CN213149355U

CN213149355U - Optical imaging system, image capturing module and electronic device

Info

Publication number: CN213149355U
Application number: CN202022356802.XU
Authority: CN
Inventors: 乐宇明; 蔡雄宇; 兰宾利; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-05-07
Anticipated expiration: 2030-10-21

Abstract

The utility model discloses an optical imaging system, get for instance module and electron device. The optical imaging system comprises the following components in sequence from an object side to an image side: a first lens having a negative bending force; a second lens having a negative bending force; a third lens having a positive refracting power; a fourth lens having a positive refracting power; a fifth lens having a negative refracting power; a sixth lens having a positive refracting power; a seventh lens having a positive refracting power; the optical imaging system satisfies the following conditional expression: -15.7< f2/f < -5.5; wherein f2 is the focal length of the second lens, and f is the effective focal length of the optical imaging system. The optical imaging system not only increases the field angle range, enlarges the imaging range of the object space depth, can capture the detail information out of a long distance, but also can capture the shooting picture in a large angle range.

Description

Optical imaging system, image capturing module and electronic device

Technical Field

The utility model relates to an optical imaging technical field, concretely relates to optical imaging system, get for instance module and electron device.

Background

With the development of the vehicle-mounted industry, the technical requirements of vehicle-mounted cameras such as forward-looking camera shooting, automatic cruise, automobile data recorder and reverse image are higher and higher. The front-view camera is a vehicle-mounted camera arranged in front of the vehicle, can be used as a camera system in an advanced driver assistance system to analyze video content and provide Lane Departure Warning (LDW), automatic Lane Keeping Assistance (LKA), high beam/low beam control and Traffic Sign Recognition (TSR); the device can be opened when the vehicle is parked in the position, so that the barrier in front of the vehicle can be seen visually, and the vehicle can be parked in the position more conveniently; when the automobile passes through a special place (such as a road block, a parking lot and the like), the front-view camera can be opened at any time to judge the driving environment, and the central system of the automobile can make a correct instruction so as to avoid the occurrence of driving accidents.

In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art: the existing forward-looking camera lens is low in resolution ratio and small in field depth range, long-distance detail presentation and wide-angle clear imaging cannot be simultaneously met, and the existing forward-looking camera lens cannot accurately judge the details of long-distance shooting in real time to give an early warning and avoid obstacles in the wide-angle range in front of a vehicle, so that driving risks exist.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an optical imaging system, an image capturing module and an electronic device to solve the above problems.

An embodiment of the present application provides an optical imaging system, sequentially from an object side to an image side, comprising:

a first lens having a negative bending force;

a second lens having a negative bending force;

a third lens having a positive refracting power;

a fourth lens having a positive refracting power;

a fifth lens having a negative refracting power;

a sixth lens having a positive refracting power;

a seventh lens having a positive refracting power;

the optical imaging system satisfies the following conditional expression:

-15.7<f2/f<-5.5；

wherein f2 is the focal length of the second lens, and f is the effective focal length of the optical imaging system.

The optical imaging system ensures high pixels, widens the imaging visual field range, not only increases the visual field angle range, but also enlarges the imaging range of the object space depth, can capture detail information beyond a long distance, can capture a shooting picture in a large angle range, and transmits the driving environment in a far distance and a wide range in front to the optical imaging system to be recognized or displayed on a display screen clearly, so that a driver can make accurate judgment and avoid accidents; clear vision can be provided for the driving of the driver in the aspect of driving records, and guarantee is provided for the safe driving of the driver; in the aspect of monitoring security protection, detail information can be clearly recorded, in addition, the second lens is set to be the negative lens, negative bending force can be provided for the optical imaging system, the width of light rays can be favorably enlarged, the light rays which are emitted after large-angle light rays are refracted by the first lens are widened and fully transmitted to a high-pixel imaging surface, and therefore a wider view field range is obtained, and the characteristic of high pixels of the optical imaging system can be favorably embodied.

In some embodiments, the optical imaging system further comprises:

the object side of the first lens is convex at the paraxial region, and the image side is concave at the paraxial region, the object side of the second lens is concave at the paraxial region, the object side and the image side of the fourth lens are convex at the paraxial region, and the object side and the image side of the fifth lens are concave at the paraxial region.

Therefore, the overall size of the optical imaging system can be effectively reduced by reasonably configuring the refractive power and the surface type of each lens, so as to meet the characteristic of miniaturization.

In some embodiments, the optical imaging system satisfies the following conditional expression:

2<f123/f<4；

wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical imaging system.

Therefore, the first lens, the second lens and the third lens can provide positive bending force for the optical imaging system integrally, so that the convergence of light beams of a front lens group (the first lens, the second lens and the third lens) of the optical imaging system and the incidence of light rays with a large-angle view field into the optical imaging system are controlled, and the wide angle of the optical imaging system is realized; meanwhile, the positive and negative lens combinations in the lens group can correct phase difference mutually, and the resolving power is improved, so that the high-quality imaging device is obtained.

6.3<SDs2/SAGs2<7；

wherein SDs2 is the clear aperture of the object side of the second lens, SAGs2 is the distance parallel to the optical axis from the maximum clear aperture of the object side of the second lens to the center point of the second lens.

Therefore, the lower limit of the conditional expression is met, the object side surface of the second lens can be prevented from being over-bent, the processing difficulty of the second lens is reduced, and the problems of over-bending and uneven film coating of the second lens are avoided; meanwhile, the incidence of large-angle light rays to the optical imaging system is not facilitated, so that the imaging quality of the optical imaging system is influenced; the upper limit of the conditional expression is met, the object side surface of the second lens can be prevented from being too flat, and the risk of generating ghost images is reduced.

4<f6/f<5.7；

wherein f6 is the focal length of the sixth lens, and f is the effective focal length of the optical imaging system.

Therefore, the sixth lens can provide positive bending force for the optical imaging system, correct chromatic aberration, reduce eccentricity sensitivity, be beneficial to correcting the aberration of the optical imaging system and improve imaging resolution; when the lower limit of the conditional expression is satisfied, the positive bending force does not become excessively strong, and therefore, the angle between the normal line of each of the object side and image side surfaces of the sixth lens element and the incident light ray does not become excessively large, and the occurrence of high-order aberration is easily suppressed.

3.5<f7/f<6.3；

wherein f7 is the focal length of the seventh lens, and f is the effective focal length of the optical imaging system.

Therefore, the seventh lens can provide positive bending force for the optical imaging system, correct chromatic aberration, reduce eccentricity sensitivity, be beneficial to correcting the optical imaging system aberration and improve imaging resolution.

-5.3mm<f4*f5/f<-4mm；

wherein f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the effective focal length of the optical imaging system.

Therefore, the lens group of the fourth lens with positive bending force and the fifth lens with negative bending force can correct aberration generated by the bending of the optical imaging light through the front lens and improve the resolving power of the optical imaging system; the angle of the light rays which are refracted by the lens group and then are emitted out of the optical imaging system is favorably reduced, so that the incident angle of the light rays which are emitted into the photosensitive element on the image side of the optical imaging system is reduced, the photosensitive performance of the photosensitive element is improved, and the high-quality imaging picture of the optical imaging system is improved.

9.5mm<f*tan(FOV/2)<10.5mm；

wherein FOV is the maximum field angle of the optical imaging system, and f is the effective focal length of the optical imaging system.

Therefore, the optical imaging system can be ensured to have high pixels, the shooting focal length and the distortion are reasonably set to obtain a better wide-angle shooting effect, and a sufficient field angle of the lens group is provided, so that the requirements of high field angles of electronic products such as mobile phones, cameras, vehicles, monitoring, medical treatment and the like are met.

3.3<RS7/CT7<6.7；

wherein RS7 is a curvature radius of an object-side surface of the seventh lens element at an optical axis, and CT7 is a thickness of the seventh lens element at the optical axis.

Therefore, the object side surface of the seventh lens is a convex surface, so that light rays can be further converged, the surface shape is smooth, and the incident angle deviation of the light rays with different viewing fields can be reduced, so that the sensitivity is reduced; through the reasonable setting to seventh lens thickness, can reduce the processing degree of difficulty and reduce thickness tolerance sensitivity, promote the yield.

An embodiment of the present application provides an get for instance module, includes:

the optical imaging system described above; and

a photosensitive element disposed on an image side of the optical imaging system.

The optical imaging system in the image capturing module ensures high pixels, widens the imaging visual field range, increases the visual field angle range, enlarges the imaging range of the object space depth, can capture detail information beyond a long distance, can capture a shooting picture in a large angle range, and more clearly transmits the driving environment in a far distance and a wide range in front to the optical imaging system for recognition or clearly displays the driving environment on a display screen, so that a driver can make accurate judgment and avoid accidents; clear vision can be provided for the driving of the driver in the aspect of driving records, and guarantee is provided for the safe driving of the driver; in the aspect of monitoring security protection, detail information can be clearly recorded, in addition, the second lens is set to be the negative lens, negative bending force can be provided for the optical imaging system, the width of light rays can be favorably enlarged, the light rays which are emitted after large-angle light rays are refracted by the first lens are widened and fully transmitted to a high-pixel imaging surface, and therefore a wider view field range is obtained, and the characteristic of high pixels of the optical imaging system can be favorably embodied.

An embodiment of the present application provides an electronic apparatus, including:

a housing; and

the image capturing module is mounted on the shell.

The optical imaging system in the electronic device not only ensures high pixel, but also widens the imaging visual field range, not only increases the visual field angle range, enlarges the imaging range of object space depth, can capture detail information beyond a long distance, and can capture a shooting picture in a large angle range, and more clearly transmits the driving environment in a far distance and a wide range in front to the optical imaging system for recognition or clearly displays the driving environment on a display screen, so that a driver can make accurate judgment and avoid accidents; clear vision can be provided for the driving of the driver in the aspect of driving records, and guarantee is provided for the safe driving of the driver; in the aspect of monitoring security protection, detail information can be clearly recorded, in addition, the second lens is set to be the negative lens, negative bending force can be provided for the optical imaging system, the width of light rays can be favorably enlarged, the light rays which are emitted after large-angle light rays are refracted by the first lens are widened and fully transmitted to a high-pixel imaging surface, and therefore a wider view field range is obtained, and the characteristic of high pixels of the optical imaging system can be favorably embodied.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention.

Fig. 2 is a schematic view of spherical aberration, astigmatism and distortion according to a first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.

Fig. 4 is a schematic diagram of spherical aberration, astigmatism and distortion according to a second embodiment of the present invention.

Fig. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention.

Fig. 6 is a schematic view of spherical aberration, astigmatism and distortion according to a third embodiment of the present invention.

Fig. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

Fig. 8 is a schematic view of spherical aberration, astigmatism and distortion according to a fourth embodiment of the present invention.

Fig. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

Fig. 10 is a schematic view of spherical aberration, astigmatism and distortion of a fifth embodiment of the present invention.

Fig. 11 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

Fig. 12 is a schematic view of spherical aberration, astigmatism and distortion according to a sixth embodiment of the present invention.

Fig. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Description of the main elements

Electronic device 1000

Image capturing module 100

Optical imaging system 10

First lens L1

Second lens L2

Third lens L3

Fourth lens L4

Fifth lens L5

Sixth lens L6

Seventh lens L7

Optical filter L8

Cover glass L9

Stop STO

Photosensitive element 20

Housing 200

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, the present invention provides an optical imaging system 10, which includes, in order from an object side to an image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, and a seventh lens L7 with positive bending force; the optical imaging system 10 further includes a stop STO disposed on the object side of the first lens L1, on the image side of the seventh lens L7, or between any two adjacent lenses of the first lens L1 to the seventh lens L7.

The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S8; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; the sixth lens L6 has an object-side surface S11 and an image-side surface S12; the seventh lens L7 has an object-side surface S13 and an image-side surface S14, wherein the image-side surface of the fourth lens L4 and the object-side surface of the fifth lens L5 are both cemented together as S9.

The object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens L2 is concave at paraxial region; the image-side surface S6 of the third lens element L3 is concave or convex at the paraxial region; the object-side surface S8 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are both concave at the paraxial region.

The optical imaging system 10 satisfies the following conditional expression:

-15.7<f2/f<-5.5；

wherein f2 is the focal length of the second lens L2, and f is the effective focal length of the optical imaging system 10.

The optical imaging system 10 can ensure high pixel, widen the imaging visual field range, increase the visual field range, enlarge the imaging range of the object space depth, capture the detail information beyond a long distance, capture the shooting picture in a large angle range, and transmit the driving environment in the front far and near distance and wide angle range to the optical imaging system 10 for recognition or display on the display screen clearly, so that a driver can make accurate judgment and avoid accidents; clear vision can be provided for the driving of the driver in the aspect of driving records, and guarantee is provided for the safe driving of the driver; in the aspect of monitoring security protection, detail information can be clearly recorded, in addition, the second lens is set to be the negative lens, negative bending force can be provided for the optical imaging system, the width of light rays can be favorably enlarged, the light rays which are emitted after large-angle light rays are refracted by the first lens are widened and fully transmitted to a high-pixel imaging surface, and therefore a wider view field range is obtained, and the characteristic of high pixels of the optical imaging system can be favorably embodied. However, when f2/f exceeds the above range, correction of aberration of the optical imaging system 10 is not facilitated, thereby reducing imaging quality.

In some embodiments, the optical imaging system 10 further includes a filter L8, and the filter L8 is an infrared cut filter. The filter L8 has an object side S15 and an image side S16. The optical filter L8 is disposed on an image-side surface or an object-side surface of any one of the first lens L1 to the seventh lens L7, or between the image-side surface S14 and the image surface S19 of the seventh lens L7, so as to filter out light rays in other wavelength bands, such as visible light, and only allow infrared light to pass through, and the separate arrangement of the optical filter L8 is beneficial to the assembly process of the optical imaging system 10; disposing filter L8 on the lens surface is more advantageous for maintaining image plane color balance. In some embodiments, the optical imaging system 10 further includes a transparent protective glass L9, the protective glass L9 has an object side surface S17 and an image side surface S18, and the protective glass L9 is disposed between the filter L8 and the image surface S19.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all made of plastic, and in this case, the plastic lens can reduce the weight of the optical imaging system 10 and reduce the production cost. In some embodiments, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are made of glass, so that the optical imaging system 10 can endure higher temperature and has better optical performance. In other embodiments, only the first lens L1 may be made of glass, and the other lenses are made of plastic, in which case, the first lens L1 closest to the object side can better withstand the influence of the ambient temperature on the object side, and the production cost of the optical imaging system 10 is kept low because the other lenses are made of plastic. Alternatively, in some embodiments, the material of the first lens L1 is glass, and the materials of the other lenses can be combined arbitrarily.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

2<f123/f<4；

wherein f123 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f is an effective focal length of the optical imaging system 10.

Thus, the first lens L1, the second lens L2, and the third lens L3 can provide a positive bending force for the optical imaging system 10 as a whole, which is beneficial to controlling the convergence of the light beams of the front lens group (the first lens L1, the second lens L2, and the third lens L3) of the optical imaging system 10 and the incidence of the light beams with a large-angle field of view into the optical imaging system 10, and is beneficial to the optical imaging system 10 to realize a wide angle; meanwhile, the positive and negative lens combinations in the lens group can correct phase difference mutually, and the resolving power is improved, so that the high-quality imaging device is obtained. However, when f123/f exceeds the above range, it is not favorable to control the convergence of the light beams of the front lens group of the optical imaging system 10 and the incidence of the light beams with a large angle of view into the optical imaging system 10, and it is not favorable to realize a wide angle of the optical imaging system 10.

6.3<SDs2/SAGs2<7；

wherein, SDs2 is the clear aperture of the object side of the second lens L2, SAGs2 is the distance parallel to the optical axis from the maximum clear aperture of the object side of the second lens L2 to the center point of the second lens L2.

Therefore, the lower limit of the conditional expression is met, the object side surface of the second lens L2 can be prevented from being bent too much, the processing difficulty of the second lens L2 is reduced, and the problems that the second lens L2 is bent too much and the coating film is not uniform are solved; meanwhile, the incidence of large-angle light rays to the optical imaging system 10 is not facilitated, so that the imaging quality of the optical imaging system 10 is influenced; satisfying the upper limit of the conditional expression can avoid the object-side surface of the second lens L2 from being too flat, and reduce the risk of generating ghost images. However, when the SDs2/SAGs2 is out of the above range, the object-side surface of the second lens L2 is excessively curved, and the difficulty in processing the second lens L2 is large.

4<f6/f<5.7；

wherein f6 is the focal length of the sixth lens L6, and f is the effective focal length of the optical imaging system 10.

Therefore, the sixth lens L6 can provide positive bending force for the optical imaging system 10, correct chromatic aberration, reduce eccentricity sensitivity, facilitate correction of aberration of the optical imaging system 10, and improve imaging resolution; when the lower limit of the conditional expression is satisfied, the positive bending force does not become excessively strong, and therefore, the angle between the normal line of each of the object side and image side surfaces of the sixth lens element L6 and the incident light ray does not become excessively large, and the occurrence of higher-order aberration is easily suppressed. However, when f6/f exceeds the above range, correction of aberration of the optical imaging system 10 is not facilitated, thereby reducing imaging quality.

3.5<f7/f<6.3；

wherein f7 is the focal length of the seventh lens L7, and f is the effective focal length of the optical imaging system 10.

Therefore, the seventh lens element L7 can provide positive bending force for the optical imaging system 10, correct chromatic aberration, reduce eccentricity sensitivity, facilitate correction of aberration of the optical imaging system 10, and improve imaging resolution. However, when f7/f exceeds the above range, correction of aberration of the optical imaging system 10 is not facilitated, thereby reducing imaging quality.

-5.3mm<f4*f5/f<-4mm；

wherein f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, and f is the effective focal length of the optical imaging system 10.

Thus, by providing the lens assembly of the fourth lens L4 with positive bending force and the fifth lens L5 with negative bending force, the aberration generated by the refraction of the optical imaging light 10 by the front lens can be corrected, and the resolving power of the optical imaging system 10 is improved; and the angle of the light rays exiting the optical imaging system 10 after being refracted by the lens group is favorably reduced, so that the incident angle of the light rays entering the photosensitive element on the image side of the optical imaging system 10 is reduced, the photosensitive performance of the photosensitive element is improved, and the high-quality imaging picture of the optical imaging system 10 is improved. However, when f4 × f5/f exceeds the upper limit of the conditional expression, it is not easy to suppress the occurrence of high-order aberration due to the light beam in the peripheral portion of the imaging region; if the lower limit of the conditional expression is exceeded, the suppression of achromatization is not favorable, and high resolution performance is obtained.

9.5mm<f*tan(FOV/2)<10.5mm；

where FOV is the maximum field angle of the optical imaging system 10 and f is the effective focal length of the optical imaging system 10.

Therefore, the optical imaging system 10 can be ensured to have high pixels, the shooting focal length and the distortion are reasonably set, a better wide-angle shooting effect can be obtained, and a sufficient field angle of the lens group is provided, so that the requirements of high field angles of electronic products such as mobile phones, cameras, vehicles, monitoring, medical treatment and the like are met. However, when f × tan (FOV/2) exceeds the above range, it is not favorable to obtain a better wide-angle photographing effect and provide a sufficient field angle of the lens group.

3.3<RS7/CT7<6.7；

wherein RS7 is a curvature radius of the object-side surface S13 of the seventh lens element L7 on the optical axis, and CT7 is a thickness of the seventh lens element L7 on the optical axis.

Thus, since the object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, light rays can be further converged, the surface shape is smooth, and the deviation of incident angles of light rays of different fields of view can be reduced, thereby reducing sensitivity; through the reasonable setting to seventh lens L7 thickness, can reduce the processing degree of difficulty and reduce thickness tolerance sensitivity, promote the yield. However, when the RS7/CT7 is beyond the above range, it is not favorable to reduce the incident angle deviation of the light rays in different fields, and is unfavorable to reduce the thickness tolerance sensitivity, and the yield is low.

First embodiment

Referring to fig. 1 and fig. 2, the optical imaging system 10 in this embodiment includes, in order from the object side to the image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a stop STO, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, a seventh lens L7 with positive bending force, a filter L8, and a protective glass L9.

An object side surface S1 of the first lens L1 is convex at the paraxial region, an image side surface S2 of the first lens L1 is concave at the paraxial region, an object side surface S3 of the second lens L2 is concave at the paraxial region, an image side surface S4 of the second lens L2 is convex at the paraxial region, an object side surface S5 of the third lens L3 is convex at the paraxial region, an image side surface S6 of the third lens L3 is concave at the paraxial region, an object side surface S7 of the fourth lens L4 is convex at the paraxial region, an image side surface S8 of the fourth lens L4 is convex at the paraxial region, an object side surface S8 of the fifth lens L8 is concave at the paraxial region, an image side surface S8 of the fifth lens L8 is concave at the paraxial region, an object side surface S8 of the sixth lens L8 is convex at the paraxial region, a second image side surface S8 of the second lens L8 is convex at the paraxial region, a paraxial region of the second region, a second region S8 is concave at the paraxial region.

When the optical imaging system 10 is used for imaging, light rays emitted or reflected by a subject enter the optical imaging system 10 from the object side direction, pass through the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the filter L8 in sequence, and finally converge on the image surface S19.

Table 1 shows a table of characteristics of the optical imaging system of the present embodiment, in which the reference wavelength of the first embodiment is 546.074nm, the reference wavelength of the refractive index and the abbe number is 587.56nm, and the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

Table 1

Where f is the effective focal length of the optical imaging system 10, FNO is the aperture size of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

In the present embodiment, the object-side surface S3 and the image-side surface S4 of the second lens L2, the image-side surface S12 of the sixth lens L6, and the object-side surface S13 and the image-side surface S14 of the seventh lens L7 are aspheric, and the surface shape Z of each spherical lens can be defined by, but is not limited to, the following aspheric formula.

Where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 2 gives the high-order term coefficients K, A4, a6, A8, a10 to a20 that can be used for each of the spherical mirror surfaces S3, S4, S12, S13, and S14 in the first embodiment.

Table 2

Number of noodles	S3	S4	S12	S13	S14
						K	-2.21E-01	-3.55E-01	-7.17E+00	-1.12E+00	-1.60E+01
A4	1.84E-04	4.76E-05	1.89E-04	-3.96E-04	-7.19E-04
						A6	9.61E-06	1.59E-06	5.61E-06	-2.86E-07	-3.10E-06
A8	-2.18E-07	-6.74E-08	1.56E-07	-1.24E-07	-7.29E-08
						A10	2.19E-09	9.89E-11	-6.88E-09	-4.38E-09	-1.18E-09
A12	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
						A14	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A16	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
						A18	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A20	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00

Fig. 2 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 of the first embodiment, wherein the longitudinal spherical aberration curves represent convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical imaging system 10; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2, the optical imaging system 10 according to the first embodiment can achieve good imaging quality.

Second embodiment

Referring to fig. 3 and 4, the optical imaging system 10 in this embodiment includes, in order from the object side to the image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a stop STO, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, a seventh lens L7 with positive bending force, a filter L8, and a protective glass L9.

An object side surface S1 of the first lens L1 is convex at the paraxial region, an image side surface S2 of the first lens L1 is concave at the paraxial region, an object side surface S3 of the second lens L2 is concave at the paraxial region, an image side surface S4 of the second lens L2 is convex at the paraxial region, an object side surface S5 of the third lens L3 is convex at the paraxial region, an image side surface S6 of the third lens L3 is concave at the paraxial region, an object side surface S7 of the fourth lens L4 is convex at the paraxial region, an image side surface S8 of the fourth lens L4 is convex at the paraxial region, an object side surface S8 of the fifth lens L8 is concave at the paraxial region, an image side surface S8 of the fifth lens L8 is concave at the paraxial region, an object side surface S8 of the sixth lens L8 is convex at the paraxial region, a second image side surface S8 of the second lens L8 is convex at the paraxial region, a paraxial region of the second region, a second region S8 is convex region.

Table 3 shows a table of characteristics of the optical imaging system 10 of the present embodiment, in which the reference wavelength of the second embodiment is 546.074nm, the reference wavelength of the refractive index and the abbe number is 587.56nm, and the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

Table 3

Where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 2 gives the high-order term coefficients K, A4, a6, A8, a10 to a20 that can be used for each of the spherical mirror surfaces S3, S4, S12, S13, and S14 in the second embodiment.

Table 4

Number of noodles	S3	S4	S12	S13	S14
						K	-2.18E-01	-3.23E-01	-2.11E+01	5.40E-01	-9.90E+01
A4	1.89E-04	5.46E-05	3.68E-04	2.91E-05	-4.67E-04
						A6	7.63E-06	1.96E-06	7.78E-07	-1.19E-05	-2.75E-06
A8	-1.59E-08	-5.49E-08	5.58E-07	6.52E-08	-1.07E-07
						A10	9.67E-10	7.69E-10	-1.78E-08	4.03E-09	6.10E-09
A12	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
						A14	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A16	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
						A18	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A20	0.00E+00	0.00E+00	0.00E+00	0.00E+00	0.00E+00

Fig. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 of the second embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of the light rays with different wavelengths after passing through the lenses of the optical imaging system 10; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4, the optical imaging system 10 according to the second embodiment can achieve good imaging quality.

Third embodiment

Referring to fig. 5 and 6, the optical imaging system 10 in this embodiment includes, in order from the object side to the image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a stop STO, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, a seventh lens L7 with positive bending force, a filter L8, and a protective glass L9.

An object side surface S1 of the first lens L1 is convex at the paraxial region, an image side surface S2 of the first lens L1 is concave at the paraxial region, an object side surface S3 of the second lens L2 is concave at the paraxial region, an image side surface S4 of the second lens L2 is convex at the paraxial region, an object side surface S5 of the third lens L3 is convex at the paraxial region, an image side surface S6 of the third lens L3 is convex at the paraxial region, an object side surface S7 of the fourth lens L4 is convex at the paraxial region, an image side surface S8 of the fourth lens L4 is convex at the paraxial region, an object side surface S8 of the fifth lens L8 is concave at the paraxial region, an image side surface S8 of the fifth lens L8 is concave at the paraxial region, an object side surface S8 of the sixth lens L8 is convex at the paraxial region, a second image side surface S8 of the second lens L8 is convex at the paraxial region, a paraxial region of the second region, a second region S8 is concave at the paraxial region.

Table 5 shows a table of characteristics of the optical imaging system of the present embodiment, in which the reference wavelength of the third embodiment is 546.074nm, the reference wavelength of the refractive index and the abbe number is 587.56nm, and the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

Table 5

Where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of curvature radius), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 5 gives the high-order term coefficients K, A4, a6, A8, a10 to a20 that can be used for each of the spherical mirror surfaces S3, S4, S12, S13, and S14 in the third embodiment.

Table 6

Number of noodles

S3

S4

S11

S12

S13

S14

K

-3.00E-01

-5.61E-01

1.75E+01

-1.29E+00

-2.50E+00

3.13E+01

A4

2.43E-04

5.42E-05

-9.03E-04

-4.16E-05

-8.72E-05

-7.65E-04

A6

8.38E-06

2.16E-06

-6.36E-06

-1.21E-05

-6.99E-06

-2.64E-06

A8

6.08E-08

-1.70E-08

-1.02E-06

5.46E-07

-2.53E-07

-1.50E-07

A10

-3.76E-09

-6.82E-10

9.12E-08

1.41E-08

5.30E-09

4.56E-09

A12

-8.04E-22

2.76E-21

-1.96E-21

-6.78E-22

3.90E-20

-4.36E-20

A14

0.00E+00

A16

0.00E+00

A18

0.00E+00

A20

0.00E+00

Fig. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 of the third embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of the light rays with different wavelengths after passing through the lenses of the optical imaging system 10; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6, the optical imaging system 10 according to the third embodiment can achieve good imaging quality.

Fourth embodiment

Referring to fig. 7 and 8, the optical imaging system 10 in this embodiment includes, in order from the object side to the image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a stop STO, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, a seventh lens L7 with positive bending force, a filter L8, and a protective glass L9.

Table 7 shows a table of characteristics of the optical imaging system of the present embodiment, in which the reference wavelength of the fourth embodiment is 546.074nm, the reference wavelength of the refractive index and the abbe number is 587.56nm, and the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

Table 7

Where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 2 gives the high-order term coefficients K, A4, a6, A8, a10 to a20 that can be used for each of the spherical mirror surfaces S3, S4, S12, S13, and S14 in the fourth embodiment.

Table 8

Number of noodles

S3

S4

S11

S12

S13

S14

K

-2.82E-01

-5.63E-01

9.90E+01

-4.57E+00

1.13E+00

-9.90E+01

A4

2.37E-04

6.07E-05

-4.99E-04

2.11E-04

1.38E-06

-5.28E-04

A6

8.07E-06

1.88E-06

-6.03E-06

-3.03E-06

-7.12E-06

-2.98E-06

A8

1.41E-07

6.45E-09

-9.37E-07

-5.13E-07

-8.23E-08

-4.45E-08

A10

-4.38E-09

-5.99E-10

1.85E-09

3.59E-09

4.71E-10

1.77E-09

A12

-5.29E-21

-7.62E-21

-5.26E-21

3.78E-21

4.89E-21

-4.67E-21

A14

0.00E+00

A16

0.00E+00

A18

0.00E+00

A20

0.00E+00

Fig. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 of the fourth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of the light rays with different wavelengths after passing through the lenses of the optical imaging system 10; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 8, the optical imaging system 10 according to the fourth embodiment can achieve good imaging quality.

Fifth embodiment

Referring to fig. 9 and 10, the optical imaging system 10 in this embodiment includes, in order from the object side to the image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a stop STO, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, a seventh lens L7 with positive bending force, a filter L8, and a protective glass L9.

Table 9 shows a table of characteristics of the optical imaging system of the present embodiment, in which the reference wavelength of the fifth embodiment is 546.074nm, the reference wavelength of the refractive index and the abbe number is 587.56nm, and the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

Table 9

Where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of curvature radius), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 10 gives the high-order term coefficients K, A4, a6, A8, a10 to a20 that can be used for each of the spherical mirror surfaces S3, S4, S12, S13, and S14 in the fifth embodiment.

Table 10

Number of noodles

S3

S4

S11

S12

S13

S14

K

-3.12E-01

-6.71E-01

6.82E+01

-5.52E+00

2.30E+00

-9.90E+01

A4

3.47E-04

8.28E-05

-4.79E-04

4.07E-04

1.10E-04

-6.53E-04

A6

9.49E-06

1.66E-06

5.82E-06

1.96E-07

-1.51E-05

-7.94E-07

A8

4.43E-08

-6.66E-09

-1.57E-06

-3.99E-07

9.05E-09

-1.10E-07

A10

-2.07E-09

-3.95E-10

6.26E-08

1.75E-08

2.89E-10

2.19E-09

A12

1.57E-19

8.48E-21

5.45E-21

1.85E-19

3.38E-22

-7.10E-21

A14

0.00E+00

A16

0.00E+00

A18

0.00E+00

A20

0.00E+00

Fig. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 of the fifth embodiment, wherein the longitudinal spherical aberration curves represent convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical imaging system 10; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 10, the optical imaging system 10 according to the fifth embodiment can achieve good imaging quality.

Sixth embodiment

Referring to fig. 11 and 12, the optical imaging system 10 in this embodiment includes, in order from the object side to the image side, a first lens L1 with negative bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a stop STO, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, a seventh lens L7 with positive bending force, a filter L8, and a protective glass L9.

Table 11 shows a table of characteristics of the optical imaging system of the present embodiment, in which the reference wavelength of the sixth embodiment is 546.074nm, the reference wavelength of the refractive index and the abbe number is 587.56nm, and the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

Table 11

Where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of curvature radius), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 12 gives the high-order term coefficients K, A4, a6, A8, a10 to a20 that can be used for each of the spherical mirror surfaces S3, S4, S12, S13, and S14 in the sixth embodiment.

Table 12

Number of noodles

S3

S4

S11

S12

S13

S14

K

-3.15E-01

-7.62E-01

9.88E+01

-5.49E+00

2.13E+00

-2.85E+01

A4

3.19E-04

1.42E-04

-8.38E-04

8.14E-05

2.37E-04

-2.34E-04

A6

1.19E-05

2.55E-06

-2.13E-05

-1.76E-05

-1.14E-05

-2.87E-06

A8

-8.41E-08

7.31E-08

-1.56E-06

-4.53E-08

3.29E-08

-3.77E-07

A10

6.11E-09

-6.52E-10

1.36E-07

4.46E-08

-4.28E-09

4.20E-09

A12

-3.22E-23

-5.79E-21

-1.98E-20

1.90E-21

8.20E-21

-1.06E-20

A14

0.00E+00

A16

0.00E+00

A18

0.00E+00

A20

0.00E+00

Fig. 12 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 of the sixth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of the light rays with different wavelengths after passing through the lenses of the optical imaging system 10; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 12, the optical imaging system 10 according to the sixth embodiment can achieve good imaging quality.

Table 13 shows values of f2/f, f123/f, SDs2/SAGs2, f6/f, f7/f, f4 f5/f, f tan (FOV/2), and RS7/CT7 in the optical imaging systems of the first to sixth embodiments.

Table 13

	f2/f	f123/f	SDs2/SAGs2	f6/f
					First embodiment	-12.882	3.321	6.628	5.348
Second embodiment	-15.656	2.278	6.332	5.082
					Third embodiment	-7.040	3.593	6.973	5.649
Fourth embodiment	-8.065	2.821	6.842	4.142
					Fifth embodiment	-7.741	2.780	6.816	5.048
Sixth embodiment	-5.513	3.956	6.799	4.823
						f7/f	f4*f5/f	f*tan(FOV/2)	RS7/CT7
First embodiment	4.359	-5.277	9.838	3.311
					Second embodiment	3.534	-4.150	9.674	6.072
Third embodiment	4.339	-5.229	9.918	4.522
					Fourth embodiment	5.552	-5.043	9.836	5.456
Fifth embodiment	4.217	-4.481	9.906	5.288
					Sixth embodiment	6.238	-4.701	10.223	6.631

Referring to fig. 13, the optical imaging system 10 of the embodiment of the present invention can be applied to the image capturing module 100 of the embodiment of the present invention. The image capturing module 100 includes a photosensitive element 20 and the optical imaging system 10 of any of the above embodiments. The photosensitive element 20 is disposed on the image side of the optical imaging system 10.

The photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD).

The optical imaging system 10 in the image capturing module 100 increases the focal length while satisfying the micro design, has a smaller field angle than a conventional optical imaging system, improves the relative brightness, can achieve a clear imaging effect even when being taken in a dark environment, can be used for taking a long-distance view, improves the magnification, and has functions of depth of field blurring and the like.

Referring to fig. 13, the image capturing module 100 according to the embodiment of the present invention can be applied to the electronic device 1000 according to the embodiment of the present invention. The electronic device 1000 includes a housing 200 and an image capturing module 100, wherein the image capturing module 100 is mounted on the housing 200.

The utility model discloses on-vehicle, autopilot and monitoring device can be applied to electronic device 1000 of embodiment, wherein electronic device 1000 includes but is not limited to for vehicle event data recorder, smart mobile phone, panel computer, notebook computer, electron books read ware, Portable Multimedia Player (PMP), portable phone, videophone, digital still camera, mobile medical device, wearable equipment etc. support the electron device of formation of image.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An optical imaging system, comprising, in order from an object side to an image side:

a first lens having a negative bending force;

a second lens having a negative bending force;

a third lens having a positive refracting power;

a fourth lens having a positive refracting power;

a fifth lens having a negative refracting power;

a sixth lens having a positive refracting power;

a seventh lens having a positive refracting power;

the optical imaging system satisfies the following conditional expression:

-15.7<f2/f<-5.5；

2. The optical imaging system of claim 1, further comprising:

3. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

2<f123/f<4；

4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

6.3<SDs2/SAGs2<7；

5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

4<f6/f<5.7；

6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

3.5<f7/f<6.3；

7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

-5.3mm<f4*f5/f<-4mm；

8. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

9.5mm<f*tan(FOV/2)<10.5mm；

9. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

3.3<RS7/CT7<6.7；

10. An image capturing module, comprising:

the optical imaging system of any one of claims 1 to 9; and

11. An electronic device, comprising:

a housing; and

the image capturing module as claimed in claim 10, wherein the image capturing module is mounted on the housing.