CN113805318A

CN113805318A - Camera lens, camera module and shooting equipment

Info

Publication number: CN113805318A
Application number: CN202111211601.3A
Authority: CN
Inventors: 李云洪
Original assignee: Chengdu Weizheng Digital Technology Co ltd
Current assignee: Chengdu Weizheng Digital Technology Co ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2021-12-17

Abstract

A camera lens relates to the field of optical lenses and comprises: a first lens group and a second lens group arranged in order from an object side to an image side; the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from the object side to the image side; the second lens group comprises an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens which are arranged in sequence from the object side to the image side; the focal length of the first lens group is f1, the focal length of the second lens group is f2, and the total focal length of the camera lens is f, which satisfy the relation: 2.0f < f1<65 f; 1.5f < f2<2.1 f; the image quality can be further improved, and the problem of chromatic aberration can be better solved.

Description

Camera lens, camera module and shooting equipment

Technical Field

The invention relates to the field of optical lenses, in particular to a camera lens, a camera module and shooting equipment.

Background

In movie equipment, Nikon, Canon, Sony and the like in foreign countries are mainstream brands, and the production design of domestic lens is blank. Domestic photography enthusiasts are numerous and the demand quantity is large, but the price of the matched lens is high, the cost performance is low, and the method is a heavy burden for the economy of the ordinary photography enthusiasts.

In view of this, the present application is specifically made.

Disclosure of Invention

A first object of the present invention is to provide a camera lens which can further improve image quality and can better solve the problem of chromatic aberration.

A second objective of the present invention is to provide a camera module, which can further improve the image quality by using the camera lens, so as to better improve the image quality.

A third object of the present invention is to provide a photographing apparatus having a higher image quality, which satisfies the image quality requirements of the photographing enthusiasts.

The embodiment of the invention is realized by the following steps:

a camera lens, comprising: a first lens group and a second lens group arranged in order from an object side to an image side;

the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from the object side to the image side;

the second lens group comprises an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens which are arranged in sequence from the object side to the image side;

the focal length of the first lens group is f1, the focal length of the second lens group is f2, and the total focal length of the camera lens is f, which satisfy the relation: 2.0f < f1<65 f; 1.5f < f2<2.1 f.

Further, the first lens is a negative lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a negative lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the seventh lens is a positive lens;

the eighth lens element is a negative lens element, the ninth lens element is a positive lens element, the tenth lens element is a negative lens element, the eleventh lens element is a positive lens element, the twelfth lens element is a negative lens element, the thirteenth lens element is a positive lens element, and the fourteenth lens element is a positive lens element.

Further, convex surfaces of the first lens, the second lens, the third lens, the fourth lens, the seventh lens, the ninth lens, the eleventh lens, the thirteenth lens and the fourteenth lens face the object side;

the concave surfaces of the fifth lens, the sixth lens, the eighth lens, the tenth lens and the twelfth lens face the object side.

Further, the first lens and the second lens are a group of double-cemented lenses; the tenth lens and the eleventh lens are a set of cemented doublets, and the twelfth lens and the thirteenth lens are a set of cemented doublets.

Further, a diaphragm assembly is arranged between the seventh lens and the eighth lens;

the diaphragm assembly and the second lens group can move along the optical axis of the camera lens relative to the first lens group synchronously so as to adjust the focal length of the camera lens.

Further, the eighth lens is an aspheric lens, and a concave surface of the eighth lens faces the diaphragm assembly.

Further, the distance between the first lens group and the second lens group is d1, the distance that the diaphragm assembly and the second lens group move when the object distance of the camera lens is 300mm is d2, the total focal length of the camera lens is f, and the total optical length of the camera lens is ttl; it satisfies the relation: (7.9/ttl) < d2/d1< (16.3/f).

Further, a distance between the first lens group and the second lens group is d1, a total focal length of the camera lens is f, and an optical total length of the camera lens is ttl, which satisfies the relation: 0.14f < d1<0.22 ttl.

A camera module comprises the camera lens; and the photosensitive element is positioned at the image side of the camera lens and is used for receiving the optical signal passing through the optical lens and converting the optical signal into an electric signal.

A photographing apparatus includes a camera module; and the camera module is arranged on the shell.

The embodiment of the invention has the beneficial effects that:

according to the camera lens provided by the embodiment of the invention, the number and the material of the first lens group and the second lens group are reasonably selected and matched, and the focal power of the first lens group and the second lens group is reasonably distributed, so that the assembly sensitivity of the camera lens is low, the first lens group and the second lens group respectively adopt the cemented lens group, the problems of poor film-coated reflectivity at the edge of a large-curvature lens and high-energy ghost are avoided, and the chromatic aberration of the camera lens is perfectly corrected; and an aspheric lens is adopted near the diaphragm, so that off-axis high-order aberration is well corrected.

In general, the camera lens provided by the embodiment of the invention can further improve the image quality and better solve the problem of chromatic aberration.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first lens group and a second lens group according to an embodiment of the present invention;

FIG. 3 is a graph of MTF provided by an embodiment of the present invention;

FIG. 4 is an optical distortion diagram provided by an embodiment of the present invention;

FIG. 5 is a full field MTF plot provided by an embodiment of the present invention;

fig. 6 is a graph of relative illuminance provided by an embodiment of the present invention.

Icon: 1-a first lens group, 2-a second lens group, 3-a diaphragm component and 4-a photosensitive element;

11-first lens, 12-second lens, 13-third lens, 14-fourth lens, 15-fifth lens, 16-sixth lens, 17-seventh lens;

21-eighth lens, 22-ninth lens, 23-tenth lens, 24-eleventh lens, 25-twelfth lens, 26-thirteenth lens, 27-fourteenth lens.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "parallel," "perpendicular," and the like do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

The terms "substantially", "essentially", and the like are intended to indicate that the relative terms are not required to be absolutely exact, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and some deviation generally exists. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", and the like are used in a similar manner to those described above.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1 to 6, the present embodiment provides a camera lens, including: a first lens group 1, a second lens group 2, a diaphragm assembly 3 and a photosensitive element 4.

The first lens group 1 and the second lens group 2 are arranged in sequence from the object side to the image side;

the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, and a seventh lens 17, which are arranged in order from the object side to the image side;

the second lens group 2 includes an eighth lens 21, a ninth lens 22, a tenth lens 23, an eleventh lens 24, a twelfth lens 25, a thirteenth lens 26, and a fourteenth lens 27, which are arranged in order from the object side to the image side;

the focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, and the total focal length of the camera lens is f, which satisfy the following relation: 2.0f < f1<65 f; 1.5f < f2<2.1 f.

The obtained image optical signals can be subjected to multiple transmission by arranging the first lens group 1 and the second lens group 2, the focal powers of the first lens group 1 and the second lens group 2 are reasonably distributed, the assembly sensitivity of the lens is reduced, the assembly and the use of the lens are facilitated, and secondly, the focal lengths of the first lens group 1 and the second lens group 2 are limited, so that the optical signal transmission efficiency between the first lens group 1 and the second lens group 2 is higher, and better image quality is obtained.

Further, the first lens 11 is a negative lens, the second lens 12 is a positive lens, the third lens 13 is a negative lens, the fourth lens 14 is a negative lens, the fifth lens 15 is a positive lens, the sixth lens 16 is a negative lens, and the seventh lens 17 is a positive lens;

the eighth lens 21 is a negative lens, the ninth lens 22 is a positive lens, the tenth lens 23 is a negative lens, the eleventh lens 24 is a positive lens, the twelfth lens 25 is a negative lens, the thirteenth lens 26 is a positive lens, and the fourteenth lens 27 is a positive lens.

Further, convex surfaces of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the seventh lens 17, the ninth lens 22, the eleventh lens 24, the thirteenth lens 26, and the fourteenth lens 27 are directed toward the object side;

the fifth lens 15, the sixth lens 16, the eighth lens 21, the tenth lens 23, and the twelfth lens 25 are all concave toward the object side.

Further, the first lens 11 and the second lens 12 are a set of double cemented lenses; the tenth lens 23 and the eleventh lens 24 are a set of double cemented lenses, and the twelfth lens 25 and the thirteenth lens 26 are a set of double cemented lenses.

By arranging three groups of double cemented lenses with large refractive index difference and dispersion difference, chromatic aberration can be corrected more perfectly.

In addition, in the first lens group 1, the first lens 11 and the second lens 12 are set as a set of double-cemented lens, so that the problems of poor film-coated reflectivity, high cost and high-energy ghost at the edge of the large-curvature lens are better avoided.

Further, the eighth lens 21 is an aspheric lens, and a concave surface of the eighth lens 21 faces the diaphragm assembly.

Further, a diaphragm assembly 3 is arranged between the seventh lens 17 and the eighth lens 21;

by arranging the diaphragm assembly 3 between the seventh lens 17 and the eighth lens 21 and arranging the eighth lens 21 as an aspheric lens, high-level off-axis aberration can be corrected well, so that the number of lenses of the system is reduced, and the aspheric lens is made of practical conventional materials and has standard surface shape, so that the production cost of the whole lens can be effectively reduced.

In the present embodiment, the stop assembly 3 is disposed between the seventh lens 17 and the eighth lens 21, which means that the stop assembly 3 may be disposed on the seventh lens 17, or the stop assembly 3 may be disposed on the eighth lens 21, or the stop assembly 3 may be disposed at any position of the interval between the seventh lens 17 and the eighth lens 21. In the present embodiment, the diaphragm assembly 3 is disposed on the object side surface of the eighth lens 21.

In an actual use process, the diaphragm assembly 3 and the second lens 12 group 2 can move synchronously relative to the first lens 11 group 1 along the optical axis of the camera lens to adjust the focal length of the camera lens, such a moving manner is a conventional prior art in the field, and details are not described here, and through the synchronous movement of the diaphragm assembly 3 and the second lens 12 group 2 relative to the first lens 11 group 1, the object distance focusing of infinity to 0.3m can be realized.

Further, the distance between the first lens group 1 and the second lens group 2 is d1, the distance that the diaphragm assembly 3 and the second lens group 2 move when the object distance of the camera lens is 300mm is d2, the total focal length of the camera lens is f, and the total optical length of the camera lens is ttl; it satisfies the relation: (7.9/ttl) < d2/d1< (16.3/f).

Further, the distance between the first lens group 1 and the second lens group 2 is d1, the total focal length of the camera lens is f, and the total optical length of the camera lens is ttl, which satisfies the relation: 0.14f < d1<0.22 ttl.

In this embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, the eighth lens 21, the ninth lens 22, the tenth lens 23, the eleventh lens 24, the twelfth lens 25, the thirteenth lens 26, and the fourteenth lens 27 are made of glass.

In addition, in the implementation process, the refractive index of the first lens 11 is more than 1.80 and less than 2.11, the dispersion is more than 16 and less than 33; the refractive index of the second lens 12 is more than 1.60 and less than 1.89, and the dispersion is more than 39 and less than 64; the refractive index of the third lens 13 is more than 1.69 and less than 1.90, and the dispersion is more than 30 and less than 52; the refractive index of the fourth lens 14 is more than 1.59 and less than 1.82, and the dispersion is more than 42 and less than 67; the refractive index of the fifth lens 15 is more than 1.65 and less than 2.11, the dispersion is more than 16 and less than 29; the refractive index of the sixth lens 16 is more than 1.43 and less than 1.75, and the dispersion is more than 49 and less than 96; the refractive index of the seventh lens 17 is more than 1.68 and less than 2.11, and the dispersion is more than 16 and less than 33;

the refractive index of the eighth lens 21 is more than 1.70 and less than 1.91, and the dispersion is more than 31 and less than 55; the refractive index of the ninth lens 22 is more than 1.61 and less than 1.89, and the dispersion is more than 38 and less than 62; the refractive index of the tenth lens 23 is more than 1.70 and less than 2.11, and the dispersion is more than 16 and less than 42; the refractive index of the eleventh lens 24 is more than 1.60 and less than 1.89, and the dispersion is more than 39 and less than 64; the refractive index of the twelfth lens 25 is more than 1.73 and less than 2.11, and the dispersion is more than 16 and less than 32.5; the refractive index of the thirteenth lens 26 is greater than 1.43 and less than 1.78, the dispersion is greater than 49 and less than 96; the fourteenth lens 27 has a refractive index greater than 1.71 and less than 2.11 and a dispersion greater than 16 and less than 30.

In the specific implementation, the parameters of each lens are selected as shown in table 1:

table 1 provides two specific sets of parameters for each lens, for the specific parameter selection of the respective lens.

In addition, in the implementation process, the aspheric surface coefficient of the eighth lens can refer to table 2;

number of noodles

K

A4

A6

A8

A10

A12

A14

R1

-6.22

-4.35E-06

1.05E-07

-4.12E-10

-1.82E-11

2.03E-13

-4.35E-06

R2

-4.01

2.45E-05

2.31E-09

2.70E-10

-9.63E-12

8.68E-14

2.45E-05

Table 2 provides two sets of data, R1 and R2, for aspheric coefficients of the eighth lens.

In the camera lens provided in this embodiment, the effective focal length F is 25mm, and the relative aperture F is 2.1, please refer to fig. 2, it can be seen that at the spatial frequency of 30, the MTF value of the central field is above 0.85, and the MTF value of the full field is above 0.8, so that the lens is clear in imaging and superior in performance.

Fig. 3 is a field curvature and a distortion curve of the camera lens in this embodiment, and it can be seen that the meridional field curvature and the sagittal field curvature are greater than-0.08 and less than 0.04, and the maximum distortion is-2%, both of which satisfy the requirements of imaging performance.

Fig. 4 is MTF curves of the camera lens in this embodiment at spatial frequencies of 10, 30, and 60 respectively in the full field angle, and it can be seen that the MTF curves are gradually changed from the 0 ° field edge of the central field, and the performance of the lens is stable.

Fig. 5 is a relative illumination curve of the camera lens according to the embodiment, it can be seen that the relative illumination of the edge is greater than 58%, and a dark corner is not caused during photographing, so that the imaging performance requirement is met.

According to the camera lens provided by the embodiment of the invention, the first lens group 1 and the second lens group 2 are reasonably selected and matched, and the focal power of the first lens group and the second lens group is reasonably distributed, so that the assembly sensitivity of the camera lens is low, the first lens group 1 and the second lens group 2 respectively adopt the cemented lens group, the problems of poor film-coated reflectivity at the edge of a large-curvature lens and high-energy ghost are avoided, and the chromatic aberration of the camera lens is perfectly corrected; and an aspheric lens is adopted near the diaphragm, so that off-axis high-order aberration is well corrected.

The embodiment also provides a camera module, which comprises the camera lens; and the photosensitive element 4 is positioned at the image side of the camera lens, and the photosensitive element 4 is used for receiving the optical signal passing through the optical lens and converting the optical signal into an electric signal.

In this embodiment, the photosensitive element 4 may be a photosensitive element 4 in the conventional prior art, which is not described herein.

The embodiment also provides shooting equipment, which comprises a camera module; and the camera module is arranged on the shell.

In a specific implementation process, the first lens group 1, the second lens group 2 and the photosensitive element 4 may be connected to the housing in a clamping and bonding manner, which is a conventional technique in the art and is not described herein again.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A camera lens, comprising: a first lens group and a second lens group arranged in order from an object side to an image side;

a focal length of the first lens group is f1, a focal length of the second lens group is f2, a total focal length of the camera lens is f, which satisfies the relation: 2.0f < f1<65 f; 1.5f < f2<2.1 f.

2. The camera lens according to claim 1, wherein the first lens is a negative lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a negative lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the seventh lens is a positive lens;

the eighth lens is a negative lens, the ninth lens is a positive lens, the tenth lens is a negative lens, the eleventh lens is a positive lens, the twelfth lens is a negative lens, the thirteenth lens is a positive lens, and the fourteenth lens is a positive lens.

3. The camera lens according to claim 2, wherein convex surfaces of the first lens, the second lens, the third lens, the fourth lens, the seventh lens, the ninth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens face an object side;

concave surfaces of the fifth lens, the sixth lens, the eighth lens, the tenth lens, and the twelfth lens face the object side.

4. The camera lens of claim 1, wherein the first lens and the second lens are a set of double cemented lenses; the tenth lens and the eleventh lens are a set of double cemented lenses, and the twelfth lens and the thirteenth lens are a set of double cemented lenses.

5. The camera lens according to claim 1, wherein a diaphragm assembly is disposed between the seventh lens and the eighth lens;

6. The camera lens of claim 5, wherein the eighth lens is an aspheric lens, and a concave surface of the eighth lens faces the diaphragm assembly.

7. The camera lens according to claim 5, wherein a distance between the first lens group and the second lens group is d1, a distance moved by the stop assembly and the second lens group when an object distance is 300mm is d2, a total focal length of the camera lens is f, and an optical total length of the camera lens is ttl; it satisfies the relation: (7.9/ttl) < d2/d1< (16.3/f).

8. A camera lens according to claim 1, wherein the distance between the first lens group and the second lens group is d1, the total focal length of the camera lens is f, the total optical length of the camera lens is ttl, and the relation: 0.14f < d1<0.22 ttl.

9. A camera module comprising the camera lens of any one of claims 1 to 8; and the photosensitive element is positioned at the image side of the camera lens and used for receiving the optical signal passing through the optical lens and converting the optical signal into an electric signal.

10. A photographing apparatus comprising the camera module of claim 9; and the camera module is arranged on the shell.