CN117572603A - 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, and a sixth lens disposed in order from an object side to an imaging side. In the optical imaging system, the first lens has positive refractive power and has a concave object side, the fourth lens has negative refractive power, and the fifth lens has a convex image side. In addition, the optical imaging system satisfies the following conditional expression: f-number <1.90 and 1.90< TTL/f <2.2. In the conditional expression, TTL is a distance from the object side surface to the image side surface of the first lens, and f is a focal length of the optical imaging system. An electronic device comprising 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. 10-2022-0186854 filed at the korean intellectual property office on 12 months of 2022, the entire disclosure of which is incorporated herein by reference for all purposes.

Technical Field

The following description relates to an optical imaging system.

Background

The augmented reality implementing device may include an optical element that identifies the user's eye. For example, augmented Reality (AR) glasses include a camera module configured to identify a user's iris. The camera module for AR glasses should accurately recognize the position of the user's iris and exhibit constant optical performance even in the case of a change in ambient temperature, and thus an optical imaging system having high resolution and non-deteriorated performance may be desired.

The above information is presented merely as background information to aid in the understanding of the present disclosure. No determination is made as to whether any of the above may be applied as prior art with respect to the present disclosure, and no assertion is made.

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 having positive refractive power and having a concave object side surface; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a negative refractive power; a fifth lens having a convex image-side surface; and a sixth lens having a refractive power, wherein the first lens to the sixth lens are disposed in order from the object side to the imaging side, and wherein f-number <1.90 and 1.90< TTL/f <2.2, wherein TTL is a distance from the object side to the image side of the first lens, and f is a focal length of the optical imaging system.

The optical imaging system may satisfy the conditional expression 0< f1/f <20, where f1 is a focal length of the first lens.

The optical imaging system may satisfy the conditional expression-100 < f2/f <100, where f2 is the focal length of the second lens.

The optical imaging system may satisfy the conditional expression-30 < V1-V2<40, where V1 is the abbe number of the first lens and V2 is the abbe number of the second lens.

The optical imaging system may satisfy the conditional expression 0.09< D12/f <0.10, where D12 is a distance from the image side of the first lens to the object side of the second lens.

The optical imaging system may satisfy the conditional expression 0.09< D23/f <0.10, where D23 is a distance from the image side of the second lens to the object side of the third lens.

The optical imaging system may satisfy the conditional expression 0.20< BFL/TLx <3.0, where BFL is the distance from the image side of the sixth lens to the image plane, and TLx is the distance from the point on the object side of the first lens closest to the object to the image plane.

The electronic device may include an optical imaging system.

In a general aspect, an optical imaging system includes: a first lens having a concave object side surface; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a concave object side surface; a fifth lens having a refractive power; and a sixth lens having a refractive power, wherein the first lens to the sixth lens are disposed in order from the object side to the imaging side, and wherein-1.0 < f3/f4< -0.8 and 1.90< TTL/f <2.20, wherein TTL is a distance from the object side to the image side of the first lens, f is a focal length of the optical imaging system, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.

In an optical imaging system, the f-number may be less than 1.90.

The optical imaging system may satisfy the conditional expression 1.64< ttl/IMG HT <1.86, where IMG HT is the height of the image plane.

The optical imaging system may satisfy the conditional expression 0.70< f3/IMG HT <1.0, where IMG HT is the height of the image plane.

The optical imaging system may satisfy the conditional expression-1.1 < f3/f6<0.80, where f6 is the focal length of the sixth lens.

The optical imaging system may satisfy the conditional expression 0.90< f4/f6<1.20, where f6 is a focal length of the sixth lens.

The optical imaging system may satisfy the conditional expression-0.80 < (r11+r12)/f6 < -0.60, where R11 is a radius of curvature of an object side surface of the sixth lens, R12 is a radius of curvature of an image side surface of the sixth lens, and f6 is a focal length of the sixth lens.

The optical imaging system may satisfy the conditional expression 14< DTn1/DTn2<15, where DTn1 is a temperature coefficient of refractive index of the first lens according to temperature change, and DTn2 is a temperature coefficient of refractive index of the second lens according to temperature change.

The optical imaging system may satisfy the conditional expression of 1.50< (dtn1+dtn3)/(dtn2+dtn4) <1.70, wherein DTn1 is a temperature coefficient of refractive index of the first lens according to temperature change, DTn2 is a temperature coefficient of refractive index of the second lens according to temperature change, DTn3 is a temperature coefficient of refractive index of the third lens according to temperature change, and DTn4 is a temperature coefficient of refractive index of the fourth lens according to temperature change.

In a general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the first lens has a concave object side, wherein the fourth lens has a concave object side, wherein the fifth lens has a concave object side, wherein the sixth lens has a negative refractive power, wherein the first lens to the sixth lens are disposed in order from an object side to an imaging side, and wherein 1.90< TTL/f <2.2, wherein TTL is a distance from the object side to the image side of the first lens, and f is a focal length of the optical imaging system.

The electronic device may include various optical imaging systems.

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 shows exemplary glasses on which exemplary optical imaging systems according to the first to seventh exemplary embodiments are mounted.

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 specified. The drawings may not be to scale and the relative sizes, proportions and descriptions of elements in the drawings 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 phrases "at least one of A, B and C", "at least one of A, B or C", etc. are intended to have separate meanings, and these phrases "at least one of A, B and C", "at least one of A, B or C", etc. also include examples in which one or more of each of A, B and/or C may be present (e.g., any combination of one or more of each of A, B and C), unless the respective description and embodiment requires interpretation of the list (e.g., "at least one of A, B and C") as having a combined meaning.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs and especially after understanding the disclosure of this application. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art, particularly in the context of the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

One or more examples may provide an optical imaging system with high resolution and non-degraded performance.

One or more examples may provide an optical imaging system with a very small Total Track Length (TTL), thereby reducing the size and weight of the AR device.

In one or more examples, the optical performance of the optical imaging system may not deteriorate in the range of-20 degrees to 60 degrees, thereby improving the operational reliability of the AR device.

In one or more examples, the first lens refers to the lens closest to the object (or subject), and the sixth 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 the object side of the first lens to the image side), TLx (distance from the point on the object side of the first lens closest to the object to the image side), image height (IMG HT) (height of the image side), and focal length of the lens may be expressed in "mm.

The thickness of the lenses, the distance between the lenses, and TTL may be distances calculated based on the optical axis of the lenses. 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 system according to the first example may include a plurality of lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens 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 and a lens having negative refractive power. For example, in an optical imaging system, the first lens may have positive refractive power, and the fourth lens may have negative refractive power. The optical imaging system according to the first example may include a lens having a concave object side and a lens having a convex image side. For example, in an optical imaging system, the first lens may have a concave object side and the fifth lens may have a convex image side. 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: f-number <1.90 and 1.90< TTL/f <2.2. In the conditional expression, TTL may be a distance from the object side of the first lens to the image plane, and f may be a focal length of the optical imaging system.

The optical imaging system according to the second example may include a plurality of lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens 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 a concave object side surface. For example, in the optical imaging system according to the second example, the object side surface of the first lens and the object side surface of the fourth lens may be concave. 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: -1.0< f3/f4< -0.8 and 1.90< TTL/f <2.20. In the conditional expression, TTL may be a distance from an object side surface to an image side surface of the first lens, f may be a focal length of the optical imaging system, f3 may be a focal length of the third lens, and f4 may be a focal length of the fourth lens.

The optical imaging system according to the third example may include first to sixth lenses 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<20

-100<f2/f<100

-30<V1-V2<40

TLx/f<2.25

0.80<L1TR/L2TR<1.40

|f1/f2|<2.0

-1.5<f1/f2<0.5

BFL/f<0.7

0.09<D12/f<0.10

0.09<D23/f<0.10

0.20<BFL/TLx<3.0

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, V1 may be an abbe number of the first lens, V2 may be an abbe number of the second lens, TLx may be a distance from a point (limited to an effective area) closest to the object on an object side of the first lens to the image plane, L1TR may be a maximum diameter (including a flange portion) of the first lens, L2TR may be a maximum diameter (including a flange portion) 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, D23 may be a distance from an image side of the second lens to an object side of the third lens, and BFL may be a distance from an image side of the sixth lens to the image plane.

An exemplary optical imaging system according to the fourth example may include first to sixth lenses disposed in order from the object side to the imaging side, and one or more of the following conditional expressions may be satisfied.

f-number <1.90

1.90<TTL/f<2.20

1.64<TTL/IMG HT<1.86

0.01<(R1-R2)/(R1+R2)<0.20

0.70<f3/IMG HT<1.0

-1.0<f3/f4<-0.80

-1.10<f3/f6<0.80

0.90<f4/f6<1.20

0.60<(R5+R6)/f3<1.0

0.40<(R7+R8)/f4<1.60

-3.0<(R9+R10)/f5<-1.60

-0.80<(R11+R12)/f6<-0.60

14<DTn1/DTn2<15

1.50<(DTn1+DTn3)/(DTn2+DTn4)<1.70

In the above conditional expression, TTL may be a distance from an object side surface to an image side surface of the first lens, IMG HT may be the height of the image plane, R1 may be the radius of curvature of the object side of the first lens, R2 may be the radius of curvature of the image side of the first lens, R5 may be the radius of curvature of the object side of the third lens, R6 may be the radius of curvature of the image side of the third lens, R7 may be the radius of curvature of the object side of the fourth lens, R8 may be the radius of curvature of the image side of the fourth lens, R9 may be the radius of curvature of the object side of the fifth lens, R10 may be the radius of curvature of the image side of the fifth lens, R11 may be the radius of curvature of the object side of the sixth lens, R12 may be the radius of curvature of the image side of the sixth lens, f3 may be the focal length of the third lens, f4 may be the focal length of the fourth lens, f5 may be the focal length of the fifth lens, f6 may be the focal length of the sixth lens, DTn1 may be the refractive index according to temperature change [10 ] ^-6 /℃]DTn2 may be a temperature coefficient of refractive index of the second lens according to temperature change, DTn3 may be a temperature coefficient of refractive index of the third lens according to temperature change, and DTn4 may be a temperature coefficient of refractive index of the fourth lens according to temperature change.

An exemplary optical imaging system according to the fifth example may include features according to the third example and features according to the fourth example. For example, the optical imaging system according to the fifth example may satisfy one or more features (conditional expressions) according to the fourth example while satisfying one or more features (conditional expressions) according to the third example.

An exemplary optical imaging system according to one or more examples may include one or more lenses having the following features, as desired. As an example, the optical imaging system according to the first example may include one of the first to sixth lenses having the following features. As another example, the optical imaging system according to the second to fifth examples may include one or more of the first to sixth 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 sixth lenses will be described.

The first lens may have optical power. For example, the first lens may have positive refractive power. One side surface of the first lens may be concave. For example, the object-side surface of the first lens may be concave. 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 workability. 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. For example, the refractive index of the first lens may be greater than 1.5. As a specific example, the refractive index of the first lens may be greater than 1.5 and less than 1.6. The first lens may have a predetermined abbe number. For example, the abbe number of the first lens may be 50 or more. As a specific example, the abbe number of the first lens may be greater than 50 and less than 60.

The second lens may have optical power. For example, the second lens may have a positive refractive power or a negative refractive power. One side 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 be a spherical surface or an 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 workability. 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. For example, the refractive index of the second lens may be greater than 1.4. As a specific example, the refractive index of the second lens may be greater than 1.4 and less than 1.7. The second lens may have a predetermined abbe number. For example, the abbe number of the second lens may be 20 or more. As a specific example, the abbe number of the second lens may be greater than 20 and less than 90.

The third lens may have a refractive power. For example, the third lens may have positive refractive power. One side 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 workability. 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. For example, the refractive index of the third lens may be greater than 1.5. As a specific example, the refractive index of the third lens may be greater than 1.5 and less than 1.6. The third lens may have a predetermined abbe number. For example, the abbe number of the third lens may be 50 or more. As a specific example, the abbe number of the third lens may be greater than 50 and less than 60.

The fourth lens may have a refractive power. For example, the fourth lens may have a negative refractive power. One side surface of the fourth lens may be concave. For example, the object side of the fourth lens may be concave. 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 workability. 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. For example, the refractive index of the fourth lens may be greater than 1.6. As a specific example, the refractive index of the fourth lens may be greater than 1.6 and less than 1.7. The fourth lens may have a predetermined abbe number. For example, the abbe number of the fourth lens may be 20 or more. As a specific example, the abbe number of the fourth lens may be greater than 20 and less than 30.

The fifth lens may have a refractive power. For example, the fifth lens may have positive refractive power. One side surface of the fifth lens may be convex. For example, the image side of the fifth lens may be convex. 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 workability. 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. For example, the refractive index of the fifth lens may be greater than 1.5. As a specific example, the refractive index of the fifth lens may be greater than 1.5 and less than 1.6. The fifth lens may have a predetermined abbe number. For example, the abbe number of the fifth lens may be 50 or more. As a specific example, the abbe number of the fifth lens may be greater than 50 and less than 60.

The sixth lens may have a refractive power. For example, the sixth lens may have a negative refractive power. One side surface of the sixth lens may be convex. For example, the object side surface of the sixth lens may be convex. 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 have a inflection point. As an example, the image side surface of the sixth lens may have a inflection point. The sixth lens may be formed of a material having high light transmittance and excellent workability. For example, the sixth lens may be formed of a plastic material. The sixth lens may have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.5. As a specific example, the refractive index of the sixth lens may be greater than 1.5 and less than 1.6. The sixth lens may have a predetermined abbe number. For example, the abbe number of the sixth lens may be 50 or more. As a specific example, the abbe number of the sixth lens may be greater than 50 and less than 60.

As described above, the first to sixth lenses may have spherical or aspherical surfaces. When the first to sixth 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 an arbitrary point on the aspherical surface to the optical axis, a to H may be aspherical constants, and Z (or SAG) may be a height in the optical axis direction from an arbitrary point on the aspherical surface to the vertex of the aspherical surface.

The exemplary 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 include diaphragms disposed on the first lens and the second lens. The aperture may be configured to adjust an amount of light incident in a direction of the image plane. The filter may be disposed between the final lens (sixth lens) and the image plane. The filter may be configured to block light having a specific wavelength. For reference, the filters described herein may be configured to block infrared rays, but light having a wavelength blocked by the filters is not limited to infrared rays.

An exemplary optical imaging system according to specific exemplary embodiments 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 plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160 disposed in order from the object side to the imaging side.

The first lens 110 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The second lens 120 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 130 may have a positive refractive power, and may have a convex object side and a convex image side. The fourth lens 140 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 150 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 160 may have a negative refractive power, and may have a convex object side and a concave image side. The sixth lens 160 may have a inflection point. For example, the object-side and image-side surfaces of the sixth lens 160 may have inflection points.

The optical imaging system 100 may further include other optical elements in addition to the first lens 110 to the sixth lens 160. For example, the optical imaging system 100 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 110 and the second lens 120, and the filter IF may be disposed between the sixth lens 160 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 110 to 160 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 2 shows aberration characteristics of the exemplary optical imaging system 100 according to the present exemplary embodiment. Tables 1 and 2 below show lens characteristics and distances between lens groups of the optical imaging system 100 according to the present exemplary embodiment.

TABLE 1

Face numbering	Component part	Radius of curvature	Thickness/distance	Refractive index	Abbe number	Maximum diameter	DTn
								S0	Object	Infinity of infinity	1500
S1		Infinity of infinity	0.0963
								S2	First lens	-1.4609	0.2860	1.541	56.0	1.263	-94.643
S3		-1.1991	0.0100
								S4	Aperture diaphragm	Infinity of infinity	0.1291
S5	Second lens	1.9236	0.1851	1.497	81.6	0.949	-6.560
								S6		1.6884	0.1379
S7	Third lens	2.2143	0.3521	1.541	56.0	1.104	-94.643
								S8		-1.0365	0.0627
S9	Fourth lens	-2.3292	0.1900	1.640	23.5	1.381	-110.976
								S10		1.5962	0.1450
S11	Fifth lens	-1.9813	0.4406	1.541	56.0	1.521	-94.643
								S12		-0.4466	0.0100
S13	Sixth lens	0.7784	0.2453	1.541	56.0	2.644	-94.643
								S14		0.3497	0.2798
S15	Optical filter	Infinity of infinity	0.1100	1.517	64.2
								S16		Infinity of infinity	0.1480
S17	Image surface	Infinity of infinity	0.2405

TABLE 2

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

The exemplary optical imaging system 200 may include a plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260 disposed in order from the object side to the imaging side.

The first lens 210 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The second lens 220 may have a negative refractive power, and may have a convex object side and a concave image side. The third lens 230 may have a positive refractive power, and may have a convex object side and a convex image side. The fourth lens 240 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 250 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The sixth lens 260 may have a negative refractive power and may have a convex object side and a concave image side. The sixth lens 260 may have a inflection point. For example, the object-side and image-side surfaces of the sixth lens 260 may have inflection points.

The optical imaging system 200 may include other optical elements in addition to the first lens 210 to the sixth lens 260. For example, the optical imaging system 200 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 210 and the second lens 220, and the filter IF may be disposed between the sixth lens 260 and the image plane IP. For reference, the filter IF may be omitted, IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 210 to 260 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 4 shows aberration characteristics of the exemplary optical imaging system 200 according to the present exemplary embodiment. Tables 3 and 4 below show lens characteristics and distances between lens groups of the optical imaging system 200 according to the present exemplary embodiment.

TABLE 3 Table 3

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TABLE 4 Table 4

An exemplary optical imaging system according to a third exemplary embodiment will be described with reference to fig. 5.

The exemplary optical imaging system 300 may include a plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360 disposed in order from the object side to the imaging side.

The first lens 310 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The second lens 320 may have a negative refractive power, and may have a convex object side and a concave image side. The third lens 330 may have a positive refractive power, and may have a convex object side and a convex image side. The fourth lens 340 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 350 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The sixth lens 360 may have a negative refractive power and may have a convex object side and a concave image side. The sixth lens 360 may have a inflection point. For example, the object-side and image-side surfaces of the sixth lens 360 may have inflection points.

The exemplary optical imaging system 300 may include other optical elements in addition to the first lens 310 through the sixth lens 360. For example, the optical imaging system 300 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 310 and the second lens 320, and the filter IF may be disposed between the sixth lens 360 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 310 to 360 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 6 shows aberration characteristics of the optical imaging system 300 according to the present exemplary embodiment. Tables 5 and 6 below show lens characteristics and distances between lens groups of the optical imaging system 300 according to the present exemplary embodiment.

TABLE 5

TABLE 6

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

The exemplary optical imaging system 400 may include a plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460, which are disposed in order from the object side to the imaging side.

The first lens 410 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The second lens 420 may have a positive refractive power and may have a convex object side and a concave image side. The third lens 430 may have positive refractive power, and may have a convex object side and a convex image side. The fourth lens 440 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 450 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The sixth lens 460 may have a negative refractive power and may have a convex object side and a concave image side. The sixth lens 460 may have a inflection point. For example, the object-side and image-side surfaces of the sixth lens 460 may have inflection points.

In addition to the first lens 410 through the sixth lens 460, the optical imaging system 400 may include other optical elements. For example, the optical imaging system 400 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 410 and the second lens 420, and the filter IF may be disposed between the sixth lens 460 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 410 to 460 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 8 shows aberration characteristics of the optical imaging system 400 according to the present exemplary embodiment. Tables 7 and 8 below show lens characteristics and distances between lens groups of the optical imaging system 400 according to the present exemplary embodiment.

TABLE 7

Table 8:

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

The exemplary optical imaging system 500 may include a plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 500 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560 disposed in order from the object side to the imaging side.

The first lens 510 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The second lens 520 may have a negative refractive power, and may have a convex object side and a concave image side. The third lens 530 may have a positive refractive power, and may have a convex object side and a convex image side. The fourth lens 540 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 550 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 560 may have a negative refractive power and may have a convex object side and a concave image side. The sixth lens 560 may have a inflection point. For example, the object side and image side of the sixth lens 560 may have inflection points.

In addition to the sixth lens 560 of the first lens 510, the exemplary optical imaging system 500 may include other optical elements. For example, the optical imaging system 500 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 510 and the second lens 520, and the filter IF may be disposed between the sixth lens 560 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 510 to 560 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 10 shows aberration characteristics of the exemplary optical imaging system 500 according to the present exemplary embodiment. Tables 9 and 10 below show lens characteristics and distances between lens groups of the optical imaging system 500 according to the present exemplary embodiment.

TABLE 9

Table 10

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 plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 600 may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660 disposed in order from the object side to the imaging side.

The first lens 610 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The second lens 620 may have a negative refractive power, and may have a convex object side and a concave image side. The third lens 630 may have positive refractive power, and may have a convex object side and a convex image side. The fourth lens 640 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 650 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 660 may have a negative refractive power, and may have a convex object side and a concave image side. The sixth lens 660 may have a inflection point. For example, the object-side and image-side surfaces of the sixth lens 660 may have inflection points.

In addition to the first lens 610 through the sixth lens 660, the exemplary optical imaging system 600 may include other optical elements. For example, the optical imaging system 600 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 610 and the second lens 620, and the filter IF may be disposed between the sixth lens 660 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 610 to 660 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 12 shows aberration characteristics of the exemplary optical imaging system 600 according to the present exemplary embodiment. Tables 11 and 12 below show lens characteristics and distances between lens groups of the optical imaging system 600 according to the present exemplary embodiment.

TABLE 11

Table 12

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

The optical imaging system 700 may include a plurality of lenses disposed in order from an object side to an imaging side. For example, the optical imaging system 700 may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, and a sixth lens 760 disposed in order from the object side to the imaging side.

The first lens 710 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The second lens 720 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 730 may have positive refractive power and may have a convex object side and a convex image side. The fourth lens 740 may have a negative refractive power, and may have a concave object side surface and a concave image side surface. The fifth lens 750 may have a positive refractive power, and may have a concave object side surface and a convex image side surface. The sixth lens 760 may have a negative refractive power, and may have a convex object side and a concave image side. The sixth lens 760 may have a inflection point. For example, the object-side and image-side surfaces of the sixth lens 760 may have inflection points.

The optical imaging system 700 may include other optical elements in addition to the first lens 710 to the sixth lens 760. For example, the optical imaging system 700 may further include an aperture ST and a filter IF.

The diaphragm ST may be disposed between the first lens 710 and the second lens 720, and the filter IF may be disposed between the sixth lens 760 and the image plane IP. In an example, the filter IF may be omitted IF desired. The image plane IP may be formed in a position where light incident through the first to sixth lenses 710 to 760 forms an image. For example, the image plane IP may be formed on the surface of the image sensor IS of the camera module, or may be formed inside the image sensor IS.

Fig. 14 shows aberration characteristics of the optical imaging system 700 according to the present exemplary embodiment. Tables 13 and 14 below show lens characteristics and distances between lens groups of the optical imaging system 700 according to the present exemplary embodiment.

TABLE 13

TABLE 14

Table 15 shows characteristic values of the exemplary optical imaging systems according to the first to seventh exemplary embodiments.

TABLE 15

Table 16 and table 17 below show conditional expression values of the exemplary optical imaging systems according to the first to seventh exemplary embodiments.

Table 16:

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TABLE 17

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An exemplary AR device including an exemplary optical imaging system will be described with reference to fig. 15.

An exemplary optical imaging system may be installed in an AR device. For example, the optical imaging systems according to the first to seventh exemplary embodiments may be mounted on the camera module 20 of the AR glasses 10. However, the field and form of application of the exemplary optical imaging system is not limited to the camera module 20 for the AR glasses 10.

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 having positive refractive power and having a concave object side surface;

a second lens having a refractive power;

a third lens having a refractive power;

a fourth lens having a negative refractive power;

a fifth lens having a convex image-side surface; and

a sixth lens having a refractive power,

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

wherein f-number is <1.90 and 1.90< TTL/f <2.2,

wherein TTL is the distance from the object side surface to the image side surface of the first lens, and f is the focal length of the optical imaging system, and

wherein the optical imaging system has six lenses in total.

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

0<f1/f<20，

wherein f1 is the focal length of the first lens.

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

-100<f2/f<100，

wherein f2 is the focal length of the second lens.

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

-30<V1-V2<40，

wherein V1 is the abbe number of the first lens and V2 is the abbe number of the second lens.

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

0.09<D12/f<0.10，

wherein D12 is a distance from an image side of the first lens to an object side of the second lens.

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

0.09<D23/f<0.10，

wherein D23 is a distance from an image side of the second lens to an object side of the third lens.

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

0.20<BFL/TLx<3.0，

where BFL is the distance from the image side of the sixth lens to the image plane, and TLx is the distance from the point on the object side of the first lens closest to the object to the image plane.

8. An electronic device comprising an optical imaging system according to any one of claims 1 to 7.

9. An optical imaging system, comprising:

a first lens having a concave object side surface;

a second lens having a refractive power;

a third lens having a refractive power;

a fourth lens having a concave object side surface;

a fifth lens having a refractive power; and

A sixth lens having a refractive power,

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

wherein, -1.0< f3/f4< -0.8 and 1.90< TTL/f <2.20,

wherein TTL is the distance from the object side surface to the image side surface of the first lens, f is the focal length of the optical imaging system, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens, an

Wherein the optical imaging system has six lenses in total.

10. The optical imaging system of claim 9, wherein the f-number is less than 1.90.

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

1.64<TTL/IMG HT<1.86，

wherein IMG HT is the height of the image plane.

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

0.70<f3/IMG HT<1.0，

wherein IMG HT is the height of the image plane.

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

-1.1<f3/f6<0.80，

where f6 is the focal length of the sixth lens.

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

0.90<f4/f6<1.20，

where f6 is the focal length of the sixth lens.

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

-0.80<(R11+R12)/f6<-0.60，

where R11 is the radius of curvature of the object-side surface of the sixth lens, R12 is the radius of curvature of the image-side surface of the sixth lens, and f6 is the focal length of the sixth lens.

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

14<DTn1/DTn2<15，

wherein DTn1 is a temperature coefficient of refractive index of the first lens according to temperature change, and DTn2 is a temperature coefficient of refractive index of the second lens according to temperature change.

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

1.50<(DTn1+DTn3)/(DTn2+DTn4)<1.70，

wherein DTn1 is a temperature coefficient of refractive index of the first lens according to temperature change, DTn2 is a temperature coefficient of refractive index of the second lens according to temperature change, DTn3 is a temperature coefficient of refractive index of the third lens according to temperature change, and DTn4 is a temperature coefficient of refractive index of the fourth lens according to temperature change.

18. An electronic device comprising an optical imaging system according to any one of claims 9 to 17.

19. An optical imaging system, comprising:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens,

wherein the first lens has a concave object side surface,

wherein the fourth lens has a concave object side surface,

wherein the fifth lens has a concave object side surface,

wherein the sixth lens has a negative refractive power,

Wherein the first lens to the sixth lens are disposed in order from an object side to an imaging side,

wherein 1.90< TTL/f <2.2,

wherein TTL is the distance from the object side surface to the image side surface of the first lens, and f is the focal length of the optical imaging system, and

wherein the optical imaging system has six lenses in total.

20. An electronic device comprising the optical imaging system of claim 19.