CN111221098B

CN111221098B - Telephoto lens, camera module and electronic device

Info

Publication number: CN111221098B
Application number: CN201811413074.2A
Authority: CN
Inventors: 张东赫; 朴成在; 金柄局; 权五镇; 张珍成
Original assignee: Nanchang OFilm Optoelectronics Technology Co Ltd; OFilm Korea Co Ltd
Current assignee: Nanchang OFilm Optoelectronics Technology Co Ltd; OFilm Korea Co Ltd
Priority date: 2018-11-23
Filing date: 2018-11-23
Publication date: 2023-01-13
Anticipated expiration: 2038-11-23
Also published as: CN111221098A; KR20200062042A; KR102415126B1

Abstract

The invention discloses a telephoto lens, a camera module and an electronic device. The telephoto lens according to the embodiment of the present invention includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens having a negative refractive power, a fourth lens, and a fifth lens, where the first lens is a meniscus lens having a convex object-side surface. The fourth lens is a meniscus lens with a convex image side surface. According to the telephoto lens, the camera module and the electronic device, disclosed by the embodiment of the invention, through reasonable lens configuration, the ultra-thinning of the telephoto lens can be realized on the premise of higher imaging quality and lower aperture value, and the miniaturization of the telephoto lens is facilitated.

Description

Telephoto lens, camera module, and electronic device

Technical Field

The present disclosure relates to optical imaging technologies, and particularly to a telephoto lens, a camera module, and an electronic device.

Background

In general, a telephoto lens is generally large in size for high imaging quality and low aperture value, and is difficult to be miniaturized.

Disclosure of Invention

The embodiment of the invention provides a telephoto lens, a camera module and an electronic device.

The telephoto lens according to the embodiment of the present invention includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens having a negative refractive power, a fourth lens, and a fifth lens, where the first lens is a meniscus lens having a convex object-side surface. The fourth lens is a meniscus lens with a convex image side surface.

According to the telephoto lens provided by the embodiment of the invention, through reasonable lens configuration, the telephoto lens not only has higher imaging quality and lower aperture value, but also can be thinned, and the miniaturization of the telephoto lens is facilitated.

In some embodiments, the telephoto lens satisfies the following conditional expression: 0.5< | f1/f | <1.5; wherein f is the focal length of the telephoto lens, and f1 is the focal length of the first lens.

When the telephoto lens meets the conditional expression of 0.5< | f1/f | <1.5, the first lens can provide proper refractive power for the telephoto lens, which is beneficial to reducing the sensitivity of the telephoto lens, optimizing aberration and improving imaging quality.

In some embodiments, the telephoto lens further satisfies the following conditional expression: l R1/R2 l <1.0; wherein R1 is a radius of curvature of an object-side surface of the first lens element, and R2 is a radius of curvature of an image-side surface of the first lens element.

When the telephoto lens meets the conditional expression | R1/R2| <1.0, the first lens has a proper size, which is beneficial to the processing and manufacturing of the first lens and the assembly of the telephoto lens. In addition, the curvature radiuses of the object side surface and the image side surface of the first lens are reasonably distributed, so that the aberration balance of the telephoto lens can be maintained, and the imaging quality of the telephoto lens is improved.

In some embodiments, the telephoto lens further satisfies the following conditional expression: TTL/f <2; wherein f is the focal length of the telephoto lens, and TTL is the distance from the object-side surface of the first lens element to the optical axis of the imaging plane.

When the telephoto lens satisfies the conditional TTL/f <2, the telephoto lens has a shorter TTL, thereby shortening the length of the telephoto lens.

In some embodiments, the telephoto lens further satisfies the following conditional expression: 0.8< -TTL/f <1; wherein f is a focal length of the telephoto lens, and TTL is a distance from an object-side surface of the first lens to an optical axis of an imaging plane.

When the telephoto lens satisfies the conditional expression 0.8-less TTL/f <1, the telephoto lens satisfying the conditional expression 0.8-less TTL/f <1 has a shorter TTL than the telephoto lens satisfying the conditional expression TTL/f <2, and the length of the telephoto lens can be further shortened.

In some embodiments, the telephoto lens further comprises a stop disposed on an object-side surface of the first lens.

The telephoto lens is arranged through a reasonable diaphragm, so that the light entering amount can be better controlled, and the imaging effect is improved.

In some embodiments, the telephoto lens further includes a prism, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens being sequentially disposed along an optical axis, the prism being configured to reflect light such that the light incident to the prism is reflected toward the first lens.

The reflection direction of light rays is changed through the prism, so that the telephoto lens can be laid horizontally (placed backwards relative to vertical placement), a periscopic structure can be realized, and the thickness of a device carrying the telephoto lens is reduced.

In some embodiments, at least one surface of the first lens to the fifth lens is aspheric.

The telephoto lens can effectively reduce the total length of the telephoto lens by adjusting the curvature radius and the aspheric coefficient of the lens surface, and the aberration of the telephoto lens can be effectively corrected by using a plurality of surface types, thereby improving the imaging quality.

The camera module of the embodiment of the invention comprises the telephoto lens and the photosensitive element in any embodiment. The photosensitive element is arranged on the image side of the telephoto lens.

According to the camera module, the telephoto lens has high imaging quality and a low aperture value through reasonable lens configuration, and the ultra-thinning of the telephoto lens can be realized, so that the miniaturization of the telephoto lens is facilitated.

The electronic device of the embodiment of the invention comprises a shell and the camera module of the embodiment. The camera module is mounted on the housing.

According to the electronic device provided by the embodiment of the invention, through reasonable lens configuration, the telephoto lens not only has higher imaging quality and lower aperture value, but also can be thinned, and the miniaturization of the telephoto lens is facilitated. And the shell can play a role in protecting the camera module.

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 view of a telephoto lens with a prism according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a telephoto lens without a prism according to a first embodiment of the present invention;

FIG. 3 is a diagram of the diffraction modulation transfer function of the telephoto lens according to the first embodiment of the present invention

Fig. 4 to 6 are a longitudinal aberration diagram (mm), a field curvature diagram (mm), and a distortion diagram (%), respectively, of the telephoto lens in the first embodiment;

FIG. 7 is a schematic structural diagram of a telephoto lens according to a second embodiment of the present invention;

FIG. 8 is a diagram of the diffraction modulation transfer function of a telephoto lens according to a second embodiment of the present invention

Fig. 9 to 11 are a longitudinal aberration diagram (mm), a field curvature diagram (mm), and a distortion diagram (%), respectively, of the telephoto lens in the second embodiment;

FIG. 12 is a schematic structural diagram of a telephoto lens according to a third embodiment of the present invention;

FIG. 13 is a diagram of the diffraction modulation transfer function of a telephoto lens according to a third embodiment of the present invention

Fig. 14 to 16 are a longitudinal aberration diagram (mm), a field curvature diagram (mm), and a distortion diagram (%), respectively, of the telephoto lens in the third embodiment;

FIG. 17 is a schematic view of a camera module according to an embodiment of the present invention; and

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

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 illustrative only for the purpose of explaining the present invention, and are not to 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 those shown in the drawings, merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to 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 to implicitly indicate 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 defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically, electrically or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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. 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 letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1, fig. 2, fig. 7, and fig. 12, the telephoto lens 10 according to the embodiment of the invention includes, in order from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3 having a negative refractive power, a fourth lens element L4, and a fifth lens element L5.

The first lens element L1 has an object-side surface S1 and an image-side surface S2, and the first lens element L1 is a meniscus lens element with the object-side surface S1 being convex, i.e., the object-side surface S1 is convex and the image-side surface S2 is concave. 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 element L4 has an object-side surface S7 and an image-side surface S8, and the fourth lens element L4 is a meniscus lens element with the image-side surface S8 being convex, i.e., the object-side surface S7 is concave and the image-side surface S8 is convex. The fifth lens L5 has an object-side surface S9 and an image-side surface S10.

The telephoto lens 10 according to the embodiment of the present invention has a reasonable lens configuration, and the telephoto lens 10 not only has high imaging quality and a low aperture value, but also can realize the ultra-thinness of the telephoto lens 10, which is advantageous for the miniaturization of the telephoto lens 10.

In some embodiments, the telephoto lens 10 further satisfies the following conditional expression: 0.5< | f1/f | <1.5; where f is the focal length of the telephoto lens 10, and f1 is the focal length of the first lens L1. That is, | f1/f | may be any numerical value within the interval (0.5, 1.5), for example, the value may be 0.646, 0.679, 0.985, 1.099, 1.356, and so on.

When the telephoto lens 10 satisfies the conditional expression 0.5< | f1/f | <1.5, the first lens L1 may provide a suitable refractive power for the telephoto lens 10, which is beneficial to reducing the sensitivity of the telephoto lens 10, optimizing the aberration, and improving the imaging quality.

In some embodiments, the telephoto lens 10 further satisfies the following conditional expression: R1/R2| <1.0; where R1 is a radius of curvature of the object-side surface S1 of the first lens L1, and R2 is a radius of curvature of the image-side surface S2 of the first lens L1. That is, | R1/R2| may be any numerical value less than 1.0, for example, the value may be 0.286, 0.302, 0.406, 0.602, 0.977, and so on.

When the telephoto lens 10 satisfies the conditional expression | R1/R2| <1.0, the first lens L1 has a suitable size, which is beneficial to the processing and manufacturing of the first lens L1 and the assembly of the telephoto lens 10. In addition, by reasonably distributing the curvature radii of the object side surface S1 and the image side surface S2 of the first lens L1, the aberration balance of the telephoto lens 10 can be maintained, and the imaging quality of the telephoto lens 10 can be improved.

In some embodiments, the telephoto lens 10 further satisfies the following conditional expression: TTL/f <2; where f is the focal length of the telephoto lens system 10, and TTL is the distance between the object-side surface S1 of the first lens element L1 and the image plane S13 on the optical axis. That is, TTL/f can be any value less than 2, for example, the value can be 0.883, 0.926, 1.004, 1.356, 1.586, and so forth.

When the telephoto lens 10 satisfies the conditional TTL/f <2, the telephoto lens 10 has a shorter TTL, thereby shortening the length of the telephoto lens 10.

In some embodiments, the telephoto lens 10 further satisfies the following conditional expression: 0.8< -TTL/f <1; where f is the focal length of the telephoto lens system 10, and TTL is the distance between the object-side surface S1 of the first lens element L1 and the image plane S13 on the optical axis. That is, TTL/f can be any value within the interval (0.8, 1), e.g., the value can be 0.815, 0.856, 0.883, 0.926, 0.978, etc.

When the telephoto lens 10 satisfies the conditional expressions 0.8< -TTL/f <1, the telephoto lens 10 satisfying the conditional expressions 0.8< -TTL/f <1 has a shorter TTL than the telephoto lens 10 satisfying the conditional expressions TTL/f <2, and the length of the telephoto lens 10 can be further shortened.

In some embodiments, telephoto lens 10 further includes filter L6. The filter L6 is disposed between the fifth lens L5 and the image forming surface S13. In the embodiment of the invention, the filter L6 is an infrared filter L6, the infrared filter L6 includes an object side surface S11 and an image side surface S12, and the infrared filter L6 is used for filtering infrared light. When the telephoto lens 10 is used for imaging, light emitted or reflected by a subject enters the telephoto lens 10 from the object side direction, sequentially passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the infrared filter L6, and finally converges on the imaging surface S13. The infrared filter L6 can filter the influence of the infrared light in the ambient light on the imaging, and only allow the visible light to pass through, thereby improving the imaging quality of the visible light.

In some embodiments, the stop STO may be an aperture stop or a field stop. The embodiment of the present invention will be described by taking an example in which the stop STO is an aperture stop. The stop STO may be provided between the subject and the first lens L1, or on the surface of any one of the lenses, or between any two of the lenses, or between the fifth lens L5 and the infrared filter L6. The stop STO of the embodiment of the present invention is disposed on the object side surface S3 of the second lens L2. For example, in the first to third embodiments, the stop STO is disposed on the object-side surface S1 of the first lens L1, so that the light-entering amount can be better controlled and the imaging effect can be improved.

In some embodiments, the telephoto lens 10 includes a prism L7, and the prism L7, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are sequentially disposed along the optical axis, and the prism L7 is configured to reflect light such that the light incident to the prism L7 is reflected toward the first lens L1. For example, the prism L7 may reflect a light ray incident on the prism L7 perpendicular to the optical axis toward the first lens L1 in parallel to the optical axis. Since the prism L7 can change the reflection direction of light, the telephoto lens 10 can be laid down (inverted with respect to the vertical placement), a periscopic structure can be realized, and the thickness of the device on which the telephoto lens 10 is mounted can be reduced.

In some embodiments, the first to fifth lenses L1 to L5 are plastic lenses or glass lenses.

The cost of the plastic lens is low, which is beneficial to reducing the cost of the whole telephoto lens 10; the glass lens is not easy to expand with heat and contract with cold due to the change of the environmental temperature, so that the imaging quality of the telephoto lens 10 is relatively stable.

In some embodiments, at least one surface of the first lens L1 to the fifth lens L5 in the telephoto lens 10 is an aspheric surface. For example, in the first to third embodiments, the object-side and image-side surfaces of the first to fifth lenses L1 to L5 are aspheric. The surface shape of the aspherical surface is determined by the following formula:

wherein Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance between any point on the aspheric surface and the optical axis, c is the vertex curvature (the reciprocal of the curvature radius), k is the conic constant, and Ai is the correction coefficient of the i-th order of the aspheric surface.

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

First embodiment

Referring to fig. 1 to 6, from the object side to the image side, the telephoto lens 10 according to the first embodiment includes a prism L7, a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter L6 along an optical axis in sequence.

The prism L7 is used to change the reflection direction of the light so that the light incident on the prism L7 perpendicular to the optical axis is directed toward the first lens L1 parallel to the optical axis. The prism L7 may be made of glass or high-transmittance plastic.

The first lens element L1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2, and both the object-side surface S1 and the image-side surface S2 are aspheric. The second lens element L2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4, and both the object-side surface S3 and the image-side surface S4 are aspheric. The third lens element L3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6, and both the object-side surface S5 and the image-side surface S6 are aspheric. The fourth lens element L4 with positive refractive power has a concave object-side surface S7 and a convex image-side surface S8, and both the object-side surface S7 and the image-side surface S8 are aspheric. The fifth lens element L5 with negative refractive power has a concave object-side surface S9 and a convex image-side surface S10, and both the object-side surface S9 and the image-side surface S10 are aspheric.

The infrared filter L6 is made of glass, and is disposed between the fifth lens element L5 and the image plane S13 without affecting the focal length of the telephoto lens 10.

The effective focal length of the telephoto lens 10 is f =10.30mm. The f-number FNO of the telephoto lens 10 =2.7. The field angle FOV =26.5 degrees of the telephoto lens 10. The total optical length of the telephoto lens system 10 (i.e., the distance between the object side surface S1 of the first lens element L1 and the image plane S13 on the optical axis) is TTL =9.100mm. The length of the diagonal line of the photosensitive element (shown in fig. 17) is 2y =5.000mm.

The optical back focus of telephoto lens 10 is BFL =2.520mm. The mechanical back focus of the telephoto lens 10 is FFL = -10.249mm. The image height distortion of the telephoto lens 10 is IMG DIS =2.520mm. The maximum imaging height of the image plane S15 in the telephoto lens 10 is HT =2.517mm. The mechanical field angle of the telephoto lens 10 is ANG =13.734 degrees. In the entrance pupil of the telephoto lens 10, the aperture is DIA1=3.815mm, and the thickness is THI1=4.623mm. In the exit pupil of the telephoto lens 10, the aperture is DIA2=2.642mm, and the thickness is THI2= -4.614mm.

The telephoto lens 10 further satisfies the following conditions: i f1/f | =0.679; R1/R2| =0.406; TTL/f =0.883.

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

TABLE 1

TABLE 2

Second embodiment

Referring to fig. 7 to 11, the telephoto lens 100 according to the second embodiment includes, in order from the object side to the image side, a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an ir-filter L6.

The infrared filter L6 is made of glass, and is disposed between the fifth lens element L5 and the image plane S13 without affecting the focal length of the telephoto lens system 10.

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

TABLE 3

TABLE 4

The following data are available from tables 3 and 4:

f(mm)	10.80	\|R1/R2\|	0.302
				fno	2.6	TTL/f	0.926
FOV (degree)	25.5	OAL(mm)	7.052
				2y(mm)	5.000	HT(mm)	2.531
TTL(mm)	10.000	ANG (rotation angle)	13.191
				BFL(mm)	2.948	DIA1(mm)	4.154
FFL(mm)	-14.432	THI1(mm)	0.000
				IMG DIS(mm)	2.948	DIA2(mm)	3.109
\|f1/f\|	0.646	THI2(mm)	-5.134

Third embodiment

Referring to fig. 12 to 16, the telephoto lens 100 according to the second embodiment includes, in order from the object side to the image side, a first lens element L1, a stop STO, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an infrared filter L6.

The first lens element L1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2, and both the object-side surface S1 and the image-side surface S2 are aspheric. The second lens element L2 with positive refractive power has a convex object-side surface S3 and a convex image-side surface S4, and both the object-side surface S3 and the image-side surface S4 are aspheric. The third lens element L3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6, and both the object-side surface S5 and the image-side surface S6 are aspheric. The fourth lens element L4 with positive refractive power has a concave object-side surface S7 and a convex image-side surface S8, and both the object-side surface S7 and the image-side surface S8 are aspheric. The fifth lens element L5 with negative refractive power has a concave object-side surface S9 and a concave image-side surface S10, and both the object-side surface S9 and the image-side surface S10 are aspheric.

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

TABLE 5

TABLE 6

The following data are available from tables 5 and 6:

f(mm)	9.26	\|R1/R2\|	0.602
				fno	2.4	TTL/f	1.004
FOV (degree)	31.0	OAL(mm)	6.671
				2y(mm)	5.240	HT(mm)	2.569
TTL(mm)	9.300	ANG (rotation angle)	15.500
				BFL(mm)	2.629	DIA1(mm)	3.799
FFL(mm)	-12.720	THI1(mm)	0.000
				IMG DIS(mm)	2.629	DIA2(mm)	2.767
\|f1/f\|	1.099	THI2(mm)	-4.115

Referring to fig. 17, a camera module 100 according to an embodiment of the present invention includes the telephoto lens 10 and the light-sensing device 20 according to any of the above embodiments. The light sensing element 20 is disposed on the image side of the telephoto lens 10.

Specifically, the photosensitive element 20 may employ a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor.

The camera module 100 according to the embodiment of the invention not only enables the telephoto lens 10 to have higher imaging quality and lower aperture value, but also enables the telephoto lens 10 to be ultra-thin through reasonable lens configuration, which is beneficial to miniaturization of the telephoto lens 10.

Referring to fig. 17 and 18, the electronic device 1000 includes a housing 200 and the camera module 100 of the above embodiment. The camera module 100 is mounted on the housing 200 to acquire an image.

The electronic device 1000 according to the embodiment of the invention not only enables the telephoto lens 10 to have higher imaging quality and lower aperture value through reasonable lens configuration, but also enables the telephoto lens 10 to be ultra-thin, thereby facilitating miniaturization of the telephoto lens 10. And the housing 200 protects the camera module 100.

The electronic device 100 according to the embodiment of the present invention includes, but is not limited to, information terminal devices such as a smart phone, a mobile phone, a Personal Digital Assistant (PDA), a game machine, a Personal Computer (PC), a camera, a smart watch, a tablet PC, and home appliances having a photographing function.

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

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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature described. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims

1. A telephoto lens, which comprises the following components in order from an object side to an image side along an optical axis:

a first lens, the first lens being a meniscus lens with a convex object-side surface;

a second lens element with positive refractive power;

a third lens having a negative refractive power;

a fourth lens element having a meniscus shape with a convex image-side surface; and

a fifth lens element with negative refractive power;

the telephoto lens satisfies the following conditional expression:

0.8<TTL/f<1；

wherein f is the focal length of the telephoto lens, and TTL is the distance from the object-side surface of the first lens element to the optical axis of the imaging plane.

2. The telephoto lens according to claim 1, wherein the telephoto lens satisfies the following conditional expression:

0.5<|f1/f|<1.5；

wherein f is the focal length of the telephoto lens, and f1 is the focal length of the first lens.

3. The telephoto lens according to claim 1, wherein the telephoto lens satisfies the following conditional expression:

|R1/R2|<1.0；

wherein R1 is a radius of curvature of an object-side surface of the first lens element, and R2 is a radius of curvature of an image-side surface of the first lens element.

4. The telephoto lens according to claim 1, wherein the telephoto lens satisfies the following conditional expression:

TTL/f<2；

5. The telephoto lens according to claim 1, further comprising a stop disposed on an object-side surface of the first lens.

6. The telephoto lens according to claim 1, further comprising a prism, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens being sequentially disposed along an optical axis, the prism being configured to reflect light such that the light incident on the prism is reflected toward the first lens.

7. The telephoto lens according to claim 1, wherein at least one surface of the first lens to the fifth lens is an aspheric surface.

8. A camera module, comprising:

the telephoto lens of any one of claims 1-7; and

a light sensing element disposed on an image side of the telephoto lens.

9. An electronic device, comprising:

a housing; and

the camera module of claim 8, mounted on the housing.