CN118226616A - Optical imaging system - Google Patents

Abstract

The optical imaging system includes a first lens group, a reflecting member, and a second lens group sequentially arranged along an optical axis. Each of the first lens group and the second lens group includes a plurality of lenses. The first lens group has positive refractive power. The effective diameter of the first lens among the plurality of lenses in the first lens group is largest among the plurality of lenses in the first lens group and the second lens group, and 0< DL1P/TTL <0.25 is satisfied, where DL1P is a distance on the optical axis from the object side surface of the first lens in the first lens group to the first surface of the reflecting member, and TTL is a distance on the optical axis from the object side surface of the first lens in the first lens group to the imaging surface.

Description

Optical imaging system

Cross Reference to Related Applications

The present application claims the benefit of priority from korean patent application No. 10-2023-0055670 filed in the korean intellectual property office on day 4 and 27 of 2023, 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 terminal may be equipped with a camera including an optical imaging system including a plurality of lenses to achieve video calling and image capturing.

A camera for a portable terminal may include an image sensor having high pixels (e.g., 1300 tens of thousands to 1 million pixels, etc.) to achieve image quality definition.

The above information is presented as background information only 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 one general aspect, an optical imaging system includes a first lens group, a reflective member, and a second lens group sequentially arranged along an optical axis. Each of the first lens group and the second lens group includes a plurality of lenses. The first lens group has positive refractive power. The effective diameter of the first lens among the plurality of lenses in the first lens group is largest among the plurality of lenses in the first lens group and the second lens group, and 0< DL1P/TTL <0.25 is satisfied, where DL1P is a distance on the optical axis from the object side surface of the first lens in the first lens group to the first surface of the reflecting member, and TTL is a distance on the optical axis from the object side surface of the first lens in the first lens group to the imaging surface.

The first lens group may include a first lens and a second lens arranged in order from the object side. One of the first lens and the second lens may have a positive focal length and an abbe number greater than 50, and the other may have a negative focal length and an abbe number less than 30.

V1-v2>29 may be satisfied, where v1 is the abbe number of the first lens and v2 is the abbe number of the second lens.

The first lens group may include a first lens and a second lens arranged in order from the object side, and may satisfy f1/f2<0.2, where f1 is a focal length of the first lens, and f2 is a focal length of the second lens.

0< D1/f <0.05 may be satisfied, where D1 is a distance between the first lens and the second lens on the optical axis, and f is a total focal length of the optical imaging system.

F >10mm may be satisfied, where f is the total focal length of the optical imaging system.

It is possible to satisfy 0.5< DL3i/TTL <0.6, where DL3i is a distance on the optical axis from the object side surface to the imaging surface of the foremost lens of the second lens group.

2< Ttl/BFL <6 may be satisfied, where BFL is the distance on the optical axis from the image side to the imaging plane of the last lens of the second lens group.

1<F/fG1<1.6 may be satisfied, where f is the total focal length of the optical imaging system and fG1 is the focal length of the first lens group.

0.4< |Fg1/fg2| <1.1 may be satisfied, where fG1 is the focal length of the first lens group and fG2 is the focal length of the second lens group.

Nv50.gtoreq.2 and Nv28.gtoreq.3 may be satisfied, where Nv50 is the number of lenses having an Abbe number greater than 50 and Nv28 is the number of lenses having an Abbe number less than 28.

Among the plurality of lenses in the second lens group, two or more lenses arranged in order from the object side may have a refractive index of 1.61 or more.

The number of the plurality of lenses in the second lens group may be equal to or greater than the number of the plurality of lenses in the first lens group.

The first lens group may include a first lens and a second lens, and the second lens group may include a third lens, a fourth lens, a fifth lens, and a sixth lens.

The first lens may have a positive refractive power, and the second lens may have a negative refractive power.

In another general aspect, an optical imaging system includes: a first lens group including a first lens and a second lens; a reflecting member; and a second lens group including a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens group, the reflecting member, and the second lens group are sequentially arranged along the optical axis. The first lens has a positive refractive power, and the second lens has a negative refractive power. The effective diameter of the first lens is largest among the lenses of the first lens group and the second lens group. Satisfy 0< DL1P/TTL <0.25, where DL1P is a distance on the optical axis from the object side surface of the first lens to the first surface of the reflecting member, and TTL is a distance on the optical axis from the object side surface of the first lens to the imaging surface. 2< ttl/BFL <6 is satisfied, where BFL is the distance on the optical axis from the image side to the imaging plane of the last lens in the second lens group.

V1-v2>29 may be satisfied, where v1 is the abbe number of the first lens and v2 is the abbe number of the second lens.

It is possible to satisfy f1/f2<0.2, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

Other features and aspects will become apparent from the accompanying drawings and from the following detailed description.

Drawings

Fig. 1 is a block diagram of an optical imaging system according to a first embodiment of the present disclosure;

Fig. 2 is a view showing aberration characteristics of the optical imaging system shown in fig. 1;

FIG. 3 is a block diagram of an optical imaging system according to a second embodiment of the present disclosure;

fig. 4 is a view showing aberration characteristics of the optical imaging system shown in fig. 3;

fig. 5 is a block diagram of an optical imaging system according to a third embodiment of the present disclosure;

Fig. 6 is a view showing aberration characteristics of the optical imaging system shown in fig. 5;

Fig. 7 is a block diagram of an optical imaging system according to a fourth embodiment of the present disclosure;

fig. 8 is a view showing aberration characteristics of the optical imaging system shown in fig. 7;

Fig. 9 is a block diagram of an optical imaging system according to a fifth embodiment of the present disclosure;

fig. 10 is a view showing aberration characteristics of the optical imaging system shown in fig. 9;

fig. 11 is a block diagram of an optical imaging system according to a sixth embodiment of the present disclosure;

Fig. 12 is a view showing aberration characteristics of the optical imaging system shown in fig. 11;

fig. 13 is a block diagram of an optical imaging system according to a seventh embodiment of the present disclosure;

fig. 14 is a view showing aberration characteristics of the optical imaging system shown in fig. 13;

fig. 15 is a block diagram of an optical imaging system according to an eighth embodiment of the present disclosure;

fig. 16 is a view showing aberration characteristics of the optical imaging system shown in fig. 15; and

Fig. 17 is a block diagram of an optical imaging system according to a ninth embodiment of the present disclosure.

Throughout the drawings and the detailed description, like reference numerals refer to like elements unless otherwise specified. 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

Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that examples are not limited thereto.

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 this disclosure. For example, the order of the operations described herein is merely an example, and is not limited to the order set forth herein except for operations that must occur in a particular order, but may be altered as will be apparent upon an understanding of the disclosure. In addition, descriptions of features well known in the art may be omitted for the sake of 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.

Throughout the specification, when an element such as a layer, region or substrate is described as being "on," connected to, "or" coupled to "another element, the element may be directly on," directly "connected to," or directly "coupled to" the other element, or there may be one or more other elements interposed between the element and the other element. In contrast, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no other elements intervening elements present.

As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more; likewise, "at least one" includes any one of the listed items associated and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. 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.

Spatially relative terms such as "above … …," "upper," "below … …," "lower," and the like may be used herein for descriptive convenience to describe one element's relationship to another element as illustrated in the figures. In addition to the orientations depicted in the drawings, these spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, elements described as "on" or "above" relative to another element would then be oriented "under" or "below" the other element. Thus, the expression "above … …" encompasses both orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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. 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.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, examples described herein are not limited to the specific shapes shown in the drawings, but include shape variations that occur during manufacture.

It should be noted that, herein, the use of the word "may" with respect to an example, such as with respect to what an example may include or implement, means that there is at least one example in which such features are included or implemented, and all examples are not limited thereto.

The features of the examples described herein may be combined in various ways that will be apparent after an understanding of the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations that will be apparent after an understanding of the present disclosure are also possible.

According to an exemplary embodiment of the present disclosure, an optical imaging system may be installed in a portable electronic device. For example, the optical imaging system may be a configuration of a camera module mounted on the portable electronic device. The portable electronic device may be a portable electronic device such as a mobile communication terminal, a smart phone or a tablet PC.

In an exemplary embodiment of the present disclosure, the first lens (or the foremost lens) refers to a lens closest to the object side, and the last lens (or the rearmost lens) refers to a lens closest to the imaging plane (or the image sensor).

In addition, in each lens, the first surface represents a surface (or object side) near the object side, and the second surface represents a surface (or image side) near the image side. In addition, in one or more exemplary embodiments, the values of radius of curvature, thickness, distance, and focal length of the lens are all in mm, and the field of view (FOV) is in degrees.

In addition, in the description of the shape of each lens, one surface convex means that the paraxial region of the corresponding surface is convex, and one surface concave means that the paraxial region of the corresponding surface is concave.

Meanwhile, the paraxial region refers to a very narrow region near the optical axis.

The imaging plane may refer to a virtual surface on which the optical imaging system forms a focal point. Alternatively, the imaging plane may refer to one surface of the image sensor on which light is received.

According to an exemplary embodiment of the present disclosure, an optical imaging system includes a plurality of lens groups. For example, the optical imaging system may include a first lens group and a second lens group.

Each of the first lens group and the second lens group includes at least one lens. For example, the first lens group may include two or more lenses, and the second lens group may include four or more lenses. Thus, the optical imaging system comprises at least six lenses. Each lens is spaced apart from each other by a predetermined distance.

In an exemplary embodiment, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side.

According to an exemplary embodiment of the present disclosure, an optical imaging system may include a reflective member having a reflective surface that changes an optical path. In an example, the reflective member may be a mirror or a prism.

By bending the optical path via the reflecting member, the optical path can be extended in a relatively narrow space.

Therefore, the optical imaging system can have a long focal length while miniaturizing the optical imaging system.

The reflection member may be disposed between the first lens group and the second lens group. In an example, the reflective member may be disposed between the second lens and the third lens.

The optical imaging system may further include an image sensor that converts an image of the incident object into an electrical signal.

In addition, the optical imaging system may further include an infrared blocking filter (hereinafter referred to as "filter") that blocks infrared rays. The optical filter may be disposed between the reflecting member and the imaging plane.

In addition, the optical imaging system may further include an aperture that adjusts the amount of light.

The lenses of the first lens group and the lenses of the second lens group may both be made of plastic.

Each of the lenses of the first lens group and the lenses of the second lens group may have at least one aspherical surface.

According to an exemplary embodiment of the present disclosure, the optical imaging system may satisfy at least one of the following conditional expressions.

Conditional expression 1: f1/f2<0.2

Conditional expression 2: v1-v2>29

Conditional expression 3: f >10mm

Conditional expression 4:0.5< DL3i/TTL <0.6

Conditional expression 5:0< DL1P/TTL <0.25

Conditional expression 6:1<f/fG1<1.6

Conditional expression 7:0.4< |fG1/fG2| <1.1

Conditional expression 8:0< D1/f <0.05

Conditional expression 9:2< TTL/BFL <6

Conditional expression 10: nv50 is greater than or equal to 2

Conditional expression 11: nv28 is greater than or equal to 3

In the conditional expression, f is the total focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

Here, v1 is the abbe number of the first lens, and v2 is the abbe number of the second lens.

DL1P is a distance on the optical axis from the object side surface of the first lens to the first surface of the reflecting member, DL3i is a distance on the optical axis from the object side surface of the foremost lens of the second lens group to the imaging surface, and D1 is a distance on the optical axis between the first lens and the second lens.

TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface. BFL is the distance on the optical axis from the image side to the imaging plane of the last lens of the second lens group.

Nv50 is the number of lenses having an abbe number greater than 50 among the plurality of lenses included in the optical imaging system, and Nv28 is the number of lenses having an abbe number less than 28 among the plurality of lenses included in the optical imaging system.

The first lens group has positive refractive power as a whole. In addition, light passing through the first lens group disposed in front of the reflective member may be refracted to be converged and incident on the reflective member.

In an exemplary embodiment, the first lens group may include two lenses (e.g., a first lens and a second lens). One of the first lens and the second lens has a positive focal length and the other has a negative focal length. Lenses having positive focal lengths have abbe numbers greater than 50, and lenses having negative focal lengths may have abbe numbers less than 30.

For example, the first lens may have a positive refractive power, and the second lens may have a negative refractive power. In addition, the abbe number of the first lens may be greater than 50, and the abbe number of the second lens may be less than 30.

The aperture may be disposed between the first lens group and the reflecting member. For example, an aperture may be provided between the second lens and the reflecting member.

The second lens group includes four or more lenses, and has positive or negative refractive power as a whole.

In an exemplary embodiment, the second lens group includes a third lens, a fourth lens, a fifth lens, and a sixth lens. The third lens to the sixth lens may each have positive refractive power or negative refractive power.

One or more lenses included in the first lens group may be high refractive index lenses. For example, when the first lens group includes two lenses, a lens having a larger absolute value of focal length among the two lenses may be a high refractive index lens. The high refractive index lens has a refractive index of 1.61 or more.

In addition, the first lens and the second lens may be formed of materials having different optical characteristics. For example, the first lens may be a material having a large abbe number, and the second lens may be a material having an abbe number smaller than that of the first lens. Therefore, the chromatic aberration correction performance can be improved. For example, the first lens may have an abbe number greater than 50, and the second lens may have an abbe number less than 28.

The effective radius of the lens included in the first lens group may be larger than the effective radius of the lens included in the second lens group. In addition, the effective radius of the first lens may be the largest among lenses included in the optical imaging system. In an exemplary embodiment, the effective radius of the first lens may be 2.5mm or more.

Two or more lenses of the second lens group may be of high refractive index. Two or more high refractive index lenses may be arranged in series. The high refractive index lens has a refractive index of 1.61 or more.

In an exemplary embodiment, when the second lens group includes four lenses, each of the four lenses has a refractive index and an abbe number different from those of lenses disposed adjacent to each other.

The number of lenses included in the second lens group is equal to or greater than the number of lenses included in the first lens group.

According to exemplary embodiments of the present disclosure, an optical imaging system may have characteristics of a telephoto lens including a relatively narrow field of view (FOV) and a long focal length.

According to a first embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 1 and 2.

According to a first embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflective member P, and a second lens group G2.

The first lens group G1 includes a first lens 110 and a second lens 120, and the second lens group G2 includes a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160.

In addition, the optical imaging system may further include a filter 170 and an image sensor IS.

According to a first exemplary embodiment of the present disclosure, the optical imaging system may form a focal point on the imaging plane 180. Imaging plane 180 may represent the surface on which the optical imaging system forms a focal point. In an example, the imaging plane 180 may represent one surface of the image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 120 and the third lens 130, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 1.

TABLE 1

Face number	Component part	Radius of curvature	Thickness or distance of	Refractive index	Abbe number	Focal length
							S1	First lens	7.155	2.000	1.537	55.7	11.7555
S2		-48.099	0.989
							S3	Second lens	-1000	0.500	1.621	26.0	-17.2154
S4		10.801	2.947
							S5	Aperture diaphragm	Infinity of infinity	0.600
S6	Reflective member	Infinity of infinity	2.250	1.839	37.3
							S7		Infinity of infinity	2.250	1.839	37.3
S8		Infinity of infinity	2.200
							S9	Third lens	-174.75	1.500	1.547	56.1	-64.7729
S10		44.525	1.500
							S11	Fourth lens	10.5101	1.000	1.668	20.4	13.7422
S12		-70.0315	1.500
							S13	Fifth lens	-18.3662	1.000	1.621	26.0	-4.81095
S14		3.6396	2.000
							S15	Sixth lens	14.5873	1.492	1.547	56.1	7.92245
S16		-5.93459	0.030
							S17	Optical filter	Infinity of infinity	0.239	1.519	64.2
S18		Infinity of infinity	4.904
							S19	Imaging surface	Infinity of infinity

In an example, the total focal length f of the optical imaging system according to the first embodiment of the present disclosure is 27mm, the focal length fG1 of the first lens group G1 is 25.614mm, and the focal length fG2 of the second lens group G2 is 32mm.

In the first embodiment of the present disclosure, the first lens 110 has positive refractive power, and the first and second surfaces of the first lens 110 are convex.

The second lens 120 has a negative refractive power, and the first and second surfaces of the second lens 120 are concave.

The third lens 130 has a negative refractive power, and the first and second surfaces of the third lens 130 are concave.

The fourth lens 140 has positive refractive power, and the first and second surfaces of the fourth lens 140 are convex.

The fifth lens 150 has a negative refractive power, and the first and second surfaces of the fifth lens 150 are concave.

The sixth lens 160 has positive refractive power, and the first and second surfaces of the sixth lens 160 are convex.

In addition, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 2.

According to a second embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 3 and 4.

According to a second embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflective member P, and a second lens group G2.

The first lens group G1 includes a first lens 210 and a second lens 220. The second lens group G2 includes a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260.

In addition, the optical imaging system may further include a filter 270 and an image sensor IS.

According to a second embodiment of the present disclosure, an optical imaging system may form a focal point on the imaging plane 280. Imaging plane 280 may refer to the surface on which the optical imaging system forms a focal point. For example, the imaging plane 280 may refer to one surface of the image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 220 and the third lens 230, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 2.

TABLE 2

In an example, the total focal length f of the optical imaging system according to the second embodiment of the present disclosure is 27mm, the focal length fG1 of the first lens group G1 is 24.583mm, and the focal length fG2 of the second lens group G2 is 32mm.

In the second embodiment of the present disclosure, the first lens 210 has positive refractive power, and the first and second surfaces of the first lens 210 are convex.

The second lens 220 has a negative refractive power, and the first and second surfaces of the second lens 220 are concave.

The third lens 230 has a negative refractive power, and the first and second surfaces of the third lens 230 are concave.

The fourth lens 240 has a positive refractive power, a first surface of the fourth lens 240 is convex, and a second surface of the fourth lens 240 is concave.

The fifth lens 250 has a negative refractive power, and the first and second surfaces of the fifth lens 250 are concave.

The sixth lens 260 has positive refractive power, and the first and second surfaces of the sixth lens 260 are convex.

In addition, the optical imaging system configured as described above may have aberration characteristics as shown in fig. 4.

According to a third embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 5 and 6.

According to a third embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflecting member P, and a second lens group G2.

The first lens group G1 includes a first lens 310 and a second lens 320, and the second lens group G2 includes a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360.

In addition, the optical imaging system may further include a filter 370 and an image sensor IS.

According to a third embodiment of the present disclosure, an optical imaging system may form a focal point on the imaging surface 380. Imaging plane 380 may represent the surface on which the optical imaging system forms a focal point. In an example, the imaging plane 380 may represent one surface of the image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 320 and the third lens 330, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 3.

TABLE 3 Table 3

In an example, the total focal length f of the optical imaging system according to the third embodiment of the present disclosure is 27mm, the focal length fG1 of the first lens group G1 is 19.828mm, and the focal length fG2 of the second lens group G2 is-30.002 mm.

In a third embodiment of the present disclosure, the first lens 310 has positive refractive power, and the first and second surfaces of the first lens 310 are convex.

The second lens 320 has a negative refractive power, a first surface of the second lens 320 is convex, and a second surface of the second lens 320 is concave.

The third lens 330 has a negative refractive power, and the first and second surfaces of the third lens 330 are concave.

The fourth lens 340 has a positive refractive power, a first surface of the fourth lens 340 is convex, and a second surface of the fourth lens 340 is concave.

The fifth lens 350 has a negative refractive power, and the first and second surfaces of the fifth lens 350 are concave.

The sixth lens 360 has a positive refractive power, the first surface of the sixth lens 360 is concave, and the second surface of the sixth lens 360 is convex.

In addition, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 6.

According to a fourth embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 7 and 8.

According to a fourth embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflecting member P, and a second lens group G2.

The first lens group G1 includes a first lens 410 and a second lens 420. The second lens group G2 includes a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460.

In addition, the optical imaging system may further include a filter 470 and an image sensor IS.

According to a fourth embodiment of the present disclosure, an optical imaging system may form a focal point on an imaging plane 480. Imaging plane 480 may represent the surface on which the optical imaging system forms a focal point. In an example, the imaging plane 480 may represent one surface of the image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 420 and the third lens 430, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 4.

TABLE 4 Table 4

Face number	Component part	Radius of curvature	Thickness or distance of	Refractive index	Abbe number	Focal length
							S1	First lens	6.380	1.500	1.537	55.7	10.4704
S2		-43.554	0.050
							S3	Second lens	-212.881	0.400	1.620	25.9	-20.2702
S4		13.366	0.700
							S5	Aperture diaphragm	Infinity of infinity	0.600
S6	Reflective member	Infinity of infinity	2.250	1.839	37.3
							S7		Infinity of infinity	2.250	1.839	37.3
S8		Infinity of infinity	4.000
							S9	Third lens	321.729	0.600	1.547	56.1	-24.9354
S10		13.0649	0.050
							S11	Fourth lens	6.4942	0.500	1.668	20.4	18.2948
S12		13.4237	0.721
							S13	Fifth lens	-25.9449	0.500	1.646	23.5	-15.6939
S14		16.7475	0.095
							S15	Sixth lens	42.3309	0.600	1.537	55.7	-261.635
S16		32.3707	9.000
							S17	Optical filter	Infinity of infinity	0.210	1.519	64.2
S18		Infinity of infinity	2.154
							S19	Imaging surface	Infinity of infinity

In an example, the total focal length f of the optical imaging system according to the fourth embodiment of the present disclosure is 30.6331mm, the focal length fG1 of the first lens group G1 is 19.396mm, and the focal length fG2 of the second lens group G2 is-19.299 mm.

In the fourth embodiment of the present disclosure, the first lens 410 has positive refractive power, and the first surface and the second surface of the first lens 410 are convex.

The second lens 420 has a negative refractive power, and the first and second surfaces of the second lens 420 are concave.

The third lens 430 has a negative refractive power, a first surface of the third lens 430 is convex, and a second surface of the third lens 430 is concave.

The fourth lens 440 has a positive refractive power, a first surface of the fourth lens 440 is convex, and a second surface of the fourth lens 440 is concave.

The fifth lens 450 has a negative refractive power, and the first and second surfaces of the fifth lens 450 are concave.

The sixth lens 460 has a negative refractive power, the first surface of the sixth lens 460 is convex, and the second surface of the sixth lens 460 is concave.

In addition, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 8.

According to a fifth embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 9 and 10.

According to a fifth embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflecting member P, and a second lens group G2.

The first lens group G1 includes a first lens 510 and a second lens 520. The second lens group G2 includes a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560.

In addition, the optical imaging system may further include a filter 570 and an image sensor IS.

According to a fifth embodiment of the present disclosure, an optical imaging system may form a focal point on an imaging surface 580. Imaging plane 580 may represent the surface on which the optical imaging system forms a focal point. In an example, the imaging surface 580 may represent one surface of the image sensor IS through which light IS received.

The reflective member P may be disposed between the second lens 520 and the third lens 530, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 5.

TABLE 5

Face number	Component part	Radius of curvature	Thickness or distance of	Refractive index	Abbe number	Focal length
							S1	First lens	6.652	1.450	1.537	55.7	11.0638
S2		-51.524	0.050
							S3	Second lens	1952.58	0.400	1.620	25.9	-22.1856
S4		13.658	0.700
							S5	Aperture diaphragm	Infinity of infinity	0.600
S6	Reflective member	Infinity of infinity	2.250	1.839	37.3
							S7		Infinity of infinity	2.250	1.839	37.3
S8		Infinity of infinity	4.000
							S9	Third lens	47.2812	0.600	1.547	56.1	90.7897
S10		1000	0.050
							S11	Fourth lens	11.0308	0.500	1.668	20.4	68.9032
S12		14.242	0.666
							S13	Fifth lens	113.654	0.500	1.620	25.9	-83.1146
S14		35.3965	0.202
							S15	Sixth lens	-18.8479	0.600	1.537	55.7	-17.2427
S16		18.4127	9.000
							S17	Optical filter	Infinity of infinity	0.210	1.519	64.2
S18		Infinity of infinity	0.765
							S19	Imaging surface	Infinity of infinity

In an example, the total focal length f of the optical imaging system according to the fifth embodiment of the present disclosure is 27mm, the focal length fG1 of the first lens group G1 is 20.016mm, and the focal length fG2 of the second lens group G2 is-24.780 mm.

In a fifth embodiment of the present disclosure, the first lens 510 has positive refractive power, and the first and second surfaces of the first lens 510 are convex.

The second lens 520 has a negative refractive power, a first surface of the second lens 520 is convex, and a second surface of the second lens 520 is concave.

The third lens 530 has a positive refractive power, a first surface of the third lens 530 is convex, and a second surface of the third lens 530 is concave.

The fourth lens 540 has a positive refractive power, the first surface of the fourth lens 540 is convex, and the second surface of the fourth lens 540 is concave.

The fifth lens 550 has a negative refractive power, a first surface of the fifth lens 550 is convex, and a second surface of the fifth lens 550 is concave.

The sixth lens 560 has a negative refractive power, and the first and second surfaces of the sixth lens 560 are concave.

In addition, the optical imaging system configured as described above may have aberration characteristics shown in fig. 10.

According to a sixth embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 11 and 12.

According to a sixth embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflecting member P, and a second lens group G2.

The first lens group G1 includes a first lens 610 and a second lens 620, and the second lens group G2 includes a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660.

In addition, the optical imaging system may further include a filter 670 and an image sensor IS.

According to a sixth embodiment of the present disclosure, an optical imaging system may form a focal point on imaging surface 680. Imaging plane 680 may represent the surface on which the optical imaging system forms a focal point. In an example, imaging plane 680 may represent one surface of image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 620 and the third lens 630, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 6.

TABLE 6

In an example, the total focal length f of the optical imaging system according to the sixth embodiment of the present disclosure is 27.01mm, the focal length fG1 of the first lens group G1 is 19.270mm, and the focal length fG2 of the second lens group G2 is-25 mm.

In the sixth embodiment of the present disclosure, the first lens 610 has positive refractive power, and the first and second surfaces of the first lens 610 are convex.

The second lens 620 has a negative refractive power, the first surface of the second lens 620 is convex, and the second surface of the second lens 620 is concave.

The third lens 630 has a positive refractive power, the first surface of the third lens 630 is convex, and the second surface of the third lens 630 is concave.

The fourth lens 640 has a positive refractive power, a first surface of the fourth lens 640 is convex, and a second surface of the fourth lens 640 is concave.

The fifth lens 650 has a negative refractive power, and the first and second surfaces of the fifth lens 650 are concave.

The sixth lens 660 has a negative refractive power, and the first surface and the second surface of the sixth lens 660 are concave.

In addition, the optical imaging system configured as described above may have aberration characteristics shown in fig. 12.

According to a seventh embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 13 and 14.

According to a seventh embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a reflecting member P, and a second lens group G2.

The first lens group G1 includes a first lens 710 and a second lens 720, and the second lens group G2 includes a third lens 730, a fourth lens 740, a fifth lens 750, and a sixth lens 760.

In addition, the optical imaging system may further include a filter 770 and an image sensor IS.

According to a seventh embodiment of the present disclosure, the optical imaging system may form a focal point on the imaging surface 780. Imaging plane 780 may represent the surface on which the optical imaging system forms a focal point. In an example, the imaging surface 780 may refer to one surface of the image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 720 and the third lens 730, and may have a reflective surface that changes an optical path. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 7.

TABLE 7

In an example, the total focal length f of the optical imaging system according to the seventh embodiment of the present disclosure is 27.01mm, the focal length fG1 of the first lens group G1 is 19.730mm, and the focal length fG2 of the second lens group G2 is-26.984 mm.

In a seventh embodiment of the present disclosure, the first lens 710 has a positive refractive power, a first surface of the first lens 710 is convex, and a second surface of the first lens 710 is concave.

The second lens 720 has a negative refractive power, a first surface of the second lens 720 is convex, and a second surface of the second lens 720 is concave.

The third lens 730 has positive refractive power, and the first and second surfaces of the third lens 730 are convex.

The fourth lens 740 has a negative refractive power, and the first and second surfaces of the fourth lens 740 are concave.

The fifth lens 750 has positive refractive power, and the first and second surfaces of the fifth lens 750 are convex.

The sixth lens 760 has a negative refractive power, and the first and second surfaces of the sixth lens 760 are concave.

In addition, the optical imaging system configured as described above may have aberration characteristics shown in fig. 14.

According to an eighth embodiment of the present disclosure, an optical imaging system will be described with reference to fig. 15 and 16.

The optical imaging system according to the eighth embodiment of the present disclosure includes a first lens group G1, a reflecting member P, and a second lens group G2.

The first lens group G1 includes a first lens 810 and a second lens 820. The second lens group G2 includes a third lens 830, a fourth lens 840, a fifth lens 850, and a sixth lens 860.

In addition, the optical imaging system may further include a filter 870 and an image sensor IS.

According to an eighth embodiment of the present disclosure, an optical imaging system may form a focal point on an imaging surface 880. Imaging plane 880 may represent the surface on which the optical imaging system forms a focal point. For example, imaging plane 880 may represent one surface of image sensor IS on which light IS received.

The reflective member P may be disposed between the second lens 820 and the third lens 830, and may have a reflective surface that changes an optical path. The reflecting member P may be a reflecting mirror, but may also be provided as a prism.

The lens characteristics (radius of curvature, thickness of lenses, distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 8.

TABLE 8

In an example, the total focal length f of the optical imaging system according to the eighth embodiment of the present disclosure is 25.8467mm, the focal length fG1 of the first lens group G1 is 20.734mm, and the focal length fG2 of the second lens group G2 is-41.298 mm.

In an eighth embodiment of the present disclosure, the first lens 810 has a positive refractive power, a first surface of the first lens 810 is convex, and a second surface of the first lens 810 is concave.

The second lens 820 has a negative refractive power, a first surface of the second lens 820 is convex, and a second surface of the second lens 820 is concave.

The third lens 830 has positive refractive power, and the first and second surfaces of the third lens 830 are convex.

The fourth lens 840 has a negative refractive power, a first surface of the fourth lens 840 is concave, and a second surface of the fourth lens 840 is convex.

The fifth lens 850 has a negative refractive power, and the first and second surfaces of the fifth lens 850 are concave.

The sixth lens 860 has a negative refractive power, a first surface of the sixth lens 860 is convex, and a second surface of the sixth lens 860 is concave.

In addition, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 16.

An optical imaging system according to a ninth embodiment of the present disclosure will be described with reference to fig. 17.

According to a ninth embodiment of the present disclosure, an optical imaging system includes a first lens group G1, a first reflecting member P1, a second lens group G2, and a second reflecting member P2.

The first lens group G1 and the second lens group G2 may be the first lens group G1 and the second lens group G2 according to any one of the first to eighth embodiments.

In this embodiment, the first reflecting member P1 may be disposed between the first lens group G1 and the second lens group G2. The second reflecting member P2 may be disposed between the second lens group G2 and the image sensor IS.

When the optical axis of the first lens group G1 IS defined as a first optical axis, the optical axis of the second lens group G2 IS defined as a second optical axis, and the optical axis of the light reflected from the second reflecting member P2 reaching the image sensor IS defined as a third optical axis, the first and second optical axes are perpendicular to each other, and the second and third optical axes are perpendicular to each other.

An aspect of the present disclosure is to provide an optical imaging system having a small size and capable of achieving high resolution. In the optical imaging system according to the exemplary embodiments of the present disclosure, the size of the optical imaging system may be reduced and a high resolution image may be captured.

While specific examples have been shown and described above, it will be apparent, after an understanding of the present disclosure, 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. Thus, the scope of the disclosure is not to be limited by the specific embodiments, but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims (17)

1. An optical imaging system, comprising:

a first lens group, a reflecting member, a second lens group, and an image sensor sequentially arranged along an optical axis,

Wherein each of the first lens group and the second lens group includes a plurality of lenses,

The first lens group has a positive refractive power,

The effective diameter of a first lens among the plurality of lenses in the first lens group is largest among the plurality of lenses in the first lens group and the second lens group, and

Satisfying 0< DL1P/TTL <0.25, where DL1P is a distance on the optical axis from an object side face of the first lens in the first lens group to a first surface of the reflecting member, and TTL is a distance on the optical axis from the object side face of the first lens in the first lens group to an imaging surface.

2. The optical imaging system according to claim 1, wherein the first lens group includes the first lens and the second lens arranged in order from an object side,

One of the first lens and the second lens has a positive focal length and an abbe number greater than 50, and the other has a negative focal length and an abbe number less than 30.

3. The optical imaging system of claim 2, wherein v1-v2>29 is satisfied, wherein v1 is the abbe number of the first lens and v2 is the abbe number of the second lens.

4. The optical imaging system according to claim 1, wherein the first lens group includes the first lens and the second lens arranged in order from an object side, and

Satisfies f1/f2<0.2, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

5. The optical imaging system of claim 4, wherein 0< D1/f <0.05 is satisfied, wherein D1 is a distance between the first lens and the second lens on the optical axis, and f is a total focal length of the optical imaging system.

6. The optical imaging system of claim 1, wherein f >10mm is satisfied, wherein f is a total focal length of the optical imaging system.

7. The optical imaging system of claim 1, wherein 0.5< DL3i/TTL <0.6 is satisfied, wherein DL3i is a distance on the optical axis from an object side face of a foremost lens of the second lens group to the imaging face.

8. The optical imaging system of claim 1, wherein 2< ttl/BFL <6 is satisfied, wherein BFL is a distance on the optical axis from an image side of a last lens of the plurality of lenses in the second lens group to the imaging plane.

9. The optical imaging system of claim 1, wherein 1<f/fG1<1.6 is satisfied, where f is a total focal length of the optical imaging system and fG1 is a focal length of the first lens group.

10. The optical imaging system of claim 1, wherein 0.4< |fg1/fG2| <1.1 is satisfied, where fG1 is a focal length of the first lens group and fG2 is a focal length of the second lens group.

11. The optical imaging system of claim 1, wherein nv50 ≡2 and nv28 ≡3 are satisfied, wherein nv50 is the number of lenses having abbe numbers greater than 50 and nv28 is the number of lenses having abbe numbers less than 28.

12. The optical imaging system according to claim 11, wherein, among the plurality of lenses in the second lens group, two or more lenses arranged in order from an object side have a refractive index of 1.61 or more.

13. The optical imaging system of claim 1, wherein the number of the plurality of lenses in the second lens group is equal to or greater than the number of the plurality of lenses in the first lens group.

14. The optical imaging system of claim 13, wherein the first lens group includes the first lens and the second lens, and the second lens group includes a third lens, a fourth lens, a fifth lens, and a sixth lens, and

The first lens has a positive refractive power, and the second lens has a negative refractive power.

15. An optical imaging system, comprising:

a first lens group including a first lens and a second lens;

A reflecting member;

A second lens group including a third lens, a fourth lens, a fifth lens, and a sixth lens; and

An image sensor that receives light passing through the first lens group and the second lens group,

Wherein the first lens group, the reflecting member and the second lens group are sequentially arranged along an optical axis,

Wherein the first lens has a positive refractive power and the second lens has a negative refractive power,

Wherein an effective diameter of the first lens is largest among lenses of the first lens group and the second lens group,

Wherein 0< DL1P/TTL <0.25 is satisfied, wherein DL1P is a distance on the optical axis from the object side surface of the first lens to the first surface of the reflecting member, and TTL is a distance on the optical axis from the object side surface of the first lens to an imaging surface, and

Wherein 2< ttl/BFL <6 is satisfied, wherein BFL is the distance on the optical axis from the image side of the last lens in the second lens group to the imaging plane.

16. The optical imaging system of claim 15, wherein v1-v2>29 is satisfied, wherein v1 is an abbe number of the first lens and v2 is an abbe number of the second lens.

17. The optical imaging system of claim 15, wherein f1/f2<0.2 is satisfied, wherein f1 is a focal length of the first lens and f2 is a focal length of the second lens.