CN108873271A - Telephoto lens, focal length camera mould group and electronic device - Google Patents

Abstract

The invention discloses a telephoto lens, a telephoto camera module and an electronic device. The telephoto lens according to the embodiment of the present invention sequentially includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with refractive power, and a fourth lens with refractive power from the object side to the image side. The object side surface of the first lens is convex. Both the object side and the image side of the second lens are concave. The object side of the third lens is concave. The telephoto lens satisfies the following relationship TTL/f<0.96; wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the telephoto lens, and f is the effective focal length of the telephoto lens. The telephoto lens in the embodiment of the present invention has a shorter TTL through a reasonable TTL configuration, thereby shortening the length of the lens barrel of the telephoto lens.

Description

Telephoto lens, telephoto camera module and electronic device

technical field

The invention relates to optical imaging technology, in particular to a telephoto lens, a telephoto camera module and an electronic device.

Background technique

A telephoto lens has a long focal length, a small viewing angle, and a large image on the film. Therefore, at the same distance, it can shoot larger images than standard lenses, which is suitable for shooting distant objects. Because its depth of field range is smaller than that of standard lenses, it can blur the background more effectively to highlight the focused subject, and the subject is generally far away from the camera, so the distortion in the perspective of the portrait is smaller, and the portrait taken is more vivid. , so people often refer to telephoto lenses as portrait lenses. However, telephoto lenses generally have longer barrels.

Contents of the invention

In view of this, embodiments of the present invention provide a telephoto lens, a telephoto camera module, and an electronic device.

The telephoto lens according to the embodiment of the present invention sequentially includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with refractive power, and a fourth lens with refractive power from the object side to the image side . The object side surface of the first lens is convex. Both the object side and the image side of the second lens are concave. The object side of the third lens is concave. The telephoto lens satisfies the following relationship: TTL/f<0.96; wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the telephoto lens, and f is the telephoto lens The effective focal length of the lens.

The telephoto lens in the embodiment of the present invention has a shorter TTL through a reasonable TTL configuration, thereby shortening the length of the lens barrel of the telephoto lens.

In some embodiments, the telephoto lens satisfies the following relationship: f1/f<0.51; wherein, f1 is the focal length of the first lens.

When the above relationship is satisfied, the first lens has an appropriate focal length, which is conducive to achieving a balance between expanding the field of view of the telephoto lens and shortening the total optical length of the telephoto lens, and has a larger depth of field, making it easier to focus.

In some implementations, the telephoto lens satisfies the following relationship: SD/TTL<0.75; wherein, SD is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens .

When the above relational expression is satisfied, the length of the device (lens barrel) for fixing all the lenses can be shortened, which is beneficial to production and improves yield.

In some implementations, the telephoto lens satisfies the following relationship: OA/IMA<0.4; wherein, OA is the maximum effective diameter of the lenses from the first lens to the fourth lens, and IMA is the maximum effective diameter of the photosensitive element at The length of the diagonal of the imaging plane.

When the above relational expression is satisfied, it is beneficial to the miniaturization of the telephoto lens and satisfies the requirement of high pixel.

In some embodiments, the telephoto lens satisfies the following relationship: -5<R4/R5<0; wherein, R4 is the radius of curvature of the image side of the second lens, and R5 is the radius of curvature of the third lens The radius of curvature of the side of the object.

When the above relationship is satisfied, the shapes of the second lens and the third lens can be well matched, which is not only beneficial to the processing and manufacturing of the second lens and the third lens and the assembly of the telephoto lens, improving the product yield, but also conducive to correction aberrations.

In some embodiments, the telephoto lens further includes an aperture, and the telephoto lens satisfies the following relationship: 0.2<SL/TTL<0.9; wherein, SL is the distance between the aperture and the imaging plane. distance on the axis.

When the above relationship is satisfied, the exit pupil of the telephoto lens can be kept away from the imaging surface, so the light will be incident on the photosensitive element in a manner close to vertical incidence, which is beneficial to realize the telecentric characteristics of the image side, thus making the photosensitive element sensitive to light. The height is improved, reducing the possibility of vignetting in the system.

In some implementations, the telephoto lens satisfies the following relationship: 0.5<CT1/D<1; wherein, CT1 is the central thickness of the first lens, and D is the Y radius of the first lens.

When the above relationship is satisfied, the first lens has a relatively suitable size, which is beneficial to improving the imaging quality of the telephoto lens and shortening the height of the telephoto lens, and can also reduce the difficulty of molding, improve the yield rate, and reduce the cost.

In some embodiments, the first lens to the fourth lens are plastic lenses or glass lenses, and the telephoto lens satisfies the following relationship: 0≤N≤4; wherein, N is the first lens up to the number of glass lenses used in the fourth lens.

In this way, the telephoto lens is conducive to correcting aberrations and solving temperature drift problems through a reasonable configuration of lens materials. In addition, the use of four lenses is light in weight, and the production cost can be reduced and satisfactory optical performance can be achieved through reasonable focal power matching.

In some embodiments, at least one surface of the first lens to the fourth lens is aspherical.

In this way, the telephoto lens can reduce the number of lenses and effectively shorten the total length of the telephoto lens by adjusting the curvature radius and aspheric coefficient of the lens surface, and the use of diversified surface types can effectively correct the aberration of the telephoto lens , to improve image quality.

A telephoto camera module according to an embodiment of the present invention includes a photosensitive element and a telephoto lens according to any one of the above embodiments. The photosensitive element is arranged on the image side of the telephoto lens.

The reasonable TTL configuration of the telephoto camera module in the embodiment of the present invention has a shorter TTL, thereby shortening the length of the lens barrel of the telephoto lens.

An electronic device in an embodiment of the present invention includes a casing and the telephoto camera module in the above embodiments. The telephoto camera module is installed on the housing.

The electronic device in the embodiment of the present invention has a shorter TTL through a reasonable TTL configuration, thereby shortening the length of the lens barrel of the telephoto lens.

In some implementations, the electronic device further includes a wide-angle camera module, the wide-angle camera is installed on the housing, and the electronic device can obtain telephoto images through the telephoto camera module and the wide-angle camera module The group acquires wide-angle images.

In this way, the electronic device can be used in conjunction with a wide-angle camera module with a short system effective focal length and a wider viewing angle installed on the casing. When capturing images, the electronic device will allow the user to switch between different camera functions (telephoto or wide-angle) It can also be used with algorithms to achieve the effect of optical zoom, thereby improving the imaging effect.

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

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and understandable from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the structural representation of the telephoto lens of the first embodiment of the present invention;

Fig. 2 is the longitudinal aberration diagram (mm) of the telephoto lens in the first embodiment;

Fig. 3 is the field curvature figure (mm) of telephoto lens in the first embodiment;

Fig. 4 is the distortion figure (%) of telephoto lens in the first embodiment;

5 is a schematic structural view of a telephoto lens according to a second embodiment of the present invention;

Fig. 6 is the longitudinal aberration diagram (mm) of telephoto lens in the second embodiment;

Fig. 7 is the field curvature figure (mm) of telephoto lens in the second embodiment;

Fig. 8 is the distortion figure (%) of telephoto lens in the second embodiment;

9 is a schematic structural view of a telephoto lens according to a third embodiment of the present invention;

Fig. 10 is the longitudinal aberration diagram (mm) of the telephoto lens in the third embodiment;

Fig. 11 is the field curvature diagram (mm) of the telephoto lens in the third embodiment;

Fig. 12 is a distortion figure (%) of the telephoto lens in the third embodiment;

13 is a schematic structural diagram of a telephoto lens according to a fourth embodiment of the present invention;

Fig. 14 is the longitudinal aberration diagram (mm) of the telephoto lens in the fourth embodiment;

Fig. 15 is the field curvature diagram (mm) of the telephoto lens in the fourth embodiment;

Fig. 16 is a distortion diagram (%) of the telephoto lens in the fourth embodiment;

17 is a schematic structural diagram of a telephoto camera module according to an embodiment of the present invention;

18 is a schematic structural diagram of an electronic device according to an embodiment of the present invention; and

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

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in different instances, such repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

Please refer to FIG. 1 , FIG. 5 , FIG. 9 and FIG. 13 . The telephoto lens 10 according to the embodiment of the present invention includes a first lens L1 with positive refractive power and a second lens with negative refractive power from the object side to the image side. L2, a third lens L3 with refractive power, and a fourth lens L4 with refractive power.

The first lens L1 has an object side S1 and an image side S2 , and the object side S1 of the first lens L1 is a convex surface. The second lens L2 has an object side S3 and an image side S4 , and both the object side S3 and the image side S4 of the second lens L2 are concave. The third lens L3 has an object side S5 and an image side S6, and the object side S5 of the third lens L3 is a concave surface. The fourth lens L4 has an object side S7 and an image side S8.

The telephoto lens 10 satisfies the following relational expression: TTL/f<0.96; wherein, TTL is the distance between the object side S1 of the first lens L1 and the imaging surface S11 of the telephoto lens 10 (that is, the photosensitive element 20 in FIG. 17 ) on the optical axis The distance above, f is the effective focal length of the telephoto lens 10. That is to say, TTL/f can be any value smaller than 0.96, for example, the value can be 0.1, 0.15, 0.754, 0.825, 0.917, 0.937, 0.941, 0.95, 0.956, 0.958, 0.959 and so on.

When the telephoto lens 10 is used for imaging, the light emitted or reflected by the object OBJ enters the telephoto lens 10 from the object side, and passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L The lens L4 and the infrared filter L5 having the object side S9 and the image side S10 finally converge on the imaging surface S11.

The telephoto lens 10 in the embodiment of the present invention has a shorter TTL through a reasonable TTL configuration, thereby shortening the length of the lens barrel of the telephoto lens 10 .

In some embodiments, the telephoto lens 10 further includes a stop STO. The stop STO may be an aperture stop or a field stop. The embodiments of the present invention are described by taking the diaphragm STO as an example of an aperture diaphragm. The stop STO can be set on the surface of any lens, or before the first lens L1, or between any two lenses, or between the fourth lens L4 and the infrared filter L5. For example, in the first embodiment, the second embodiment and the fourth embodiment, as shown in Fig. 1, Fig. 5 and Fig. 13, the diaphragm STO is arranged between the first lens L1 and the second lens L2; In the third embodiment, as shown in FIG. 9 , the stop STO is disposed between the second lens L2 and the third lens L3 .

In some implementations, the telephoto lens 10 satisfies the following relationship: f1/f<0.51; wherein, f1 is the focal length of the first lens L1. That is to say, f1/f can be any value smaller than 0.51, for example, the value can be -100, -50, -40, -30, 0.44, 0.457, 0.5, 0.504, 0.505, 0.508 and so on.

When the above relational expression is satisfied, the first lens L1 has an appropriate focal length, which is conducive to achieving a balance between expanding the field of view of the telephoto lens 10 and shortening the total optical length of the telephoto lens 10, and has a larger depth of field and is easier to align focus.

In some embodiments, the telephoto lens 10 satisfies the following relationship: SD/TTL<0.75; wherein, SD is the distance on the optical axis from the object side S1 of the first lens L1 to the image side S8 of the fourth lens L4. That is to say, SD/TTL can be any value smaller than 0.75, for example, the value can be 0.1, 0.152, 0.2, 0.242, 0.265, 0.659, 0.65, 0.7, 0.717, 0.74 and so on.

When the above relational expression is satisfied, the length of the device (lens barrel) for fixing all the lenses can be shortened, which is beneficial to production and improves yield.

In some embodiments, the telephoto lens 10 satisfies the following relationship: OA/IMA<0.4; wherein, OA is the maximum effective diameter of the lenses in the first lens L1 to the fourth lens L4 (that is, the first lens L1 to the fourth lens L4 The effective diameter of the lens with the largest effective diameter among the four lenses L4 is the maximum effective diameter), and IMA is the diagonal length of the photosensitive element 20 shown in FIG. 17 on the imaging surface S11 (ie, the photosensitive element 20 in FIG. 17 ). That is to say, OA/IMA can be any value smaller than 0.4, for example, the value can be 0.112, 0.155, 0.212, 0.243, 0.265, 0.285, 0.34, 0.343, 0.355, 0.365, 0.386, 0.392 and so on.

When the above relational expression is satisfied, it is beneficial to miniaturization of the telephoto lens 10 and satisfies the requirement of high pixel.

In some embodiments, the telephoto lens 10 satisfies the following relationship: -5<R4/R5<0; wherein, R4 is the radius of curvature of the image side S4 of the second lens L2, and R5 is the object side of the third lens L3 The radius of curvature of S5. That is to say, R4/R5 can be any value between (-5, 0), for example, the value can be -4.81, -4.58, -4, -3.52, -3, -0.6, -0.4, -0.221, -0.105, -0.081, -0.018, -0.01, etc.

When the above relationship is satisfied, the shapes of the second lens L2 and the third lens L3 can be matched well, which is not only beneficial to the processing and manufacturing of the second lens L2 and the third lens L3 and the assembly of the telephoto lens 10, but also improves the product yield. , it is also beneficial to correct aberrations.

In some embodiments, the telephoto lens 10 satisfies the following relationship: 0.2<SL/TTL<0.9; wherein, SL is the distance from the diaphragm STO to the imaging surface S11 (that is, the photosensitive element 20 in FIG. 17 ) on the optical axis. distance.

That is to say, SL/TTL can be any value between (0.2, 0.9), for example, the value can be 0.25, 0.28, 0.82, 0.84, 0.85, 0.89 and so on.

When the above relational expression is satisfied, the exit pupil of the telephoto lens 10 can be kept away from the imaging surface S11, so the light will be incident on the photosensitive element 20 shown in FIG. , so that the photosensitivity of the photosensitive element 20 shown in FIG. 17 is improved, and the possibility of vignetting in the telephoto lens 10 is reduced.

In some implementations, the telephoto lens 10 satisfies the following relationship: 0.5<CT1/D<1; wherein, CT1 is the central thickness of the first lens L1, and D is the Y radius of the first lens L1. That is to say, CT1/D can be any value between (0.5, 1), for example, the value can be 0.51, 0.55, 0.6, 0.65, 0.82, 0.85, 0.89, 0.9, 0.95, 0.98 and so on.

When the above relationship is satisfied, the first lens L1 has a relatively suitable size, which is beneficial to improving the imaging quality of the telephoto lens 10 and shortening the height of the telephoto lens 10 , and can also reduce molding difficulty, improve yield, and reduce costs.

In some embodiments, the first lens L1 to the fourth lens L4 are plastic lenses or glass lenses, and the telephoto lens 10 satisfies the following relationship: 0≤N≤4; where N is the first lens L1 to the fourth lens The number of glass lenses used in L4. That is to say, N can be any integer between [0,4], for example, the value can be 0, 1, 2, 3, 4. For example, in the first embodiment, the first lens L1 to the fourth lens L4 are all plastic lenses; in the second embodiment, the first lens L1 and the second lens L2 are glass lenses, and the third lens L3 and the fourth lens The lens L4 is a plastic lens; in the third embodiment and the fourth embodiment, the first lens L1 and the third lens L3 are glass lenses, and the second lens L2 and the fourth lens L4 are plastic lenses.

In this way, the telephoto lens 10 can achieve ultra-thinness while correcting aberrations and solving temperature drift problems through a reasonable configuration of lens materials, and the cost is low. In addition, four lenses are used, and the weight is relatively light, and the production cost can be reduced and satisfactory optical performance can be achieved through reasonable focal power collocation.

In some embodiments, at least one surface of at least one lens in the telephoto lens 10 is aspherical. For example, in the first embodiment, the object side and the image side of the first lens L1, the third lens L3, and the fourth lens L4 are all aspherical surfaces.

In some embodiments, the first lens L1 , the second lens L2 , the third lens L3 , and the fourth lens L4 are all aspheric mirrors. The surface shape of an aspheric surface is determined by the following formula: Among them, Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the vertex (the reciprocal of the radius of curvature), k is the conic constant, and Ai is the i-th order of the aspheric surface Correction factor.

In this way, the telephoto lens 10 can effectively shorten the total length of the telephoto lens 10 by adjusting the curvature radius and aspheric coefficient of each lens surface, and can effectively correct aberrations and improve imaging quality.

First embodiment:

1 to 4, the infrared lens 10 of the first embodiment includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and an infrared filter L5 from the object side to the image side. .

The first lens L1 has positive refractive power and is made of plastic. The object side S1 is convex, and the image side S2 is convex at the optical axis and flat at the circumference, both of which are aspherical. The second lens L2 has negative refractive power and is made of plastic. The object side S3 is concave at the optical axis and flat at the circumference, the image side S4 is concave, the object side S3 is spherical, and the image side S4 is aspherical. The third lens L3 has positive refractive power and is made of plastic. The object side S5 is concave, and the image side S6 is convex, both of which are aspherical. The fourth lens L4 has a negative refractive power and is made of plastic. The object side S7 is concave, and the image side S8 is convex, both of which are aspherical.

The stop STO is disposed between the first lens L1 and the second lens L2. The aperture number of the infrared lens 10 is FNO=2.6.

The infrared filter L5 is made of glass, and is disposed between the fourth lens L4 and the imaging surface S11 without affecting the focal length of the infrared lens 10 .

In the first embodiment, the effective focal length of the infrared lens 10 is f=9.6, the aperture number of the infrared lens 10 is FNO=2.6, and the field of view of the infrared lens 10 is FOV=31 degrees. The infrared lens 10 satisfies the following conditions: TTL/f=0.958; f1/f=0.457; SD/TTL=0.597; OA/IMA=0.343; R4/R5=-0.81; SL/TTL=0.81; CT1/D=0.9.

The telephoto lens 10 satisfies the conditions of the following table:

Table 1

Table 2

second embodiment

5 to 8, the infrared lens 10 of the second embodiment includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and an infrared filter L5 from the object side to the image side. .

The first lens L1 has a positive refractive power and is made of glass. The object side S1 is convex, and the image side S2 is convex, both of which are aspherical. The second lens L2 has negative refractive power and is made of glass. The object side S3 is concave at the optical axis and flat at the circumference, the image side S4 is concave, the object side S3 is spherical, and the image side S4 is aspherical. The third lens L3 has positive refractive power and is made of plastic. The object side S5 is concave, and the image side S6 is convex, both of which are aspherical. The fourth lens L4 has negative refractive power and is made of plastic. The object side S7 is concave, and the image side S8 is concave at the optical axis and convex at the circumference, all of which are aspherical.

The stop STO is disposed between the first lens L1 and the second lens L2. The aperture number of the infrared lens 10 is FNO=2.6.

The infrared filter L5 is made of glass, and is disposed between the fourth lens L4 and the imaging surface S11 without affecting the focal length of the infrared lens 10 .

The telephoto lens 10 satisfies the conditions of the following table:

table 3

Table 4

According to Table 3 and Table 4, the following data can be obtained:

f(mm) 9.8 SD/TTL 0.717 FNO 2.6 OA/IMA 0.343 FOV (degrees) 30.6 R4/R5 -1.07 TTL/f 0.937 SL/TTL 0.84 f1/f 0.416 CT1/D 0.76

third embodiment

9 to 12, the infrared lens 10 of the third embodiment includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and an infrared filter L5 from the object side to the image side. .

The first lens L1 has a positive refractive power and is made of glass. The object side S1 is convex, and the image side S2 is convex, both of which are aspherical. The second lens L2 has a negative refractive power and is made of plastic. The object side S3 is concave, the image side S4 is concave at the optical axis and flat at the circumference, the object side S3 is spherical, and the image side S4 is aspherical. The third lens L3 has negative refractive power and is made of glass. The object side S5 is concave, and the image side S6 is concave at the optical axis and convex at the circumference, all of which are aspherical. The fourth lens L4 has positive refractive power and is made of plastic. The object side S7 is concave, and the image side S8 is convex, both of which are aspherical.

The stop STO is disposed between the second lens L2 and the third lens L3. The aperture number of the infrared lens 10 is FNO=2.6.

The infrared filter L5 is made of glass, and is disposed between the fourth lens L4 and the imaging surface S11 without affecting the focal length of the infrared lens 10 .

The telephoto lens 10 satisfies the conditions of the following table:

table 5

Table 6

According to Table 5 and Table 6, the following data can be drawn:

f(mm) 9.77 SD/TTL 0.659 FNO 2.6 OA/IMA 0.343 FOV (degrees) 30.6 R4/R5 -4.81 TTL/f 0.941 SL/TTL 0.296 f1/f 0.421 CT1/D 0.74

Fourth embodiment

13 to 16, the infrared lens 10 of the fourth embodiment includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and an infrared filter L5 from the object side to the image side. .

The first lens L1 has a positive refractive power and is made of glass. The object side S1 is convex, and the image side S2 is concave at the optical axis and flat at the circumference, all of which are aspherical. The second lens L2 has negative refractive power and is made of plastic. The object side S3 is concave, and the image side S4 is concave, both of which are aspherical. The third lens L3 has positive refractive power and is made of glass. The object side S5 is concave at the optical axis and convex at the circumference. The image side S6 is convex and aspherical. The fourth lens L4 has a negative refractive power and is made of plastic. The object side S7 is concave, and the image side S8 is convex, both of which are aspherical.

The stop STO is disposed between the first lens L1 and the second lens L2. The aperture number of the infrared lens 10 is FNO=2.6.

The infrared filter L5 is made of glass, and is disposed between the fourth lens L4 and the imaging surface S11 without affecting the focal length of the infrared lens 10 .

The telephoto lens 10 satisfies the conditions of the following table:

Table 7

Table 8

According to Table 7 and Table 8, the following data can be obtained:

f(mm) 9.6 SD/TTL 0.643 FNO 2.6 OA/IMA 0.343 FOV (degrees) 31 R4/R5 -0.018 TTL/f 0.956 SL/TTL 0.8 f1/f 0.504 CT1/D 0.82

Referring to FIG. 17 , a telephoto camera module 100 according to an embodiment of the present invention includes a photosensitive element 20 and a telephoto lens 10 according to any of the above-mentioned embodiments. The photosensitive element 20 is provided on the image side of the telephoto lens 10 .

The photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) photosensitive element or a charge-coupled device (CCD, Charge-coupled Device) photosensitive element.

Please refer to FIG. 18 and FIG. 19 . An electronic device 1000 according to an embodiment of the present invention includes a housing 400 and the telephoto camera module 100 according to the above embodiment. The telephoto camera module 100 is installed on the casing 400 . The housing 400 can protect the telephoto camera module.

In some embodiments, the electronic device 1000 further includes a wide-angle camera module 200, and the wide-angle camera module 200 is installed on the housing 400. The electronic device 100 can acquire telephoto images through the telephoto camera module Group 200 acquires wide angle images.

In this way, the electronic device 1000 can be used in conjunction with the wide-angle camera module 200 with a short system effective focal length and a wider viewing angle installed on the casing 400. When capturing an image, the electronic device will allow the user to select between different camera functions (telephoto or wide-angle), and can also be used with algorithms to achieve the effect of optical zoom, thereby improving the imaging effect.

The electronic device 1000 in the embodiment of the present invention includes, but is not limited to, a smart phone (as shown in FIG. 18 ), a mobile phone, a personal digital assistant (Personal Digital Assistant, PDA), a game machine, a personal computer (personal computer, PC), a camera, Smart watches, tablet computers (shown in Figure 19) and other information terminal equipment or home appliances with camera functions.

In the description of this specification, reference is made to the terms "certain embodiments," "one embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples," etc. The description means that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of said features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Although the embodiment of the present invention has been shown and described above, it can be understood that the above embodiment is exemplary and should not be construed as a limitation of the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations, the scope of the present invention is defined by the claims and their equivalents.

Claims (12)

1. a telephoto lens, is characterized in that, described telephoto lens comprises successively from object side to image side: A first lens with positive refractive power, the object side of the first lens is convex; A second lens with negative refractive power, the object side and image side of the second lens are both concave; a third lens with refractive power, the object side of the third lens is concave; and A fourth lens with refractive power; The telephoto lens satisfies the following relationship: TTL/f<0.96; Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the telephoto lens, and f is the effective focal length of the telephoto lens. 2. telephoto lens according to claim 1, is characterized in that, described telephoto lens satisfies the following relational expression: f1/f<0.51; Wherein, f1 is the focal length of the first lens. 3. telephoto lens according to claim 1, is characterized in that, described telephoto lens satisfies the following relational expression: SD/TTL<0.75; Wherein, SD is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens. 4. The telephoto lens according to claim 1, wherein the telephoto lens satisfies the following relational expression: OA/IMA<0.4; Wherein, OA is the maximum effective diameter of the lenses among the first lens to the fourth lens, and IMA is the diagonal length of the photosensitive element on the imaging plane. 5. The telephoto lens according to claim 1, wherein the telephoto lens satisfies the following relational expression: -5<R4/R5<0; Wherein, R4 is the radius of curvature of the image side of the second lens, and R5 is the radius of curvature of the object side of the third lens. 6. telephoto lens according to claim 1, is characterized in that, described telephoto lens also comprises diaphragm, and described telephoto lens satisfies the following relational expression: 0.2<SL/TTL<0.9; Wherein, SL is the distance on the optical axis from the diaphragm to the imaging surface. 7. The telephoto lens according to claim 1, wherein the telephoto lens satisfies the following relational expression: 0.5<CT1/D<1; Wherein, CT1 is the central thickness of the first lens, and D is the Y radius of the first lens. 8. The telephoto lens according to claim 1, wherein the first lens to the fourth lens are plastic lenses or glass lenses, and the telephoto lens satisfies the following relational expression: 0≤N≤4; Wherein, N is the number of glass lenses used in the first lens to the fourth lens. 9. The telephoto lens according to claim 1, wherein at least one surface of the first lens to the fourth lens is aspheric. 10. A telephoto camera module, characterized in that the telephoto camera module comprises: The telephoto lens described in any one of claims 1 to 9; and A photosensitive element, the photosensitive element is arranged on the image side of the telephoto lens. 11. An electronic device, characterized in that the electronic device comprises: shell; and The telephoto camera module according to claim 10, the telephoto camera module is mounted on the casing. 12. The electronic device according to claim 11, further comprising a wide-angle camera module, the wide-angle camera is mounted on the housing, and the electronic device can pass through the telephoto camera The module acquires telephoto images and wide-angle images through the wide-angle camera module.