal length of the first lens 110 is f1, and the focal length of the fourth lens 140 is f4, which satisfy the following condition: |f1/f4|=0.31.

The focal length of all lenses arranged between the subject and the aperture 100 is ff, and the focal length of all lenses arranged between the aperture 100 and the imaging surface 180 is fr, which satisfy the following condition: ff/fr=1.06. In this embodiment, ff is the combined focal length of the first lens 110 , the second lens 120 , the third lens 130 and the fourth lens 140 , and fr is the combined focal length of the fifth lens 150 and the sixth lens 160 .

The number of lenses whose dispersion coefficient is less than 40 in the imaging optical lens group is Vn(40), which satisfies the following condition: Vn(40)=6.

The number of lenses whose dispersion coefficient is less than 30 in the imaging optical lens group is Vn(30), which satisfies the following condition: Vn(30)=5.

Please refer to Table 1 below.

Table 1 shows the detailed structural data of the first embodiment in FIG. 1 , where the units of the radius of curvature, thickness and focal length are millimeters (mm), and surfaces 0 to 16 represent surfaces from the object side to the image side in sequence. In addition, the tables of the following embodiments are the schematic diagrams and aberration curve diagrams corresponding to the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 of the first embodiment, and will not be repeated here.

<Second Embodiment>

Please refer to FIG. 3 and FIG. 4 , wherein FIG. 3 shows a schematic diagram of an imaging device according to a second embodiment of the present invention, and FIG. 4 is a diagram of spherical aberration, astigmatism and distortion curves of the second embodiment from left to right. As can be seen from FIG. 3 , the image capturing device includes an optical lens set for imaging (not otherwise labeled) and an electronic photosensitive element 290 . The optical lens group for imaging includes the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, the aperture 200, the fifth lens 250, the sixth lens 260, and the filter element from the object side to the image side. 270 and imaging surface 280 . Wherein, the electronic photosensitive element 290 is disposed on the imaging surface 280 . There are six lenses (210-260) in the optical lens group for imaging.

The first lens 210 has negative refractive power and is made of glass. The object-side surface 211 is convex, the image-side surface 212 is concave, and both surfaces are spherical.

The second lens 220 has negative refractive power and is made of glass. The object-side surface 221 is convex, the image-side surface 222 is concave, and both surfaces are spherical.

The third lens 230 has a positive refractive power and is made of glass. The object-side surface 231 is convex, the image-side surface 232 is convex, and both surfaces are spherical.

The fourth lens 240 has a positive refractive power and is made of glass. The object-side surface 241 is concave, the image-side surface 242 is convex, and both surfaces are spherical.

The fifth lens 250 has positive refractive power and is made of glass. The object-side surface 251 is convex, the image-side surface 252 is convex, and both surfaces are spherical.

The sixth lens 260 has negative refractive power and is made of glass. The object-side surface 261 is concave, the image-side surface 262 is convex, and both surfaces are spherical.

The material of the filter element 270 is glass, which is disposed between the sixth lens 260 and the imaging surface 280 and does not affect the focal length of the imaging optical lens group.

Please refer to Table 2 below.

In the second embodiment, the definitions in the table below are the same as those in the first embodiment, and will not be repeated here.

<Third embodiment>

Please refer to FIG. 5 and FIG. 6 , wherein FIG. 5 shows a schematic diagram of an imaging device according to a third embodiment of the present invention, and FIG. 6 is a diagram of spherical aberration, astigmatism and distortion curves of the third embodiment in order from left to right. As can be seen from FIG. 5 , the image capturing device includes an optical lens group for imaging (not another number) and an electronic photosensitive element 390 . The optical lens group for imaging includes the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the diaphragm 300, the fifth lens 350, the sixth lens 360, and the filter element in sequence from the object side to the image side 370 and imaging surface 380 . Wherein, the electronic photosensitive element 390 is disposed on the imaging surface 380 . There are six lenses (310-360) in the optical lens group for imaging.

The first lens 310 has negative refractive power and is made of glass. The object-side surface 311 is convex, the image-side surface 312 is concave, and both surfaces are spherical.

The second lens 320 has negative refractive power and is made of glass. The object-side surface 321 is convex, the image-side surface 322 is concave, and both surfaces are spherical.

The third lens 330 has a positive refractive power and is made of glass. The object-side surface 331 is convex, the image-side surface 332 is convex, and both surfaces are spherical.

The fourth lens 340 has positive refractive power and is made of glass. The object-side surface 341 is concave, the image-side surface 342 is convex, and both surfaces are spherical.

The fifth lens 350 has positive refractive power and is made of glass. The object-side surface 351 is convex, the image-side surface 352 is convex, and both surfaces are spherical.

The sixth lens 360 has negative refractive power and is made of glass. The object-side surface 361 is concave, the image-side surface 362 is convex, and both surfaces are spherical. The image-side surface 352 of the fifth lens is bonded to the object-side surface 361 of the sixth lens.

The material of the filter element 370 is glass, which is disposed between the sixth lens 360 and the imaging surface 380 and does not affect the focal length of the optical lens group for imaging.

Among the first lens 310 , the second lens 320 , the third lens 330 , the fourth lens 340 , the fifth lens 350 and the sixth lens 360 , the fifth lens 350 has the strongest refractive power. As shown in Table 3 below, the absolute value 4.06 of the focal length of the fifth lens 350 is the minimum focal length.

Please refer to Table 3 below.

In the third embodiment, the definitions in the table below are the same as those in the first embodiment, and will not be repeated here.

<Fourth Embodiment>

Please refer to FIG. 7 and FIG. 8 , wherein FIG. 7 shows a schematic diagram of an imaging device according to a fourth embodiment of the present invention, and FIG. 8 is a diagram of spherical aberration, astigmatism and distortion curves of the fourth embodiment from left to right. As can be seen from FIG. 7 , the image capturing device includes an optical lens group for imaging (not another number) and an electronic photosensitive element 490 . The optical lens group for imaging includes the first lens 410, the second lens 420, the third lens 430, the fourth lens 440, the aperture 400, the fifth lens 450, the sixth lens 460, and the filter element from the object side to the image side. 470 and imaging surface 480 . Wherein, the electronic photosensitive element 490 is disposed on the imaging surface 480 . There are six lenses (410-460) in the optical lens group for imaging.

The first lens 410 has negative refractive power and is made of glass. The object-side surface 411 is convex, the image-side surface 412 is concave, and both surfaces are spherical.

The second lens 420 has negative refractive power and is made of glass. The object-side surface 421 is concave, the image-side surface 422 is concave, and both surfaces are spherical.

The third lens 430 has negative refractive power and is made of plastic material. The object-side surface 431 is convex, the image-side surface 432 is concave, and both surfaces are aspherical.

The fourth lens 440 has a positive refractive power and is made of glass. The object-side surface 441 is convex, the image-side surface 442 is convex, and both surfaces are spherical.

The fifth lens 450 has a positive refractive power and is made of glass. The object-side surface 451 is convex, the image-side surface 452 is convex, and both surfaces are spherical.

The sixth lens 460 has negative refractive power and is made of glass. The object-side surface 461 is concave, the image-side surface 462 is convex, and both surfaces are spherical.

The material of the filter element 470 is glass, which is disposed between the sixth lens 460 and the imaging surface 480 and does not affect the focal length of the optical lens group for imaging.

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

;in:

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

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 aspherical coefficient.

Please refer to Table 4 and Table 5 below.

Table 5 shows the aspheric surface data in the fourth embodiment, where k is the cone coefficient in the aspheric curve equation, and A4 to A16 represent the 4th to 16th order aspheric coefficients of each surface. In addition, the definitions described in the table below are the same as those in the first embodiment, and will not be repeated here.

<Fifth Embodiment>

Please refer to FIG. 9 and FIG. 10 , wherein FIG. 9 shows a schematic diagram of an imaging device according to a fifth embodiment of the present invention, and FIG. 10 is a diagram of spherical aberration, astigmatism, and distortion curves of the fifth embodiment in sequence from left to right. As can be seen from FIG. 9 , the image capturing device includes an optical lens group for imaging (not another number) and an electronic photosensitive element 590 . The optical lens group for imaging includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a diaphragm 500, a fifth lens 550, a sixth lens 560, and a filter element from the object side to the image side. 570 and imaging surface 580 . Wherein, the electronic photosensitive element 590 is disposed on the imaging surface 580 . There are six lenses (510-560) in the optical lens group for imaging.

The first lens 510 has negative refractive power and is made of glass. The object-side surface 511 is convex, the image-side surface 512 is concave, and both surfaces are spherical.

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

The third lens 530 has a positive refractive power and is made of plastic material. The object-side surface 531 is convex, the image-side surface 532 is convex, and both surfaces are aspherical.

The fourth lens 540 has positive refractive power and is made of glass. The object-side surface 541 is concave, the image-side surface 542 is convex, and both surfaces are spherical.

The fifth lens 550 has positive refractive power and is made of glass. The object-side surface 551 is convex, the image-side surface 552 is convex, and both surfaces are spherical.

The sixth lens 560 has negative refractive power and is made of glass. The object-side surface 561 is concave, the image-side surface 562 is convex, and both surfaces are spherical.

The material of the filter element 570 is glass, which is disposed between the sixth lens 560 and the imaging surface 580 and does not affect the focal length of the optical lens group for imaging.

Among the first lens 510 , the second lens 520 , the third lens 530 , the fourth lens 540 , the fifth lens 550 and the sixth lens 560 , the fifth lens 550 has the strongest refractive power. As shown in Table 6 below, the absolute value of 3.72 of the focal length of the fifth lens 550 is the minimum focal length.

Please refer to Table 6 and Table 7 below.

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

<Sixth Embodiment>

Please refer to FIG. 11 and FIG. 12 , wherein FIG. 11 shows a schematic diagram of an imaging device according to a sixth embodiment of the present invention, and FIG. 12 is a diagram of spherical aberration, astigmatism and distortion curves of the sixth embodiment in order from left to right. As can be seen from FIG. 11 , the image capturing device includes an optical lens group for imaging (not another number) and an electronic photosensitive element 690 . The optical lens group for imaging includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, an aperture 600, a fifth lens 650, a sixth lens 660, and a filter element from the object side to the image side. 670 and imaging surface 680 . Wherein, the electronic photosensitive element 690 is disposed on the imaging surface 680 . There are six lenses (610-660) in the optical lens group for imaging.

The first lens 610 has negative refractive power and is made of glass. The object-side surface 611 is convex, the image-side surface 612 is concave, and both surfaces are spherical.

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

The third lens 630 has positive refractive power and is made of plastic material. The object-side surface 631 is convex, the image-side surface 632 is concave, and both surfaces are aspherical.

The fourth lens 640 has negative refractive power and is made of plastic material. The object-side surface 641 is concave, the image-side surface 642 is convex, and both surfaces are aspherical.

The fifth lens 650 has positive refractive power and is made of glass. The object-side surface 651 is convex, the image-side surface 652 is convex, and both surfaces are spherical.

The sixth lens 660 has negative refractive power and is made of plastic material. The object-side surface 661 is concave, the image-side surface 662 is convex, and both surfaces are aspherical.

The material of the filter element 670 is glass, which is disposed between the sixth lens 660 and the imaging surface 680 and does not affect the focal length of the imaging optical lens group.

Among the first lens 610 , the second lens 620 , the third lens 630 , the fourth lens 640 , the fifth lens 650 and the sixth lens 660 , the fifth lens 650 has the strongest refractive power. As shown in Table 8 below, the absolute value 2.69 of the focal length of the fifth lens 650 is the minimum focal length.

Please refer to Table 8 and Table 9 below.

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

The above-mentioned image capturing device can be installed in an electronic device. The present invention uses an optical lens group for imaging with six lenses, wherein the first lens has a negative refracting force, which can assist peripheral light rays with a larger viewing angle to enter the optical lens group for imaging, and the incident peripheral light passes through the optical lens group closer to the imaging surface. The lenses converge on the imaging plane. When certain conditions are met, it can ensure the balance of material matching and system quality, especially in the infrared band, it can balance the above two more effectively. In addition, it is helpful to ensure the sufficient amount of light entering the center and the periphery and the balance of relative illuminance when the viewing angle is large. In addition, it also helps to ensure the viewing angle and resolution capability of the optical lens group for imaging under the limited total optical length. Furthermore, the field of view of the optical lens group for imaging can be enlarged. To sum up, the present invention provides an optical lens set for imaging that can meet the requirements of large aperture and high imaging quality at the same time.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any skilled person 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 should be based on the scope defined by the appended claims.

Claims (30)

1. An optical lens group for photographing, is characterized in that, comprises sequentially from object side to image side: A first lens with negative refractive power, and its image-side surface is concave; A second lens whose image-side surface is concave; a third lens; A fourth lens, whose image-side surface is convex; a fifth lens; and A sixth lens, the object side surface of which is concave; Wherein, the lens of this imaging optical lens group is six pieces, the number of lenses with dispersion coefficient less than 40 in this imaging optical lens group is Vn (40), the maximum imaging height of this imaging optical lens group is ImgH, the imaging The entrance pupil aperture of the optical lens group is EPD, 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 optical lens group for photography is f, which satisfies the following conditions: 4≦Vn(40); 0.85<ImgH/EPD<2.20; and 6.0<TL/f. 2. The optical lens group for imaging according to claim 1, wherein the focal length of the first lens is f1, the focal length of the fourth lens is f4, and it satisfies the following conditions: |f1/f4|<0.80. 3. camera optical lens group according to claim 1, is characterized in that, the focal length of this camera optical lens group is f, and the entrance pupil aperture of this camera optical lens group is EPD, and it satisfies the following conditions: f/EPD<2.0. 4. imaging optical lens group according to claim 3, is characterized in that, the focal length of this imaging optical lens group is f, and the entrance pupil aperture of this imaging optical lens group is EPD, and it satisfies the following conditions: f/EPD<1.75. 5. The optical lens group for imaging according to claim 1, wherein the distance on the optical axis from the object-side surface of the first lens to the imaging surface is TL, and the focal length of the optical lens group for imaging is f, It satisfies the following conditions: 7.0<TL/f<12.0. 6 . The imaging optical lens set according to claim 1 , wherein the fifth lens has positive refractive power, and the fifth lens has the strongest refractive power in the imaging optical lens set. 7. The optical lens group for imaging according to claim 1, further comprising an aperture, wherein the focal lengths of all lenses arranged between an object and the aperture are ff, and are arranged between the aperture and the imaging The focal length of all lenses between the planes is fr, which satisfies the following conditions: 0<ff/fr<1.25. 8. The optical lens group for imaging according to claim 1, wherein the radius of curvature of the second lens image side surface is R4, and the focal length of the optical lens group for imaging is f, which satisfies the following conditions: 0.50<R4/f<4.5. 9. The optical lens set for imaging according to claim 1, further comprising an aperture, wherein the maximum of all lens surfaces of the third lens, the fourth lens, the fifth lens and the sixth lens is The average value of the effective radius is SDavg, and the aperture radius of the aperture is SDstop, which meets the following conditions: 0.5<SDavg/SDstop<1.25. 10. The optical lens group for imaging according to claim 1, wherein the maximum viewing angle of the optical lens group for imaging is FOV, and it satisfies the following conditions: 95 degrees<FOV<180 degrees. 11. camera optical lens group according to claim 1, is characterized in that, the maximum imaging height of this camera optical lens group is 1mgH, and the entrance pupil aperture of this camera optical lens group is EPD, and it satisfies the following conditions: 1.0<ImgH/EPD<2.0. 12 . The optical lens set for imaging according to claim 1 , wherein the optical lens set for imaging is suitable for a light wavelength range of 800 nanometers to 1200 nanometers. 13 . 13. An imaging device, characterized in that it comprises: The optical lens group for imaging according to claim 1; and An electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the imaging optical lens group. 14. An electronic device, characterized in that it comprises: The imaging device as claimed in claim 13. 15. An optical lens group for photographing, characterized in that it comprises sequentially from the object side to the image side: A first lens with negative refractive power, and its image-side surface is concave; A second lens whose image-side surface is concave; a third lens; A fourth lens whose image side surface is convex; a fifth lens; and A sixth lens, the object side surface of which is concave; Wherein, the lens of this imaging optical lens group is six pieces, the number of lenses with dispersion coefficient less than 30 in this imaging optical lens group is Vn(30), the maximum imaging height of this imaging optical lens group is ImgH, the imaging The entrance pupil aperture of the optical lens group is EPD, 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 optical lens group for photography is f, which satisfies the following conditions: 3≦Vn(30); 0.85<ImgH/EPD<2.20; and 7.0<TL/f. 16. The optical lens group for imaging according to claim 15, further comprising an aperture, wherein the maximum of all lens surfaces of the third lens, the fourth lens, the fifth lens and the sixth lens is The average value of the effective radius is SDavg, and the aperture radius of the aperture is SDstop, which meets the following conditions: 0.5<SDavg/SDstop<1.25. 17. The optical lens set for imaging according to claim 15, further comprising an aperture, wherein the focal lengths of all lenses arranged between an object and the aperture are ff, and are arranged between the aperture and the imaging The focal length of all lenses between the planes is fr, which satisfies the following conditions: 0<ff/fr<1.25. 18. The optical lens group for imaging according to claim 15, wherein the focal length of the optical lens group for imaging is f, and the entrance pupil aperture of the optical lens group for imaging is EPD, which satisfies the following conditions: f/EPD<1.75. 19. The optical lens group for imaging according to claim 15, wherein the distance between the first lens and the second lens on the optical axis is T12, and each two adjacent lenses in the optical lens group for imaging The sum of the separation distances on the optical axis is ΣAT, which satisfies the following conditions: 0.45<T12/ΣAT<0.85. 20 . The optical lens set for imaging according to claim 15 , wherein the optical lens set for imaging is suitable for a light wavelength range of 800 nanometers to 1200 nanometers. 21 . 21. An imaging device, characterized in that it comprises: The optical lens group for imaging according to claim 15; and An electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the imaging optical lens group. 22. An electronic device, characterized in that it comprises: The imaging device as claimed in claim 21. 23. An optical lens group for imaging, characterized in that the lens of the optical lens group for imaging is six pieces, and the optical lens group for imaging is suitable for the wavelength range of light wavelength 800 nanometers to 1200 nanometers; the optical lens group for imaging The maximum imaging height of the lens group is ImgH, and the entrance pupil aperture of the optical lens group for photography is EPD, and the distance on the optical axis from a lens surface to an imaging surface closest to an object is TL, and the optical lens group for photography is TL. The focal length of the group is f, and the maximum viewing angle of the optical lens group for photography is FOV, which satisfies the following conditions: 0.60<ImgH/EPD<1.80; 7.0<TL/f; and 80 degrees < FOV. 24. The optical lens set for imaging according to claim 23, wherein at least three of the lenses in the optical lens set for imaging have negative refractive power. 25. The optical lens set for imaging according to claim 23, further comprising an aperture, wherein the focal lengths of all lenses arranged between the subject and the aperture are ff, and are arranged between the aperture and the imaging The focal length of all lenses between the planes is fr, which satisfies the following conditions: 0<ff/fr<1.25. 26. The optical lens group for imaging according to claim 23, characterized in that, the number of lenses with dispersion coefficient less than 30 in the optical lens group for imaging is Vn (30), which satisfies the following conditions: 3≦Vn(30). 27. The optical lens set for imaging according to claim 23, wherein the distance from the surface of a lens closest to the imaging plane to the imaging plane on the optical axis is BL, and the lens closest to the subject The distance from the surface to the imaging plane on the optical axis is TL, which satisfies the following conditions: 0<BL/TL<0.20. 28. The optical lens group for imaging according to claim 23, wherein the focal length of the optical lens group for imaging is f, and the entrance pupil aperture of the optical lens group for imaging is EPD, which satisfies the following conditions: f/EPD<1.75. 29. An imaging device, characterized in that it comprises: The optical lens group for imaging according to claim 23; and An electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the imaging optical lens group. 30. An electronic device, characterized in that it comprises: The imaging device as claimed in claim 29.