CN117572602A - Optical imaging system and electronic apparatus - Google Patents

Abstract

An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are disposed in order from an object side to an imaging side. In an optical imaging system, one lens has positive refractive power. For example, in an optical imaging system, the third lens has positive refractive power. The optical imaging system satisfies the following conditional expression: TTL/(2×img HT) <0.66 and 0.5mm < smt3456<1.50mm. In the conditional expression, TTL is a distance from the object side surface to the image side surface of the first lens, IMG HT is a height of the image side surface, and SmT3456 is a sum of thicknesses of the third lens to the sixth lens. An electronic device including the optical imaging system is also provided.

Description

Optical imaging system and electronic apparatus

Cross Reference to Related Applications

The present application claims the benefit of priority from korean patent application No. 10-2022-0183472 filed at the korean intellectual property agency on day 12 and 23 of 2022, the entire disclosure of which is incorporated herein by reference for all purposes.

Technical Field

The following description relates to optical imaging systems.

Background

The portable electronic device may include a camera module that captures images or records video. For example, the camera module may be mounted on a device such as, but not limited to, a mobile phone, a laptop computer, or a gaming machine.

The resolution of the camera module may be affected by the optical characteristics of the optical imaging system and the illuminance of the imaging location. For example, in brightly illuminated locations or areas, high resolution imaging is possible. However, high resolution imaging may be difficult in dark illuminated locations or areas. Therefore, it may be beneficial to implement an optical imaging system having a low f-number to enable high resolution imaging even in dark locations or areas.

The above information is presented merely as background information to aid in the understanding of the present disclosure. No determination is made, nor an assertion is made, as to whether any of the above may be used as prior art with respect to the present disclosure.

Disclosure of Invention

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In a general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, wherein the third lens has a positive refractive power, wherein the first lens to the tenth lens are disposed in order from an object side to an imaging side, and wherein TTL/(2×img HT) <0.66 and 0.5mm < smt3456<1.50mm, wherein TTL is a distance from an object side surface to an image side of the first lens, IMG HT is a height of the image side, and SmT3456 is a sum of thicknesses of the third lens to the sixth lens.

The optical imaging system may satisfy the conditional expression 0< f1/f <1.40, where f is a focal length of the optical imaging system, and f1 is a focal length of the first lens.

The optical imaging system may satisfy the conditional expression-10 < f2/f < -1.0, where f is a focal length of the optical imaging system, and f2 is a focal length of the second lens.

The optical imaging system may satisfy the conditional expression 1.0< |f3/f| <35, where f is a focal length of the optical imaging system, and f3 is a focal length of the third lens.

The optical imaging system may satisfy the conditional expression 3.0< |f5/f| <20, where f is a focal length of the optical imaging system, and f5 is a focal length of the fifth lens.

The optical imaging system may satisfy the conditional expression-10 < f6/f < -1.0, where f is a focal length of the optical imaging system, and f6 is a focal length of the sixth lens.

The optical imaging system may satisfy the conditional expression 2.0< f7/f <15, where f is a focal length of the optical imaging system, and f7 is a focal length of the seventh lens.

The optical imaging system may satisfy the conditional expression 0< f9/f <2.0, where f is a focal length of the optical imaging system, and f9 is a focal length of the ninth lens.

The optical imaging system may satisfy the conditional expression-1.0 < f10/f <0, where f is a focal length of the optical imaging system, and f10 is a focal length of the tenth lens.

The electronic device may include an optical imaging system.

In a general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, wherein the third lens has a positive refractive power, wherein the first lens to the tenth lens are disposed in order from an object side to an imaging side, and wherein 0.9< f2/f6<1.20, wherein f2 is a focal length of the second lens, and f6 is a focal length of the sixth lens.

The optical imaging system may satisfy the conditional expression 0.6< f1/f9<1.0, where f1 is the focal length of the first lens and f9 is the focal length of the ninth lens.

The optical imaging system may satisfy the conditional expression 0.9< f5/f7<1.50, where f5 is the focal length of the fifth lens, and f7 is the focal length of the seventh lens.

The optical imaging system may satisfy the conditional expression-2.0 < f9/f10< -1.20, where f9 is the focal length of the ninth lens and f10 is the focal length of the tenth lens.

The optical imaging system may satisfy the conditional expression-3.0 < (f1+f7)/(f2+f6) < -0.8, where f1 is the focal length of the first lens and f7 is the focal length of the seventh lens.

The optical imaging system may satisfy the conditional expression 1.5< f3/R5-f3/R6<2.0, where f3 is a focal length of the third lens, R5 is a radius of curvature of an object side of the third lens, and R6 is a radius of curvature of an image side of the third lens.

The optical imaging system may satisfy the conditional expression 0.50< |r20/f10| <0.60, where f10 is a focal length of the tenth lens, and R20 is a radius of curvature of an image side surface of the tenth lens.

The electronic device may include an optical imaging system.

In a general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, wherein the fourth lens has a negative refractive power, wherein the eighth lens has a positive refractive power, wherein the first lens to the tenth lens are disposed in order from an object side to an imaging side, and wherein TTL/(2×img HT) <0.66, wherein TTL is a distance from an object side surface to an image side surface of the first lens, and IMG HT is a height of the image side.

Other features and examples will become apparent from the following detailed description, the accompanying drawings, and the appended claims.

Drawings

Fig. 1 is a configuration diagram showing an exemplary optical imaging system according to the first exemplary embodiment.

Fig. 2 is an aberration curve of the exemplary optical imaging system shown in fig. 1.

Fig. 3 is a configuration diagram showing an exemplary optical imaging system according to a second exemplary embodiment.

Fig. 4 is an aberration curve of the exemplary optical imaging system shown in fig. 3.

Fig. 5 is a configuration diagram showing an exemplary optical imaging system according to the third exemplary embodiment.

Fig. 6 is an aberration curve of the exemplary optical imaging system shown in fig. 5.

Fig. 7 is a configuration diagram showing an exemplary optical imaging system according to the fourth exemplary embodiment.

Fig. 8 is an aberration curve of the exemplary optical imaging system shown in fig. 7.

Fig. 9 is a configuration diagram showing an exemplary optical imaging system according to the fifth exemplary embodiment.

Fig. 10 is an aberration curve of the exemplary optical imaging system shown in fig. 9.

Fig. 11 is a configuration diagram showing an exemplary optical imaging system according to the sixth exemplary embodiment.

Fig. 12 is an aberration curve of the exemplary optical imaging system shown in fig. 11.

Fig. 13 is a configuration diagram showing an exemplary optical imaging system according to the seventh exemplary embodiment.

Fig. 14 is an aberration curve of the exemplary optical imaging system shown in fig. 13.

Fig. 15 is a configuration diagram showing an exemplary optical imaging system according to the eighth exemplary embodiment.

Fig. 16 is an aberration curve of the exemplary optical imaging system shown in fig. 15.

FIG. 17 illustrates a perspective view of an exemplary electronic device including an exemplary optical imaging system in accordance with one or more embodiments.

Throughout the drawings and detailed description, the same reference numerals will be understood to refer to the same or similar elements, features and structures unless otherwise described or provided. The figures may not be drawn to scale and the relative sizes, proportions, and depictions of elements in the figures may be exaggerated for clarity, illustration, and convenience.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various alterations, modifications and equivalents of the methods, devices and/or systems described herein will be apparent upon an understanding of the disclosure of the present application. For example, the order in which operations are described herein and/or the order in which operations are described herein is merely an example, and is not limited to the order set forth herein, except in which operations must occur in a particular sequence and/or order of operations, but may be varied as will be apparent upon review of the disclosure of the present application. As another example, an order of operations and/or an order of operations may be performed in parallel, except for an order of operations and/or an order of operations that must occur in one sequence (e.g., a particular sequence). In addition, descriptions of features that are known after understanding the present disclosure may be omitted for clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after an understanding of the present disclosure. Herein, the use of the word "may" (e.g., what may be included or implemented with respect to an example or embodiment) means that there is at least one example or embodiment in which such features are included or implemented, and all examples or embodiments are not so limited. The phrase "example" or "embodiment" as used herein has the same meaning, e.g., the phrase "in one example" has the same meaning as "in one embodiment" and "in one or more examples" has the same meaning as "in one or more embodiments".

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The terms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more. As a non-limiting example, the terms "comprises," "comprising," and "having" specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof, or groups thereof. Furthermore, although an embodiment may describe the presence of the stated features, numbers, operations, components, elements, and/or combinations thereof, other embodiments may exist where one or more of the stated features, numbers, operations, components, elements, and/or combinations thereof may not exist.

Throughout the specification, when a component, element, or layer is referred to as being "on," "connected to," "coupled to," or "joined to" another component, element, or layer, it can be directly "on," "connected to," "coupled to," or "joined to" the other component, element, or layer (e.g., in contact with the other component, element, or layer), or one or more other components, elements, layers may reasonably be present between the component, element, or layer and the other component, element, or layer. When a component, element, or layer is referred to as being "directly on," "directly connected to," "directly coupled to," or "directly engaged to" another component, element, or layer, there are no other components, elements, or layers intervening between the component, element, or layer and the other component, element, or layer. Also, expressions such as "between …" and "directly between …" element "adjacent" and "directly adjacent" can be interpreted as described previously.

Although terms such as "first," "second," and "third," or A, B, (a), (b), etc., may be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections are not limited by these terms. Each of these terms is not intended to limit, for example, the importance, sequence, or order of the corresponding member, component, region, layer, or section, but is only used to distinguish the corresponding member, component, region, layer, or section from other members, components, regions, layers, or sections. Thus, a first member, first component, first region, first layer, or first portion referred to in these examples may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples described herein.

As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more. The phrase "at least one of A, B and C," etc. is intended to have a separate meaning, and these phrases "at least one of A, B and C," etc. also include examples (e.g., any combination of one or more of A, B and C) in which one or more of A, B and C may be present, unless the corresponding description and embodiment requires that the list (e.g., "at least one of A, B and C") be interpreted as having a combined meaning.

One or more examples may enable high quality images even in low light environments.

One or more examples may provide an optical imaging system capable of high resolution imaging even in low light environments.

One or more examples may provide high resolution imaging and image capture even in low light environments.

One or more examples may provide an optical imaging system having a wide viewing angle while having a low f-number.

In one or more examples, the first lens refers to the lens closest to the object (or subject), and the tenth lens refers to the lens closest to the image plane (or image sensor). In one or more examples, the units of radius of curvature, thickness, total Track Length (TTL) (distance from object side to image side of the first lens), image height (IMG HT) (height of image side), and focal length of the lens may be expressed in "mm.

The thickness of the lenses, the distance between the lenses, and the TTL may be dimensions calculated based on the optical axis of the optical imaging system. In addition, in the description of lens shapes in one or more examples, a convex one surface means that the paraxial region of the surface is convex and a concave one surface means that the paraxial region of the surface is concave. Therefore, even when one surface of the lens is described as being convex, the edge portion of the lens may be concave. Similarly, even when one surface of the lens is described as being concave, the edge portion of the lens may be convex.

The optical imaging systems described herein may be mounted on portable electronic devices. For example, the optical imaging system may be mounted on a smart phone, a laptop computer, an augmented reality device, a virtual reality device, a portable game machine, and the like, as just examples. However, the range of use and use examples of the optical imaging system described herein are not limited to the above-described electronic apparatus. For example, the optical imaging system can be applied to an electronic device that provides a narrow installation space but requires high-resolution imaging.

The optical imaging system of the first example according to one or more examples may include a plurality of lenses. For example, the optical imaging system according to the first example may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are disposed in order from the object side to the imaging side. The optical imaging system according to the first example may include a lens having positive refractive power. For example, in the optical imaging system according to the first example, the third lens may have positive refractive power. The optical imaging system according to the first example may satisfy a specific conditional expression. For example, the optical imaging system according to the first example may satisfy the following conditional expression: TTL/(2×img HT) <0.66 and 0.5mm < smt3456<1.50mm. In the conditional expression, TTL may be a distance from the object side surface to the image side surface of the first lens, IMG HT may be a height of the image side surface, and SmT3456 may be a sum of thicknesses of the third lens to the sixth lens.

An optical imaging system according to a second example of one or more examples may include a plurality of lenses. For example, the optical imaging system according to the second example may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are disposed in order from the object side to the imaging side. The optical imaging system according to the second example may include a lens having positive refractive power. For example, in the optical imaging system according to the second example, the third lens may have positive refractive power. The optical imaging system according to the second example may satisfy a specific conditional expression. For example, the optical imaging system according to the second example may satisfy the following conditional expression: 0.9< f2/f6<1.20. In the conditional expression, f2 may be a focal length of the second lens, and f6 may be a focal length of the sixth lens.

The optical imaging system according to the third example of the one or more examples may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens disposed in order from the object side to the imaging side, and one or more of the following conditional expressions may be satisfied.

0<f1/f<1.40

25<V1-V2<45

15<V3-V2<45

10<V1-(V6+V6)/2<30

-10<f2/f<-1.0

1.0<|f3/f|<35

3.0<|f5/f|<20

-10<f6/f<-1.0

2.0<f7/f<15

0<f9/f<2.0

-1.0<f10/f<0

TTL/f<1.30

-1.0<f1/f2<0

0.01<f1/f3<1.0

0<BFL/f<0.3

0<D12/f<0.3

TTL/(2×IMG HT)<0.66

70°<FOV×IMG HT/f

0.3mm<SmT23<0.80mm

0.5mm<SmT3456<1.50mm

0<SmT23/TTL<1.20

0.9<f2/f6<1.20

In the above conditional expression, f may be a focal length of the optical imaging system, f1 may be a focal length of the first lens, f2 may be a focal length of the second lens, f3 may be a focal length of the third lens, f5 may be a focal length of the fifth lens, f6 may be a focal length of the sixth lens, f7 may be a focal length of the seventh lens, f9 may be a focal length of the ninth lens, f10 may be a focal length of the tenth lens, V1 may be an abbe number of the first lens, V2 may be an abbe number of the second lens, V3 may be an abbe number of the third lens, V6 may be an abbe number of the sixth lens, V7 may be an abbe number of the seventh lens, TTL may be a distance from an object side of the first lens to an image side, BFL may be a distance from an image side of the tenth lens to an object side of the second lens, D12 may be a distance from an image side of the first lens to an object side of the second lens, IMG may be a height of the image side may be an image side of the third lens, and a thickness may be SmT, and a thickness may be SmT and a thickness may be 5256 may be formed by the third lenses and 5226.

The optical imaging system according to the fourth example may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are disposed in order from the object side to the imaging side, and one or more of the following conditional expressions may be satisfied.

0.6<f1/f9<1.0

0.9<f5/f7<1.50

-2.0<f9/f10<-1.20

-3.0<(f1+f7)/(f2+f6)<-0.8

1.0<R17/R20<1.50

0.50<|R20/f10|<0.60

3.0<f3/R5<8.0

2.0<f3/R6<5.0

1.5<f3/R5-f3/R6<2.0

1.8<f4/R7-f4/R8<1.9

1.20<f6/R11<1.40

-0.30<f6/R12<-0.10

1.4<f6/R11-f6/R12<1.6

In the above conditional expression, f4 may be a focal length of the fourth lens, R5 may be a radius of curvature of an object side surface of the third lens, R6 may be a radius of curvature of an image side surface of the third lens, R7 may be a radius of curvature of an object side surface of the fourth lens, R8 may be a radius of curvature of an image side surface of the fourth lens, R11 may be a radius of curvature of an object side surface of the sixth lens, R12 may be a radius of curvature of an image side surface of the sixth lens, R17 may be a radius of curvature of an object side surface of the ninth lens, and R20 may be a radius of curvature of an image side surface of the tenth lens.

The optical imaging system according to the fifth example may include one or more features (conditional expressions) according to the third example and one or more features (conditional expressions) according to the fourth example, while including features according to the first example.

The optical imaging system according to the sixth example may include one or more features (conditional expressions) according to the third example and one or more features (conditional expressions) according to the fourth example, while including features according to the second example.

The optical imaging system according to the seventh example may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are disposed in order from the object side to the imaging side, and may satisfy one or more conditional expressions according to the third example and one or more conditional expressions according to the fourth example at the same time.

The optical imaging systems according to the first to seventh examples may include one or more lenses having the following features as necessary. As an example, the optical imaging system according to the first example may include one of the first to tenth lenses having the following features. As another example, the optical imaging system according to the second example may include two or more of the first to tenth lenses having the following features. However, the optical imaging system according to the above example may not necessarily include a lens having the following features.

Hereinafter, features of the first to tenth lenses will be described.

The first lens may have optical power. For example, the first lens may have positive refractive power. One surface of the first lens may be convex. For example, the object-side surface of the first lens may be convex. The first lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the first lens may be aspherical surfaces. The first lens may be formed of a material having high light transmittance and excellent processability. For example, the first lens may be formed of a plastic material or a glass material. The first lens may have a predetermined refractive index. As an example, the refractive index of the first lens may be less than 1.6. As a specific example, the refractive index of the first lens may be greater than 1.52 and less than 1.57. The first lens may have a predetermined abbe number. As an example, the abbe number of the first lens may be less than 60. As a specific example, the abbe number of the first lens may be greater than 53 and less than 58.

The second lens may have optical power. For example, the second lens may have a negative refractive power. One surface of the second lens may be convex. For example, the object-side surface of the second lens may be convex. The second lens may have a spherical or aspherical surface. As an example, both surfaces of the second lens may be aspherical surfaces. The second lens may be formed of a material having high light transmittance and excellent processability. For example, the second lens may be formed of a plastic material or a glass material. The second lens may have a predetermined refractive index. As an example, the refractive index of the second lens may be greater than 1.6. As a specific example, the refractive index of the second lens may be greater than 1.65 and less than 1.70. The second lens may have a predetermined abbe number. As an example, the abbe number of the second lens may be less than 30. As a specific example, the abbe number of the second lens may be greater than 16 and less than 24.

The third lens may have a refractive power. For example, the third lens may have positive or negative refractive power. One surface of the third lens may be convex. For example, the object side surface of the third lens may be convex. The third lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the third lens may be aspherical surfaces. The third lens may be formed of a material having high light transmittance and excellent processability. For example, the third lens may be formed of a plastic material or a glass material. The third lens may have a predetermined refractive index. As an example, the refractive index of the third lens may be less than 1.6. As a specific example, the refractive index of the third lens may be greater than 1.52 and less than 1.58. The third lens may have a predetermined abbe number. As an example, the abbe number of the third lens may be less than 60.

The fourth lens may have a refractive power. For example, the fourth lens may have positive or negative refractive power. One surface of the fourth lens may be convex. For example, the object side surface of the fourth lens may be convex. The fourth lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the fourth lens may be aspherical surfaces. The fourth lens may be formed of a material having high light transmittance and excellent processability. For example, the fourth lens may be formed of a plastic material or a glass material. The fourth lens may have a predetermined refractive index. As an example, the refractive index of the fourth lens may be less than 1.6. As a specific example, the refractive index of the fourth lens may be greater than 1.5 and less than 1.6. The fourth lens may have a predetermined abbe number. As an example, the abbe number of the fourth lens may be 50 or more. As a specific example, the abbe number of the fourth lens may be greater than 50 and less than 60.

The fifth lens may have a refractive power. For example, the fifth lens may have positive refractive power. One surface of the fifth lens may be concave. As an example, the object side surface of the fifth lens may be concave. The fifth lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the fifth lens may be aspherical surfaces. The fifth lens may be formed of a material having high light transmittance and excellent processability. For example, the fifth lens may be formed of a plastic material or a glass material. The fifth lens may have a predetermined refractive index. As an example, the refractive index of the fifth lens may be greater than 1.6. As a specific example, the refractive index of the fifth lens may be greater than 1.65 and less than 1.70. The fifth lens may have a predetermined abbe number. As an example, the abbe number of the fifth lens may be less than 30. As a specific example, the abbe number of the fifth lens may be greater than 16 and less than 24.

The sixth lens may have a refractive power. For example, the sixth lens may have a negative refractive power. One surface of the sixth lens may be concave. For example, the object side surface of the sixth lens may be concave. The sixth lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the sixth lens may be aspherical surfaces. The sixth lens may be formed of a material having high light transmittance and excellent processability. For example, the sixth lens may be formed of a plastic material or a glass material. The sixth lens may have a predetermined refractive index. As an example, the refractive index of the sixth lens may be greater than 1.6. As a specific example, the refractive index of the sixth lens may be greater than 1.65 and less than 1.70. The sixth lens may have a predetermined abbe number. For example, the abbe number of the sixth lens may be less than 30. As a specific example, the abbe number of the sixth lens may be greater than 16 and less than 28.

The seventh lens may have optical power. For example, the seventh lens may have positive refractive power. One surface of the seventh lens may be convex. For example, the object side surface of the seventh lens may be convex. The seventh lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the seventh lens may be aspherical surfaces. One or both surfaces of the seventh lens may have a inflection point. For example, the object side and the image side of the seventh lens may have inflection points. The seventh lens may be formed of a material having high light transmittance and excellent processability. For example, the seventh lens may be formed of a plastic material or a glass material. The seventh lens may have a predetermined refractive index. As an example, the refractive index of the seventh lens may be greater than 1.52. As a specific example, the refractive index of the seventh lens may be greater than 1.52 and less than 1.64. The seventh lens may have a predetermined abbe number. As an example, the abbe number of the seventh lens may be less than 60. As a specific example, the abbe number of the seventh lens may be greater than 50 and less than 60.

The eighth lens may have a refractive power. For example, the eighth lens may have positive refractive power or negative refractive power. One surface of the eighth lens may be convex. For example, the object side surface of the eighth lens may be convex. The eighth lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the eighth lens may be aspherical surfaces. One or both surfaces of the eighth lens may have a inflection point. For example, the object side surface and the image side surface of the eighth lens may have inflection points. The eighth lens may be formed of a material having high light transmittance and excellent processability. For example, the eighth lens may be formed of a plastic material or a glass material. The eighth lens may have a predetermined refractive index. As an example, the refractive index of the eighth lens may be less than 1.6. As a specific example, the refractive index of the eighth lens may be greater than 1.54 and less than 1.60. The eighth lens may have a predetermined abbe number. As an example, the abbe number of the eighth lens may be less than 40. As a specific example, the abbe number of the eighth lens may be greater than 20 and less than 40.

The ninth lens may have a refractive power. For example, the ninth lens may have positive refractive power. One surface of the ninth lens may be convex. For example, the object side surface of the ninth lens may be convex. The ninth lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the ninth lens may be aspherical surfaces. In an example, one or both surfaces of the ninth lens may have a inflection point. For example, the object side and image side of the ninth lens may have inflection points. The ninth lens may be formed of a material having high light transmittance and excellent processability. For example, the ninth lens may be formed of a plastic material or a glass material. The ninth lens may have a predetermined refractive index. As an example, the refractive index of the ninth lens may be greater than 1.52. As a specific example, the refractive index of the ninth lens may be greater than 1.50 and less than 1.60. The ninth lens may have a predetermined abbe number. As an example, the abbe number of the ninth lens may be less than 60. As a specific example, the abbe number of the ninth lens may be greater than 50 and less than 60.

The tenth lens may have a refractive power. For example, the tenth lens may have a negative refractive power. One surface of the tenth lens may be concave. For example, the object side surface of the tenth lens may be concave. The tenth lens may have a spherical surface or an aspherical surface. As an example, both surfaces of the tenth lens may be aspherical surfaces. One or both surfaces of the tenth lens may have a inflection point. For example, the object side and the image side of the tenth lens may have inflection points. The tenth lens may be formed of a material having high light transmittance and excellent processability. For example, the tenth lens may be formed of a plastic material or a glass material. The tenth lens may have a predetermined refractive index. As an example, the refractive index of the tenth lens may be greater than 1.52. As a specific example, the refractive index of the tenth lens may be greater than 1.50 and less than 1.60. The tenth lens may have a predetermined abbe number. As an example, the abbe number of the tenth lens may be less than 60. As a specific example, the abbe number of the tenth lens may be greater than 50 and less than 60.

As described above, the first to tenth lenses may have spherical or aspherical surfaces. When the first to tenth lenses have aspherical surfaces, the aspherical surfaces of the respective lenses may be represented by the following equation 1.

Equation 1:

in equation 1, c may be the inverse of the radius of curvature of the corresponding lens, K may be a conic constant, r may be a distance from any point on the aspherical surface to the optical axis, a to H, J and L to P may be aspherical constants, and Z (or SAG) may be a height in the optical axis direction from any point on the aspherical surface to the vertex of the aspherical surface.

The optical imaging system according to the above exemplary embodiment or the above example may further include an aperture and a filter. As an example, the optical imaging system may further comprise an aperture arranged on the object side of the first lens or between the lenses. As another example, the exemplary optical imaging system may further include a filter disposed between the tenth lens and the image plane. The aperture may be configured to adjust an amount of light incident in a direction of the image plane, and the filter may be configured to block light having a specific wavelength. For reference, the filter described herein may be configured to block infrared rays, but light having a wavelength blocked by the filter is not limited to infrared rays.

Specific exemplary embodiments of an exemplary optical imaging system will be described with reference to the accompanying drawings.

First, an optical imaging system according to a first exemplary embodiment will be described with reference to fig. 1.

The exemplary optical imaging system 100 may include a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, and a tenth lens 110.

The first lens 101 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 102 may have a negative refractive power, and may have a convex object side and a concave image side. The third lens 103 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 104 may have a negative refractive power, and may have a convex object side and a concave image side. The fifth lens 105 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 106 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 107 may have positive refractive power, and may have a convex object side surface and a convex image side surface. Further, the object side surface and the image side surface of the seventh lens 107 may have inflection points. The eighth lens 108 may have positive refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of the eighth lens 108 may have inflection points. The ninth lens 109 may have positive refractive power, and may have a convex object side and a concave image side. Further, the object side surface and the image side surface of the ninth lens 109 may have inflection points. The tenth lens 110 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. Further, the object side surface and the image side surface of the tenth lens 110 may have inflection points.

The exemplary optical imaging system 100 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 110 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 1 and 2 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 2 is an aberration curve of the optical imaging system according to the present exemplary embodiment.

TABLE 1

TABLE 2

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An exemplary optical imaging system according to a second exemplary embodiment will be described with reference to fig. 3.

Referring to fig. 3, an exemplary optical imaging system 200 may include a first lens 201, a second lens 202, a third lens 203, a fourth lens 204, a fifth lens 205, a sixth lens 206, a seventh lens 207, an eighth lens 208, a ninth lens 209, and a tenth lens 210.

The first lens 201 may have positive refractive power, and may have a convex object side and a concave image side. The second lens 202 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 203 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 204 may have positive refractive power, and may have a convex object side and a concave image side. The fifth lens 205 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 206 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 207 may have positive refractive power, and may have a convex object side and a convex image side. Further, the object side surface and the image side surface of the seventh lens 207 may have inflection points. Eighth lens 208 may have a negative refractive power and may have a convex object side and a concave image side. In addition, the object-side and image-side surfaces of the eighth lens 208 may have inflection points. The ninth lens 209 may have a positive refractive power, and may have a convex object side and a concave image side. Further, the object side surface and the image side surface of the ninth lens 209 may have inflection points. The tenth lens 210 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. Further, the object side surface and the image side surface of the tenth lens 210 may have inflection points.

The optical imaging system 200 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 210 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 3 and 4 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 4 is an aberration curve of the exemplary optical imaging system according to the present exemplary embodiment.

TABLE 3 Table 3

TABLE 4 Table 4

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An exemplary optical imaging system according to a third exemplary embodiment will be described with reference to fig. 5. Referring to fig. 5, an exemplary optical imaging system 300 may include a first lens 301, a second lens 302, a third lens 303, a fourth lens 304, a fifth lens 305, a sixth lens 306, a seventh lens 307, an eighth lens 308, a ninth lens 309, and a tenth lens 310.

The first lens 301 may have positive refractive power, and may have a convex object side and a concave image side. The second lens 302 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 303 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 304 may have positive refractive power, and may have a convex object side and a concave image side. The fifth lens 305 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 306 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 307 may have a positive refractive power and may have a convex object side and a convex image side. Further, the object side surface and the image side surface of the seventh lens 307 may have inflection points. The eighth lens 308 may have a negative refractive power and may have a convex object side and a concave image side. Further, the object-side and image-side surfaces of the eighth lens 308 may have inflection points. The ninth lens 309 may have positive refractive power, and may have a convex object side and a concave image side. Further, the object side surface and the image side surface of the ninth lens 309 may have inflection points. The tenth lens 310 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. Further, the object side surface and the image side surface of the tenth lens 310 may have inflection points.

The optical imaging system 300 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 310 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 5 and 6 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 6 is an aberration curve of the exemplary optical imaging system according to the present exemplary embodiment.

TABLE 5

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TABLE 6

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An exemplary optical imaging system according to a fourth exemplary embodiment will be described with reference to fig. 7.

Referring to fig. 7, an exemplary optical imaging system 400 may include a first lens 401, a second lens 402, a third lens 403, a fourth lens 404, a fifth lens 405, a sixth lens 406, a seventh lens 407, an eighth lens 408, a ninth lens 409, and a tenth lens 410.

The first lens 401 may have positive refractive power, and may have a convex object side and a concave image side. The second lens 402 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 403 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 404 may have a negative refractive power, and may have a convex object side and a concave image side. The fifth lens 405 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The sixth lens 406 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 407 may have positive refractive power, and may have a convex object side and a convex image side. In addition, the object side surface and the image side surface of the seventh lens 407 may have inflection points. Eighth lens 408 may have positive refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of the eighth lens 408 may have inflection points. The ninth lens 409 may have a positive refractive power and may have a convex object side and a concave image side. Further, the object side and image side of the ninth lens 409 may have inflection points. The tenth lens 410 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. Further, the object side surface and the image side surface of the tenth lens 410 may have inflection points.

The optical imaging system 400 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 410 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 7 and 8 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 8 is an aberration curve of the optical imaging system according to the present exemplary embodiment.

TABLE 7

TABLE 8

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An exemplary optical imaging system according to a fifth exemplary embodiment will be described with reference to fig. 9.

Referring to fig. 9, an exemplary optical imaging system 500 may include a first lens 501, a second lens 502, a third lens 503, a fourth lens 504, a fifth lens 505, a sixth lens 506, a seventh lens 507, an eighth lens 508, a ninth lens 509, and a tenth lens 510.

The first lens 501 may have a positive refractive power and may have a convex object side and a concave image side. The second lens 502 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 503 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 504 may have positive refractive power and may have a convex object side and a concave image side. The fifth lens 505 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 506 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 507 may have a positive refractive power, and may have a convex object side and a convex image side. In addition, the object side and image side of the seventh lens 507 may have inflection points. Eighth lens 508 may have a negative refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of the eighth lens 508 may have inflection points. The ninth lens 509 may have a positive refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of the ninth lens 509 may have inflection points. The tenth lens 510 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. Further, the object side and the image side of the tenth lens 510 may have inflection points.

The optical imaging system 500 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 510 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 9 and 10 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 10 is an aberration curve of the optical imaging system according to the present exemplary embodiment.

TABLE 9

Table 10

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An exemplary optical imaging system according to a sixth exemplary embodiment will be described with reference to fig. 11.

The exemplary optical imaging system 600 may include a first lens 601, a second lens 602, a third lens 603, a fourth lens 604, a fifth lens 605, a sixth lens 606, a seventh lens 607, an eighth lens 608, a ninth lens 609, and a tenth lens 610.

The first lens 601 may have positive refractive power, and may have a convex object side and a concave image side. The second lens 602 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 603 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 604 may have a negative refractive power and may have a convex object side and a concave image side. The fifth lens 605 may have positive refractive power and may have a concave object side and a convex image side. The sixth lens 606 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 607 may have positive refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of the seventh lens 607 may have inflection points. The eighth lens 608 may have positive refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of the eighth lens 608 can have inflection points. The ninth lens 609 may have positive refractive power and may have a convex object side and a concave image side. Further, the object side surface and the image side surface of the ninth lens 609 may have inflection points. The tenth lens 610 may have a negative refractive power and may have a concave object side surface and a concave image side surface. Further, the object side surface and the image side surface of the tenth lens 610 may have inflection points.

The optical imaging system 600 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 610 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 11 and 12 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 12 is an aberration curve of the optical imaging system according to the present exemplary embodiment.

TABLE 11

Table 12

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An exemplary optical imaging system according to a seventh exemplary embodiment will be described with reference to fig. 13.

Exemplary optical imaging system 700 may include a first lens 701, a second lens 702, a third lens 703, a fourth lens 704, a fifth lens 705, a sixth lens 706, a seventh lens 707, an eighth lens 708, a ninth lens 709, and a tenth lens 710.

The first lens 701 may have positive refractive power, and may have a convex object side and a concave image side. The second lens 702 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 703 may have a positive refractive power, and may have a convex object side and a concave image side. The fourth lens 704 may have a negative refractive power and may have a convex object side and a concave image side. The fifth lens 705 may have a positive refractive power and may have a concave object side and a convex image side. The sixth lens 706 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 707 may have positive refractive power and may have a convex object side and a convex image side. Further, the object side surface and the image side surface of the seventh lens 707 may have inflection points. Eighth lens 708 may have a negative refractive power and may have a convex object side and a concave image side. In addition, the object-side and image-side surfaces of eighth lens 708 may have inflection points. The ninth lens 709 may have a positive refractive power and may have a convex object side and a concave image side. Further, the object side and image side of the ninth lens 709 may have inflection points. The tenth lens 710 may have a negative refractive power and may have a concave object side surface and a concave image side surface. Further, the object side and image side of the tenth lens 710 may have inflection points.

The optical imaging system 700 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 710 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 13 and 14 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 14 is an aberration curve of the exemplary optical imaging system according to the present exemplary embodiment.

TABLE 13

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TABLE 14

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An exemplary optical imaging system according to an eighth exemplary embodiment will be described with reference to fig. 15.

Exemplary optical imaging system 800 may include a first lens 801, a second lens 802, a third lens 803, a fourth lens 804, a fifth lens 805, a sixth lens 806, a seventh lens 807, an eighth lens 808, a ninth lens 809, and a tenth lens 810.

The first lens 801 may have positive refractive power and may have a convex object side and a concave image side. The second lens 802 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 803 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 804 may have positive refractive power, and may have a convex object side and a convex image side. The fifth lens 805 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 806 may have negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 807 may have positive refractive power and may have a convex object side and a convex image side. Further, the object side surface and the image side surface of the seventh lens 807 may have inflection points. Eighth lens 808 may have a negative refractive power and may have a convex object side and a concave image side. In addition, the object side and image side of eighth lens 808 may have inflection points. The ninth lens 809 may have positive refractive power and may have a convex object side and a concave image side. Further, the object side surface and the image side surface of the ninth lens 809 may have inflection points. The tenth lens 810 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. Further, the object side and image side of the tenth lens 810 may have inflection points.

The optical imaging system 800 may also include a filter IF and an image plane IP. The filter IF may be disposed between the tenth lens 810 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed on or in one surface of the image sensor IS of the camera module. However, the position of the image plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 15 and 16 below show lens characteristics and aspherical surface values of an exemplary optical imaging system according to the present exemplary embodiment. Fig. 16 is an aberration curve of the exemplary optical imaging system according to the present exemplary embodiment.

TABLE 15

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Table 16

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Tables 17 to 19 below show optical characteristic values and conditional expression values of the exemplary optical imaging systems according to the first to eighth exemplary embodiments.

TABLE 17

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TABLE 18

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TABLE 19

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An exemplary electronic device in accordance with one or more examples will be described with reference to fig. 17.

An example electronic device according to one or more examples may include an optical imaging system according to examples. For example, the electronic device may include one or more optical imaging systems according to the first to eighth exemplary embodiments. As a specific example, the electronic device may include the optical imaging system 100 according to the first exemplary embodiment.

As a non-limiting example, as shown in fig. 17, the electronic device according to the exemplary embodiment may be a portable terminal 1000. However, the form of the electronic device is not limited to the portable terminal 1000. For example, an electronic device according to another exemplary embodiment may be in the form of a laptop computer.

The portable terminal 1000 may include one or more camera modules 10 and 20. For example, the two camera modules 10 and 20 may be installed in the main body 1002 of the portable terminal 1000 at predetermined intervals. The first camera module 10 and the second camera module 20 may be configured to capture images of an object in the same direction. For example, the first camera module 10 and the second camera module 20 may be mounted on one surface of the portable terminal 1000 so as to be parallel to each other.

One or more of the first and second camera modules 10 and 20 may include the optical imaging system according to the first to eighth exemplary embodiments. For example, the second camera module 20 may include the optical imaging system 100 according to the first exemplary embodiment.

While this disclosure includes particular examples, it will be apparent to those skilled in the art after understanding the disclosure of this application that various changes in form and details may be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be construed in an illustrative, and not a restrictive sense. The description of features or aspects in each example should be considered as applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices or circuits are combined in a different manner and/or replaced or supplemented by other components or their equivalents.

Therefore, the scope of the present disclosure may be defined by the claims and their equivalents in addition to the above disclosure, and all modifications within the scope of the claims and their equivalents should be construed as being included in the present disclosure.

Claims (20)

1. An optical imaging system, comprising:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens,

wherein the third lens has a positive refractive power,

wherein the first lens to the tenth lens are disposed in order from an object side to an imaging side,

wherein TTL/(2 xIMG HT) <0.66 and 0.5mm < SmT3456<1.50mm,

wherein TTL is the distance from the object side surface to the image side surface of the first lens, IMG HT is the height of the image side surface, and SmT3456 is the sum of the thicknesses of the third lens and the sixth lens, an

Wherein the optical imaging system has ten lenses in total.

2. The optical imaging system of claim 1, wherein:

0<f1/f<1.40，

where f is the focal length of the optical imaging system and f1 is the focal length of the first lens.

3. The optical imaging system of claim 1, wherein:

-10<f2/f<-1.0，

Where f is the focal length of the optical imaging system and f2 is the focal length of the second lens.

4. The optical imaging system of claim 1, wherein:

1.0<|f3/f|<35，

where f is the focal length of the optical imaging system, and f3 is the focal length of the third lens.

5. The optical imaging system of claim 1, wherein:

3.0<|f5/f|<20，

where f is the focal length of the optical imaging system, and f5 is the focal length of the fifth lens.

6. The optical imaging system of claim 1, wherein:

-10<f6/f<-1.0，

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

7. The optical imaging system of claim 1, wherein:

2.0<f7/f<15，

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

8. The optical imaging system of claim 1, wherein:

0<f9/f<2.0，

where f is the focal length of the optical imaging system, and f9 is the focal length of the ninth lens.

9. The optical imaging system of claim 1, wherein:

-1.0<f10/f<0，

where f is the focal length of the optical imaging system, and f10 is the focal length of the tenth lens.

10. Electronic device comprising an optical imaging system according to any of claims 1 to 9.

11. An optical imaging system, comprising:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens,

wherein the third lens has a positive refractive power,

wherein the first lens to the tenth lens are disposed in order from an object side to an imaging side,

wherein 0.9< f2/f6<1.20,

wherein f2 is the focal length of the second lens, and f6 is the focal length of the sixth lens, an

Wherein the optical imaging system has ten lenses in total.

12. The optical imaging system of claim 11, wherein:

0.6<f1/f9<1.0，

where f1 is the focal length of the first lens and f9 is the focal length of the ninth lens.

13. The optical imaging system of claim 11, wherein:

0.9<f5/f7<1.50，

where f5 is the focal length of the fifth lens and f7 is the focal length of the seventh lens.

14. The optical imaging system of claim 11, wherein:

-2.0<f9/f10<-1.20，

where f9 is the focal length of the ninth lens, and f10 is the focal length of the tenth lens.

15. The optical imaging system of claim 11, wherein:

-3.0<(f1+f7)/(f2+f6)<-0.8，

where f1 is the focal length of the first lens and f7 is the focal length of the seventh lens.

16. The optical imaging system of claim 11, wherein:

1.5<f3/R5-f3/R6<2.0，

where f3 is a focal length of the third lens, R5 is a radius of curvature of an object side surface of the third lens, and R6 is a radius of curvature of an image side surface of the third lens.

17. The optical imaging system of claim 11, wherein:

0.50<|R20/f10|<0.60，

where f10 is the focal length of the tenth lens, and R20 is the radius of curvature of the image side of the tenth lens.

18. Electronic device comprising an optical imaging system according to any of claims 11 to 17.

19. An optical imaging system, comprising:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens,

wherein the fourth lens has a negative refractive power,

wherein the eighth lens has a positive refractive power,

wherein the first lens to the tenth lens are disposed in order from an object side to an imaging side,

wherein TTL/(2 xIMG HT) <0.66,

wherein TTL is the distance from the object side surface to the image side surface of the first lens, and IMG HT is the height of the image side surface, and

wherein the optical imaging system has ten lenses in total.

20. Electronic device comprising an optical imaging system according to claim 19.