Camera modules and terminal equipment

Abstract

The present application relates to a camera module and a terminal device. The camera module includes: a first optical path conversion unit configured to reflect or refract light incident along the first optical axis in the direction of a second optical axis intersecting the first optical axis; a second optical path conversion unit configured to reflect or refract light incident along the second optical axis in the direction of a third optical axis, wherein the third optical axis intersects the first optical axis and the second optical axis respectively; and an optical imaging system disposed between the first optical path conversion unit and the second optical path conversion unit.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10 - 2020 - 0059949, filed with the Korean Intellectual Property Office on May 19, 2020, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] The following description relates to a camera module for telephoto imaging. Background art

[0004] A camera module may be mounted on a portable terminal. In an example, the camera module may be mounted on the corresponding front and rear surfaces of a wireless communication terminal. Since the camera module of the portable terminal can be easily used and carried, the camera module can be used not only for imaging short - distance objects but also for imaging remote or long - distance objects. Therefore, it may be beneficial for the camera module of the portable terminal to have a telephoto function comparable to that of a normal camera. However, since the space for mounting the camera module may be limited based on the size of the wireless terminal, it may be difficult to implement or execute the telephoto function. Therefore, it may be beneficial to develop an optical imaging system and a camera module that achieve telephoto performance without increasing the size of the wireless terminal.

[0005] The above information is presented only as background information to aid in understanding the present disclosure. No determination has been made, nor is any assertion made, as to whether any of the above constitutes prior art with respect to the present disclosure. Summary of the invention

[0006] The Summary of the Invention section is intended to introduce, in brief form, a selection of inventive concepts that will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0007] In general aspects, the camera module includes: a first optical path conversion unit configured to reflect or refract light incident along a first optical axis in a direction of a second optical axis intersecting the first optical axis; a second optical path conversion unit configured to reflect or refract light incident along the second optical axis in a direction of a third optical axis, wherein the third optical axis intersects the first optical axis and the second optical axis respectively; and an optical imaging system disposed between the first optical path conversion unit and the second optical path conversion unit.

[0008] The optical imaging system may satisfy the conditional expression 0.5 < BFL / f, where BFL is the distance from the image side of the lens closest to the imaging surface in the optical imaging system to the imaging surface, and f is the focal length of the optical imaging system.

[0009] The optical imaging system may include a first lens, a second lens, and a third lens sequentially arranged from the object side to the imaging side.

[0010] The first lens may have a positive refractive power, the second lens has a negative refractive power, and the third lens has a positive refractive power.

[0011] The optical imaging system may include a fourth lens and a fifth lens having refractive powers.

[0012] The optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from the object side to the imaging side.

[0013] The first lens may have a positive refractive power, the second lens may have a negative refractive power, the third lens may have a negative refractive power, and the fourth lens has a positive refractive power.

[0014] The focal length (f) of the optical imaging system may be equal to or greater than 19 mm.

[0015] The distance from the first intersection of the first optical axis and the second optical axis to the second intersection of the second optical axis and the third optical axis may be greater than the focal length (f) of the optical imaging system.

[0016] In general, the camera module includes: a first optical path conversion unit and a second optical path conversion unit, each of the first optical path conversion unit and the second optical path conversion unit configured to change the optical path; and an optical imaging system disposed between the first optical path conversion unit and the second optical path conversion unit, the optical imaging system including one or more lens groups, wherein the optical imaging system satisfies the conditional expression 4.0 < BFL / ImgHT, where BFL is the distance from the image side of the lens closest to the imaging surface to the imaging surface, and ImgHT is the height of the imaging surface.

[0017] One or more lens groups may include a first lens, a second lens, and a third lens sequentially arranged from the object side to the imaging side.

[0018] The first lens may have a positive refractive power.

[0019] The third lens may have a shape with a convex object side and a concave image side.

[0020] One or more lens groups may include a fourth lens having a refractive power.

[0021] One or more lens groups may include a fifth lens having a refractive power.

[0022] BFL may be equal to or greater than 15 mm.

[0023] In general, a terminal device includes a camera module and an optical imaging system, the camera module includes a first reflecting member and a second reflecting member, each of the first reflecting member and the second reflecting member is respectively configured to change an optical path, the optical imaging system includes: a first lens including a positive refractive power; a second lens including a negative refractive power; and a third lens including a convex object-side surface and a concave image-side surface, wherein a focal length of the optical imaging system is equal to or greater than 19 mm.

[0024] The back focal length (BFL) of the optical imaging system may be equal to or greater than 15 mm.

[0025] The focal length of the first lens may be in the range of 8.0 mm to 25.0 mm.

[0026] The first lens, the second lens, and the third lens may be disposed between the first reflecting member and the second reflecting member.

[0027] In a general aspect, a camera module includes: a first lens including a positive refractive power; a second lens including a negative refractive power; a third lens including a refractive power; a fourth lens; a fifth lens; a first reflecting member, disposed on the object side of the first lens and configured to change the first optical path; a second reflecting member, disposed on the image side of the fifth lens and configured to change the second optical path; and a third reflecting member, disposed adjacent to the second reflecting member and configured to change the third optical path, wherein the first lens to the fifth lens are disposed in sequence from the object side toward the image side.

[0028] The second lens may have a focal length in the range of -50.0 mm to -6.0 mm.

[0029] The refractive index of the third lens may be equal to or greater than 1.65.

[0030] The first lens may have a convex object-side surface.

[0031] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 An example camera module is shown in accordance with one or more implementations.

[0033] Figure 2 An example camera module is shown in accordance with one or more implementations.

[0034] Figure 3 An example optical imaging system is shown in accordance with one or more implementations.

[0035] Figure 4 Shows Figure 3Example aberration curves for the example optical imaging system shown in .

[0036] Figure 5 An example optical imaging system is shown in accordance with one or more implementations.

[0037] Figure 6 Shows Figure 5 Example aberration curves for the example optical imaging system shown in .

[0038] Figure 7 An example optical imaging system is shown in accordance with one or more implementations.

[0039] Figure 8 Shows Figure 7 Example aberration curves for the example optical imaging system shown in .

[0040] Fig. 9 An example optical imaging system is shown in accordance with one or more implementations.

[0041] Fig.10 Shows Fig. 9 Aberration curves for the example optical imaging system shown in .

[0042] Fig.11 An example optical imaging system is shown in accordance with one or more implementations.

[0043] Fig.12 Shows Fig.11 Example aberration curves for the example optical imaging system shown in .

[0044] Figures 13 to 15 An example rear view of a portable terminal having a camera module according to one or more embodiments is shown.

[0045] Throughout the drawings and detailed description, unless otherwise described or provided, the same reference numerals will be understood to refer to the same elements, features and structures. For the purposes of clarity, illustration and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions and depictions of the elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0046] The following detailed description is provided to help the reader obtain a comprehensive understanding of the method, device and / or system described in this application. However, after understanding the disclosure of this application, various changes, modifications and equivalences of the method, device and / or system described in this application will be apparent. For example, the order of operations described in this application is merely an example, and except for the operations that must occur in a specific order, it is not limited to the order set forth in this application, but can make obvious changes after understanding the disclosure of this application. In addition, for greater clarity and brevity, the description of features well known in the art may be omitted.

[0047] The features described in this application can be implemented in different forms and should not be understood as being limited to the examples described in this application. Rather, the examples described in this application have been provided so that this disclosure will be thorough and complete and the scope of this disclosure will be fully conveyed to those of ordinary skill in the art.

[0048] It should be noted that in the present application, the use of the word "may" with respect to an embodiment or example, for example, regarding what an embodiment or example may include or implement, means that there is at least one embodiment or example that includes or implements such features, and all embodiments and examples are not limited thereto.

[0049] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there may be no other elements between the element and the other element.

[0050] As used in this application, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0051] Although the terms "first", "second" and "third" may be used in this application to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. More specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described in this application, the first member, first component, first region, first layer or first part mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second part.

[0052] Spatially relative terms such as "above", "higher", "below", and "lower" may be used in this application for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both "above" and "below" orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used in this application should be interpreted accordingly.

[0053] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include plural forms as well. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0054] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in the present application are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0055] The features of the examples described in this application can be combined in various ways that will be apparent after understanding the disclosure of this application. In addition, although the examples described in this application have multiple configurations, other configurations that will be apparent after understanding the disclosure of this application are also possible.

[0056] In addition, in the examples in the present application, the first lens represents the lens closest to the object (or subject), and the fifth lens represents the lens closest to the imaging surface (or image sensor). In the examples in the present application, the radius of curvature, thickness, TTL, ImgHT (height of the imaging surface: 1 / 2 of the diagonal length of the imaging surface) and focal length of the lens are all in mm. In the examples in the present application, FOV (field of view angle of the optical imaging system) is in degrees. In addition, the thickness of the lens, the distance between the lenses, TTL, BFL, distance, etc. are numerical values ​​calculated based on the optical axis of the optical imaging system. In addition, in the description of the shape of the lens, the statement that a surface has a convex shape indicates that the optical axis portion of the surface is convex, and the statement that a surface has a concave shape indicates that the optical axis portion of the surface is concave. Therefore, even when a surface of the lens is described as convex, the edge portion of the lens can also be concave. Similarly, even when a surface of the lens is described as concave, the edge portion of the lens can also be convex.

[0057] The camera module according to the example is configured to be mounted on a thin portable terminal or a portable device having a slim form factor. In the example, the height of one side of the camera module may be less than the thickness of the portable terminal. The camera module is configured to have a relatively long focal length. For example, the distance from the frontmost lens of the camera module to the imaging surface of the image sensor may be greater than the thickness of the portable terminal.

[0058] The camera module is configured to have a refractive optical path. Specifically, the camera module can be configured so that three non-parallel optical paths are formed. For example, a first optical path, a second optical path, and a third optical path can be formed inside the camera module. The first optical path can represent the path of light incident on the camera module along the first optical axis. For example, the first optical path can be the path of light along which light reflected from an imaging object moves to the camera module. The second optical path can represent the path of light moving on the second optical axis. For example, the second optical path can be the path of light moving along the optical axis of an optical imaging system disposed inside the camera module. The third optical path can represent the path of light moving on the third optical axis. For example, the third optical path can be the path along which light emitted from an optical imaging system moves to an imaging surface. The optical paths or optical axes of the camera module can be configured to intersect. For example, the first optical path (first optical axis) can be configured to intersect with the second optical path (second optical axis), and the second optical path (second optical axis) can be configured to intersect with the third optical path (third optical axis). In addition, the first optical path (first optical axis) can be configured to intersect with the third optical path (third optical axis). Thus, as a non-limiting example, a camera module according to the example may include three optical paths or optical axes that are not parallel to each other. The intersection of the optical paths or optical axes may have a predetermined relationship with the focal length of the optical imaging system. For example, the distance from the first intersection to the second intersection may be greater than the focal length of the optical imaging system, wherein the first optical path (first optical axis) and the second optical path (second optical axis) intersect at the first intersection, and the second optical path (second optical axis) and the third optical path (third optical axis) intersect at the second intersection.

[0059] The camera module may include a plurality of optical path conversion units or reflecting members. For example, the camera module may include a first optical path conversion unit and a second optical path conversion unit. However, the number of optical path conversion units constituting the camera module is not limited to two here. For example, the camera module may include three optical path conversion units. The first optical path conversion unit and the second optical path conversion unit may be respectively arranged in the front position and the rear position of the camera module. For example, the first optical path conversion unit may be arranged to be closest to the object side, and the second optical path conversion unit may be arranged to be closest to the imaging surface of the image sensor. The first optical path conversion unit and the second optical path conversion unit are configured to change the path of the light incident to the camera module. For example, the first optical path conversion unit is configured to reflect or refract the light incident on or along the first optical axis in the direction of the second optical axis intersecting the first optical axis, and the second optical path conversion unit is configured to reflect or refract the light incident along the second optical axis in the direction of the third optical axis intersecting the first optical axis and the second optical axis. The optical path conversion unit may be one of the members reflecting or refracting the optical path. For example, the optical path conversion unit may be formed in the form of a prism, a reflector, etc. The optical path conversion unit may be disposed at the intersection of the optical paths (optical axes). For example, the first optical path conversion unit may be disposed at the intersection of the first optical path and the second optical path, and the second optical path conversion unit may be disposed at the intersection of the second optical path and the third optical path.

[0060] The camera module includes an optical imaging system. The optical imaging system may be arranged between the first optical path conversion unit and the second optical path conversion unit. The optical imaging system may include one or more lens groups. The lens group may include a plurality of lenses. As an example, the lens group may include a first lens, a second lens, and a third lens arranged in sequence from the object side. However, the number of lenses constituting the lens group is not limited to three. In an example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side. As another example, the lens group may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side.

[0061] The camera module may include a driving unit for driving the optical imaging system. The driving unit may include a driving magnet and a driving coil. The driving magnet may be disposed in the optical imaging system or in a lens barrel accommodating the optical imaging system. The driving coil may be disposed in a main body of the camera module or in a housing accommodating the lens barrel. The driving unit may move the optical imaging system on the second optical axis. For example, the driving unit may move the optical imaging system toward the object side or the imaging side, so that the focal length of the camera module may be adjusted.

[0062] Next, an optical imaging system constituting the camera module will be described in detail.

[0063] The optical imaging system according to the example includes an optical system composed of a plurality of lenses. In the example, the optical system of the optical imaging system may include a plurality of lenses having a refractive power. However, the optical imaging system does not have to include only lenses having a refractive power. For example, the optical imaging system may include a prism for refracting incident light and an aperture for adjusting the amount of light. In addition, the optical imaging system may include an infrared cutoff filter for blocking infrared light. In addition, the optical imaging system may also include an image sensor that converts an image of an object incident through the optical system into an electrical signal. In addition, the optical imaging system may also include a spacing maintaining member for adjusting the distance between lenses.

[0064] The plurality of lenses may be formed of a material having a refractive index different from that of air. In an example, the plurality of lenses may be formed of plastic or glass. At least one lens of the plurality of lenses has an aspherical shape. The aspherical surface of the lens is represented by the following equation 1.

[0065] Equation 1:

[0066]

[0067] In Equation 1, c is the inverse of the radius of curvature of the lens, K is the cone constant, r is the distance from any point on the aspherical surface to the optical axis, A to J are aspherical constants, and Z (or SAG) is the distance from any point on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis.

[0068] The optical imaging system may include three or more lenses. In an example, the optical imaging system may include a first lens, a second lens, and a third lens arranged in sequence from the object side. However, the number of lenses constituting the optical imaging system is not limited to three here. For example, as a non-limiting example, the optical imaging system may include four lenses or five lenses as described above.

[0069] The first to third lenses, the first to fourth lenses, and the first to fifth lenses may be arranged spaced apart from adjacent lenses. For example, a predetermined interval may be formed between the image side surface of a lens and the object side surface of a lens adjacent thereto.

[0070] The first lens may have a predetermined degree of refractive power. For example, the first lens may have a positive refractive power. The first lens may have a shape with a convex surface. In an example, the first lens may have a convex object side surface. The first lens may have a predetermined refractive index. For example, the first lens may have a refractive index less than 1.6. The first lens may have a predetermined focal length. In an example, the focal length of the first lens may be determined to be in the range of 8.0 mm to 25.0 mm.

[0071] The second lens may have a predetermined degree of refractive power. For example, the second lens may have a negative refractive power. The second lens may have a shape with a concave surface. For example, the second lens may have a concave image side surface. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be greater than or equal to 1.6. The second lens has a predetermined focal length. For example, the focal length of the second lens may be determined to be within a range of -50.0 mm to -6.0 mm.

[0072] The third lens may have a predetermined degree of refractive power. For example, the third lens may have positive refractive power or negative refractive power. The third lens may have a shape with a convex surface. For example, the third lens may have a convex object side surface. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.65 or greater. In addition, the refractive index of the third lens may be greater than the refractive index of the other lenses constituting the optical imaging system. The third lens may have a predetermined focal length. In the example, the focal length of the third lens may be selected to be less than -100 mm, or to be 16 mm or greater.

[0073] The optical imaging system may further include a fourth lens and a fifth lens, which may be optionally included. The fourth lens and the fifth lens may include the following features.

[0074] The fourth lens may have a predetermined degree of refractive power. For example, the fourth lens may have a positive refractive power or a negative refractive power. The fourth lens may have a shape with one surface convex. For example, the fourth lens may have a convex object-side surface or a convex image-side surface. The fourth lens has a predetermined refractive index. In an example, the fourth lens may have a refractive index equal to or greater than 1.6. The fourth lens may have a predetermined focal length. For example, the focal length of the fourth lens may be less than -10 mm, or may be equal to or greater than 40 mm.

[0075] The fifth lens may have a predetermined degree of refractive power. For example, the fifth lens may have a positive refractive power or a negative refractive power. The fifth lens may have a shape with a convex surface. For example, the fifth lens may have a convex object side surface or a convex image side surface. The fifth lens may have a predetermined refractive index. In an example, the fifth lens may have a refractive index less than 1.6. The fifth lens may have a predetermined focal length. For example, the focal length of the fifth lens may be selected to be less than -200 mm, or selected to be greater than or equal to 30 mm.

[0076] The optical imaging system includes a lens formed of a plastic material. For example, in an example of the optical imaging system, at least one lens of five or more lenses constituting a lens group may be formed of a plastic material. The optical imaging system includes an aspheric lens. For example, in the optical imaging system, at least one lens of five or more lenses constituting a lens group may be an aspheric lens.

[0077] The optical imaging system may include a filter, an aperture, and an image sensor. The filter may be disposed between the image sensor and a lens disposed closest to the imaging surface. The filter blocks some wavelengths in the incident light to improve the resolution of the optical imaging system. For example, the filter may block infrared wavelengths of the incident light. The optical imaging system may have predetermined optical properties. For example, the F number of the optical imaging system may be equal to or greater than 2.8. As another example, the focal length of the optical imaging system may be equal to or greater than 19 mm. As another example, the distance BFL from the image side surface of the lens disposed closest to the imaging surface in the lens of the optical imaging system to the imaging surface of the image sensor may be equal to or greater than 15 mm.

[0078] The optical imaging system may satisfy one or more of the following conditional expressions.

[0079] 0.5 <BFL / TTL

[0080] 3.2 <n2+n3

[0081] 0≤D12 / f≤0.07

[0082] 0.8≤EL1S2 / EL1S1≤1.01

[0083] 0.8≤TTL / f≤1.25

[0084] 3.5≤TTL / ImgHT

[0085] 0.2≤R1 / f≤0.6

[0086] In the above conditional expressions, BFL is the distance from the image side surface of the lens disposed closest to the imaging surface of the image sensor to the imaging surface, TTL is the distance from the object side surface of the lens disposed closest to the object (first lens) to the imaging surface, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, D12 is the distance from the image side surface of the first lens to the object side surface of the second lens, f is the focal length of the optical imaging system, and EL1S1 is the effective radius of the object side surface of the first lens, EL1S2 is the effective radius of the image side surface of the first lens, ImgHT is the height of the imaging surface (1 / 2 of the diagonal length of the imaging surface), and R1 is the radius of curvature of the object side surface of the first lens.

[0087] The optical imaging system may also satisfy one or more of the following conditional expressions.

[0088] 0.5 <BFL / f

[0089] 4.0 <BFL / ImgHT

[0090] 0.8 <P1P2 / f<2.0

[0091] 0.9 <P1Le / BFL<2.0

[0092] 2.1 <f / ImgHT

[0093] DT13 / f<0.27

[0094] 4.2 <BFL / T1

[0095] 0.2<(PTTL-TTL) / BFL<0.8

[0096] In the above conditional expressions, P1P2 is the distance from the intersection of the first optical axis and the second optical axis (first intersection) to the intersection of the second optical axis and the third optical axis (second intersection), P1Le is the distance from the image side surface of the lens arranged closest to the imaging surface of the image sensor to the first intersection, DT13 is the distance from the object side surface of the first lens to the object side surface of the third lens, T1 is the thickness of the first lens at its center along the optical axis, and PTTL is the distance from the first intersection to the imaging surface.

[0097] The following will refer to Figure 1 A camera module according to an example is described.

[0098] The camera module 10 may include a plurality of optical path conversion units P1 and P2, an optical imaging system 100, a filter IF, and an image sensor IP. The camera module 10 may further include a driving unit. In an example, the camera module 10 may further include a driving unit that moves the optical imaging system 100 in the optical axis direction. The driving unit may be in the form of a magnet and a coil. However, the configuration of the driving unit is not limited to a magnet and a coil. In an example, within the range in which the optical imaging system 100 can move, the driving unit may be changed to have other forms, such as but not limited to shape memory alloys, piezoelectric elements, and the like.

[0099] The optical path conversion units P1 and P2 are configured to convert the optical path of light reflected from an object. In an example, the first optical path conversion unit P1 can convert light incident along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, and the second optical path conversion unit P2 can convert light incident along the second optical axis C2 in the direction of the third optical axis C3 intersecting the second optical axis C2. The first optical path conversion unit P1 and the second optical path conversion unit P2 are configured to convert optical paths in different directions.

[0100] In an example, the optical path converted by the first optical path conversion unit P1 (in the second optical axis C2 direction) can be formed to intersect with the optical path converted by the second optical path conversion unit P2 (in the third optical axis C3 direction). In addition, the optical path converted by the second optical path conversion unit P2, for example, in the optical axis C3 direction (in the third optical axis direction) can be formed to intersect with the optical path of the light incident on the first optical path conversion unit P1, for example, in the optical axis C1 direction (in the first optical axis direction). The optical path conversion units P1 and P2 can be respectively arranged on the front and rear of the optical imaging system 100.

[0101] In an example, the first optical path conversion unit P1 may be disposed in front of the frontmost lens 110 of the optical imaging system 100 , and the second optical path conversion unit P2 may be disposed behind the rearmost lens 150 of the optical imaging system 100 .

[0102] The optical imaging system 100 is configured to form an image of light reflected from an object on an imaging surface of the image sensor IP. For example, the optical imaging system 100 may form an image of light incident into the camera module 10 through a lens having a refractive power on the image sensor IP. The optical imaging system 100 may include a plurality of lenses. For example, the optical imaging system 100 may include three or more lenses. The optical imaging system 100 may have a back focal length (BFL) of an extended length. In an example, the BFL of the optical imaging system 100 may be equal to or greater than 15 mm.

[0103] As an example, in Figure 1 , BFL is the sum of the distance from the image side surface of the rearmost lens 150 to the intersection of the second optical axis C2 and the third optical axis C3 and the distance from the intersection of the second optical axis C2 and the third optical axis C3 to the imaging surface of the image sensor IP. The optical imaging system 100 may be disposed behind the first optical path conversion unit P1. However, the arrangement position of the optical imaging system 100 is not limited to the rear (or image side) of the first optical path conversion unit P1. In a non-limiting example, a portion of the lenses constituting the optical imaging system 100 may be disposed in front of the first optical path conversion unit P1 (or on the object side).

[0104] The filter IF may be configured to block wavelengths of light that inhibit the resolution of the camera module 10. For example, the filter IF may be configured to block light having an infrared wavelength from being incident on the image sensor IP. The filter IF may be disposed between the rearmost lens 150 and the image sensor IP of the optical imaging system 100. In a non-limiting example, the filter IF may be disposed between the rearmost lens 150 and the second optical path conversion unit P2, or between the second optical path conversion unit P2 and the image sensor IP. Alternatively, the filter IF may be integrally formed on the incident surface or the exit surface of the second optical path conversion unit P2. As another example, the filter IF may be integrally formed on one surface of the image sensor IP. However, the filter IF may not necessarily be included in the camera module 10. For example, depending on the type of the camera module 10, the filter IF may be omitted.

[0105] The image sensor IP is configured to convert an optical signal into an electrical signal. For example, the image sensor IP may have a form including a plurality of optical elements, and may be configured, for example, in a CMOS form.

[0106] The camera module 10 configured as described above may have an extended focal length. For example, the focal length of the camera module 10 may be equal to or greater than 19 mm. The camera module 10 according to the example may clearly image an object located at a relatively long distance from the camera module.

[0107] Will refer to Figure 2 A camera module according to another example is described.

[0108] The camera module 12 may include a plurality of optical path conversion units P1, P2 and P3, an optical imaging system 100, an optical filter IF and an image sensor IP. The camera module 12 may also include a driving unit. In an example, the camera module 12 may also include a driving unit for moving the optical imaging system 100 in the optical axis direction. The driving unit may be configured to have a form including a magnet and a coil. However, the configuration of the driving unit is not limited to a magnet and a coil. For example, within the range in which the optical imaging system 100 can move, the driving unit may be changed to have other forms, such as but not limited to shape memory alloys, piezoelectric elements, and the like.

[0109] The optical path conversion units P1, P2, and P3 may be configured to convert an optical path of light reflected from an object. In an example, the first optical path conversion unit P1 may convert light incident along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, the second optical path conversion unit P2 may convert light incident along the second optical axis C2 in the direction of the third optical axis C3 intersecting the second optical axis C2, and the third optical path conversion unit P3 may convert light incident along the third optical axis C3 in the direction of the fourth optical axis C4 intersecting the third optical axis C3. The first optical path conversion unit P1, the second optical path conversion unit P2, and the third optical path conversion unit P3 are configured to convert optical paths in different directions.

[0110] In the example, the optical path (the second optical axis C2 direction) converted by the first optical path conversion unit P1 can be formed to intersect with the optical path converted by the second optical path conversion unit P2, for example, in the optical axis C3 direction (the third optical axis direction). In addition, the optical path converted by the second optical path conversion unit P2, for example, in the optical axis C3 direction (the third optical axis direction) can be formed in a form that intersects with the optical path incident on the first optical path conversion unit P1, for example, in the optical axis C1 direction (the first optical axis direction). The third optical path conversion unit P3 can be configured to form an optical path parallel to the optical path converted by the first optical path conversion unit P1, for example, in the optical axis C2 direction (the second optical axis direction), for example, in the optical axis C4 direction (the fourth optical axis direction). In the example, the optical path converted by the third optical path conversion unit P3, for example, in the optical axis C4 direction (the fourth optical axis direction) can be substantially parallel to the optical path converted by the first optical path conversion unit P1, for example, in the optical axis C2 direction (the second optical axis direction). The optical path conversion units P1, P2, and P3 may be respectively disposed in front of the optical imaging system 100 and behind the optical imaging system 100. For example, the first optical path conversion unit P1 may be disposed in front of the frontmost lens 110 of the optical imaging system 100, and the second optical path conversion unit P2 and the third optical path conversion unit P3 may be disposed behind the rearmost lens 150 of the optical imaging system 100.

[0111] The optical imaging system 100 is configured to form an image of light reflected from an object on an imaging surface of the image sensor IP. In an example, the optical imaging system 100 may form an image of light incident into the camera module 12 through a lens having a refractive power on the image sensor IP. The optical imaging system 100 may include a plurality of lenses. For example, the optical imaging system 100 may include three or more lenses. The optical imaging system 100 may have a back focal length (BFL) of an extended length. For example, the BFL of the optical imaging system 100 may be equal to or greater than 15 mm.

[0112] For example, in Figure 2, BFL is the sum of the distance from the image side surface of the rearmost lens 150 to the intersection of the second optical axis C2 and the third optical axis C3, the distance from the intersection of the second optical axis C2 and the third optical axis C3 to the intersection of the third optical axis C3 and the fourth optical axis C4, and the distance from the intersection of the third optical axis C3 and the fourth optical axis C4 to the imaging surface of the image sensor IP. The optical imaging system 100 can be disposed behind the first optical path conversion unit P1. However, the arrangement position of the optical imaging system 100 is not limited to the rear (image side) of the first optical path conversion unit P1. In the example, a portion of the lenses constituting the optical imaging system 100 can be disposed in front of the first optical path conversion unit P1, that is, on the object side of the first optical path conversion unit P1.

[0113] The filter IF may be configured to block wavelengths of light that inhibit the resolution of the camera module 12. For example, the filter IF may be configured to block light having an infrared wavelength from being incident on the image sensor IP. The filter IF may be disposed between the rearmost lens 150 and the image sensor IP of the optical imaging system 100. In a non-limiting example, the filter IF may be disposed between the rearmost lens 150 and the second optical path conversion unit P2, or between the second optical path conversion unit P2 and the image sensor IP. Alternatively, the filter IF may be integrally formed on the incident surface or the exit surface of the second optical path conversion unit P2.

[0114] refer to Figure 2 In another example, the filter IF may be disposed between the third optical path conversion unit P3 and the image sensor IP. As another example, the filter IF may be integrally formed on one surface of the image sensor IP. However, the filter IF may not necessarily be included in the camera module 12. In an example, the filter IF may be omitted depending on the type of the camera module 12.

[0115] The image sensor IP is configured to convert an optical signal into an electrical signal. In an example, the image sensor IP may have a form including a plurality of optical elements and may be configured in a CMOS form.

[0116] The camera module 12 configured as described above may have a long focal length. For example, the focal length of the camera module 12 may be greater than or equal to 19 mm. The camera module 12 according to this example may clearly image an object located at a relatively long distance from the camera module 12.

[0117] Next, various forms of optical imaging systems constituting the camera module will be described.

[0118] First, refer to Figure 3 An optical imaging system according to a first example is described.

[0119] The optical imaging system 100 includes a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , and a fifth lens 150 .

[0120] The first lens 110 has positive refractive power. The first lens 110 has a convex object-side surface and a convex image-side surface. The second lens 120 has negative refractive power. The second lens 120 has a flat object-side surface and a concave image-side surface. The third lens 130 has positive refractive power. The third lens 130 has a convex object-side surface and a concave image-side surface. The fourth lens 140 has negative refractive power. The fourth lens 140 has a convex object-side surface and a concave image-side surface. The fifth lens 150 has positive refractive power. The fifth lens 150 has a convex object-side surface and a concave image-side surface.

[0121] The optical imaging system 100 includes a filter IF and an image sensor IP. The filter IF is disposed in front of the image sensor IP and blocks infrared rays and the like included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface on which an image of light incident through the first lens 110 to the fifth lens 150 may be formed.

[0122] The optical imaging system 100 may be disposed between the optical path conversion units P1 and P2. For example, some lenses (the first lens 110 to the fifth lens 150) of the optical imaging system 100 may be disposed between the first optical path conversion unit P1 and the second optical path conversion unit P2.

[0123] Table 1 shows lens characteristics of the optical imaging system 100 according to this example, and Table 2 shows aspheric surface values ​​of the optical imaging system 100 according to this example. Figure 4 ] are aberration curves of the optical imaging system 100 configured as described above.

[0124] Table 1

[0125]

[0126] Table 2

[0127] Face number K A B C D S5 -6.8560E-01 3.2923E-05 -1.4960E-07 -3.6045E-09 -7.2078E-11 S6 -2.2664E+00 9.3697E-05 -5.6890E-07 -1.1178E-08 -2.9730E-10 S7 0.0000E+00 -1.8235E-04 3.7153E-06 -1.8196E-08 -2.6087E-10 S8 7.1908E-02 -4.0643E-04 8.7645E-07 -7.6931E-08 3.7457E-09 S9 6.6624E-02 -3.4314E-04 6.0040E-06 -5.6471E-08 -1.3302E-09 S10 -3.9170E+00 -3.7672E-04 9.6172E-06 -1.7071E-07 -5.2749E-10 S11 3.4965E+00 -3.2773E-04 -1.7493E-06 2.7021E-07 -1.4153E-08 S12 -9.7030E-02 -7.4890E-04 1.0657E-05 7.9532E-07 2.8211E-08 S13 -7.0889E-01 -6.6756E-04 5.2247E-06 4.9932E-07 2.1551E-08 S14 -1.0569E+01 -4.7328E-04 -3.0750E-06 1.3530E-07 1.1652E-08 Face number E F G H J S5 -4.5249E-12 2.5488E-14 -1.1182E-15 -6.9351E-17 -1.5714E-18 S6 -7.7777E-12 -3.1870E-13 -5.8554E-15 -8.4695E-17 6.1814E-18 S7 -1.6655E-11 -2.9717E-13 -2.3168E-15 2.4692E-17 6.1489E-18 S8 -5.1179E-11 -2.9616E-12 -3.6675E-14 -1.4140E-15 -6.2653E-17 S9 9.4807E-11 2.5486E-14 -7.1800E-14 -1.6552E-14 1.6964E-16 S10 -1.1509E-10 -1.9832E-11 -8.8397E-13 2.5981E-15 8.7574E-16 S11 -1.9853E-10 -2.6360E-11 -1.0944E-12 9.9003E-15 1.8211E-15 S12 -4.2341E-09 -4.8315E-12 2.5693E-12 1.3739E-13 -3.3511E-15 S13 5.2141E-10 -9.6339E-11 -4.5370E-13 -2.0918E-12 2.0070E-13 S14 -5.5284E-10 -5.7823E-10 5.9639E-11 5.9679E-13 -1.1348E-13

[0128] Will refer to Figure 5 An optical imaging system 200 according to a second example is described.

[0129] like Figure 5 As shown in , the optical imaging system 200 includes a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 and a fifth lens 250 .

[0130] The first lens 210 has positive refractive power. The first lens 210 has a convex object side surface and a convex image side surface. The second lens 220 has negative refractive power. The second lens 220 has a shape in which the object side surface is concave and the image side surface is concave. The third lens 230 has positive refractive power. The third lens 230 has a convex object side surface and a concave image side surface. The fourth lens 240 has negative refractive power. The fourth lens 240 has a convex object side surface and a concave image side surface. The fifth lens 250 has positive refractive power. The fifth lens 250 has a convex object side surface and a convex image side surface.

[0131] The optical imaging system 200 includes a filter IF and an image sensor IP. The filter IF is disposed in front of the image sensor IP and blocks infrared rays, etc., included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface on which an image of light incident through the first lens 210 to the fifth lens 250 may be formed.

[0132] The optical imaging system 200 may be disposed between the optical path conversion units P1 and P2. For example, some lenses (the first lens 210 to the fifth lens 250) of the optical imaging system 200 may be disposed between the first optical path conversion unit P1 and the second optical path conversion unit P2.

[0133] Table 3 shows lens characteristics of the optical imaging system 200 according to this example, and Table 4 shows aspheric surface values ​​of the optical imaging system 200 according to this example. Figure 6 ] are aberration curves of the optical imaging system 200 configured as described above.

[0134] Table 3

[0135]

[0136] Table 4

[0137]

[0138]

[0139] Will refer to Figure 7 An optical imaging system 300 according to a third example is described.

[0140] The optical imaging system 300 includes a first lens 310 , a second lens 320 , and a third lens 330 .

[0141] The first lens 310 has positive refractive power. The first lens 310 has a convex object-side surface and a concave image-side surface. The second lens 320 has negative refractive power. The second lens 320 has a convex object-side surface and a concave image-side surface. The third lens 330 has positive refractive power. The third lens 330 has a convex object-side surface and a concave image-side surface.

[0142] The optical imaging system 300 includes a filter IF and an image sensor IP. The filter IF is disposed in front of the image sensor IP and blocks infrared rays included in the incident light. The image sensor IP includes a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP can provide an imaging surface on which an image of light incident through the first lens 310 to the third lens 330 can be formed.

[0143] The optical imaging system 300 may be disposed between the optical path conversion units P1 and P2. For example, some lenses (the first lens 310 to the third lens 330) of the optical imaging system 300 may be disposed between the first optical path conversion unit P1 and the second optical path conversion unit P2.

[0144] Table 5 shows lens characteristics of the optical imaging system 300 according to this example, and Table 6 shows aspheric surface values ​​of the optical imaging system 300 according to this example. Figure 8 ] are aberration curves of the optical imaging system 300 configured as described above.

[0145] Table 5

[0146]

[0147]

[0148] Table 6

[0149] Face number K A B C D S5 9.2974E-02 -1.9922E-04 1.6594E-04 -1.0951E-04 3.5054E-05 S6 -9.9000E+01 -5.6901E-03 1.5430E-02 -1.4784E-02 7.9711E-03 S7 3.8621E+01 -1.4387E-02 1.8558E-02 -1.6739E-02 9.2665E-03 S8 2.1047E-01 -1.2439E-02 5.0135E-03 -3.7128E-03 2.6715E-03 S9 -6.7684E-01 -7.8204E-04 -2.7484E-05 2.9992E-05 8.9822E-05 S10 8.9150E+00 -1.0430E-03 9.0012E-05 -2.9192E-04 2.4618E-04 Face number E F G H J S5 -6.6059E-06 6.7421E-07 -2.8101E-08 -3.7526E-10 4.6251E-11 S6 -2.6009E-03 5.1989E-04 -6.1986E-05 4.0376E-06 -1.1040E-07 S7 -3.1334E-03 6.4905E-04 -8.0251E-05 5.4291E-06 -1.5444E-07 S8 -1.1985E-03 3.3051E-04 -5.5481E-05 5.1871E-06 -2.0584E-07 S9 -5.7847E-05 2.7425E-05 -7.8515E-06 1.0976E-06 -5.8071E-08 S10 -1.1247E-04 4.5396E-05 -1.2890E-05 1.9130E-06 -1.1014E-07

[0150] Will refer to Fig. 9 An optical imaging system 400 according to a fourth example is described.

[0151] The optical imaging system 400 includes a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , and a fifth lens 450 .

[0152] The first lens 410 has positive refractive power. The first lens 410 has a convex object-side surface and a convex image-side surface. The second lens 420 has negative refractive power. The second lens 420 has a convex object-side surface and a concave image-side surface. The third lens 430 has negative refractive power. The third lens 430 has a convex object-side surface and a concave image-side surface. The fourth lens 440 has positive refractive power. The fourth lens 440 has a concave object-side surface and a convex image-side surface. The fifth lens 450 has negative refractive power. The fifth lens 450 has a concave object-side surface and a convex image-side surface.

[0153] The optical imaging system 400 includes a filter IF and an image sensor IP. The filter IF is disposed in front of the image sensor IP and blocks infrared rays included in the incident light. The image sensor IP includes a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP can form an imaging surface on which an image of light incident through the first lens 410 to the fifth lens 450 can be formed.

[0154] The optical imaging system 400 may be disposed between the optical path conversion units. For example, some lenses (the first lens 410 to the fifth lens 450) of the optical imaging system 400 may be disposed between the first optical path conversion unit P1 and the second optical path conversion unit P2.

[0155] Table 7 shows lens characteristics of the optical imaging system 400 according to this example, and Table 8 shows aspheric surface values ​​of the optical imaging system 400 according to this example. Fig.10 ] are aberration curves of the optical imaging system 400 configured as described above.

[0156] Table 7

[0157]

[0158] Table 8

[0159]

[0160]

[0161] Will refer to Fig.11 An optical imaging system 500 according to a fifth example is described.

[0162] The optical imaging system 500 includes a first lens 510 , a second lens 520 , a third lens 530 , and a fourth lens 540 .

[0163] The first lens 510 has positive refractive power. The first lens 510 has a convex object-side surface and a convex image-side surface. The second lens 520 has negative refractive power. The second lens 520 has a convex object-side surface and a concave image-side surface. The third lens 530 has negative refractive power. The third lens 530 has a convex object-side surface and a concave image-side surface. The fourth lens 540 has positive refractive power. The fourth lens 540 has a convex object-side surface and a convex image-side surface.

[0164] The optical imaging system 500 includes a filter IF and an image sensor IP. The filter IF is disposed in front of the image sensor IP and blocks infrared rays included in the incident light. The image sensor IP includes a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP can form an imaging surface on which an image of light incident through the first lens 510 to the fourth lens 540 can be formed.

[0165] The optical imaging system 500 may be disposed between the optical path conversion units P1 and P2. For example, some lenses (the first lens 510 to the fourth lens 540) of the optical imaging system 500 may be disposed between the first optical path conversion unit P1 and the second optical path conversion unit P2.

[0166] Table 9 shows lens characteristics of the optical imaging system 500 according to this example, and Table 10 shows aspheric surface values ​​of the optical imaging system 500 according to this example. Fig.12 ] are aberration curves of the optical imaging system 500 configured as described above.

[0167] Table 9

[0168]

[0169] Table 10

[0170] Face number K A B C D S5 -5.5411E-01 1.4391E-05 -1.4583E-09 4.4686E-10 2.3897E-11 S6 0.0000E+00 2.4373E-05 -4.9908E-08 2.5235E-10 -1.0261E-11 S7 0.0000E+00 -5.0351E-05 4.6441E-07 -2.0817E-09 -3.9684E-11 S8 -6.6252E-02 -1.2426E-04 1.5694E-07 -2.6617E-09 4.7462E-10 S9 0.0000E+00 -9.7554E-05 8.2723E-07 2.4513E-09 -5.0641E-11 S10 -4.8833E+00 -1.1222E-04 1.3556E-06 -1.7363E-08 -3.2615E-10 S11 -6.8685E+00 -2.1020E-04 -4.0907E-07 -1.9156E-08 -2.2606E-09 S12 -6.3308E+01 -1.2463E-04 4.9349E-07 1.6866E-08 -7.2062E-09 Face number E F G H J S5 -7.8102E-13 -1.1673E-13 -5.9715E-15 4.1240E-16 1.3638E-16 S6 8.3994E-13 1.5634E-13 1.4634E-14 5.2184E-16 4.0752E-17 S7 -4.9812E-12 -6.5938E-13 -6.5454E-14 -5.5323E-15 -5.5888E-16 S8 3.4669E-11 1.5162E-12 -2.4294E-14 -8.8442E-15 -9.2681E-16 S9 -7.1688E-11 3.7193E-12 2.9820E-13 2.8519E-14 2.9405E-15 S10 -6.3193E-11 -5.3250E-12 -4.8063E-13 -4.5025E-14 -4.6750E-15 S11 -3.2309E-10 -7.1206E-11 -1.8418E-11 -4.6287E-12 -1.1039E-12 S12 -5.0373E-10 -1.2609E-10 -2.4332E-11 -4.2031E-12 -6.5489E-13

[0171] Table 11 shows optical characteristics of the optical imaging systems according to the first to fifth examples.

[0172] Table 11

[0173] mark First example Second example Third Example Fourth Example Fifth example f 38.000 51.065 19.050 28.865 32.000 f1 14.019 21.121 9.518 11.395 23.412 f2 -12.537 -18.502 -7.331 -11.664 -47.952 f3 18.583 26.238 20.798 -1354.670 -115.724 f4 -13.850 -20.288 - 52.564 53.894 f5 34.328 39.252 - -276.067 - PTTL 51.573 59.896 32.365 38.093 44.714 TTL 36.273 51.546 23.865 29.593 36.214 BFL 19.273 30.396 18.392 18.659 21.214 F-number 3.230 4.250 4.180 4.740 4.620 ImgHT 4.000 4.000 2.290 4.230 2.610 FOV 36.920 24.610 10.050 16.460 8.930 P1P2 41.918 47.877 21.561 28.934 31.116

[0174] Table 12 shows the values ​​of the conditional expressions of the optical imaging systems according to the first to fifth examples. As can be seen from Table 12, the optical imaging systems according to the first to fifth examples satisfy all of the above conditional expressions.

[0175] Table 12

[0176] Conditional Expressions First example Second example Third Example Fourth Example Fifth example BFL / TTL 0.5313 0.5897 0.7707 0.6305 0.5858 n2+n3 3.2995 3.2995 3.2995 3.2995 3.2995 D12 / f 0.0026 0.0021 0.0050 0.0239 0.0031 EL1S2 / EL1S1 0.9542 0.8877 0.8599 1.0000 0.6711 TTL / f 0.9545 1.0094 1.2527 1.0252 1.1317 TTL / ImgHT 9.0682 12.8866 10.4213 6.9960 13.8751 R1 / f 0.2668 0.2985 0.2653 0.2994 0.3993 P1Le / BFL 1.6760 0.9705 1.6344 1.0415 1.8675 P1P2 / f 1.1031 0.9376 1.1318 1.0024 0.9724 f / ImgHT 9.5000 12.7663 8.3188 6.8239 12.2605 DT13 / f 0.2642 0.2504 0.2454 0.2375 0.1929 BFL / T1 4.4527 5.1254 7.2126 4.5111 6.0392 (PTTL-TTL) / BFL 0.7939 0.2747 0.4622 0.4555 0.4007

[0177] Will refer to Figures 13 to 15 A portable terminal having a camera module according to an example is described.

[0178] First, refer to Fig.13 A portable terminal according to an example is described.

[0179] The portable terminal 1000 according to the example may include one or more of the camera modules 10 and 12 described above. The camera modules 10 and 12 may include one of the optical imaging systems 100, 200, 300, 400, and 500 described above. In the example, in addition to the camera modules 10 and 12 according to the example, the portable terminal 1000 may include a different type of camera module 20. The portable terminal 1000 may image a long-distance object through the camera modules 10 and 12, and image a short-distance object through the camera module 20.

[0180] Will refer to Fig.14 A portable terminal according to another example is described.

[0181] The portable terminal 1002 according to the example may include one or more of the camera modules 10 and 12 described above. The camera modules 10 and 12 may include one of the optical imaging systems 100, 200, 300, 400 and 500 described above. The portable terminal 1002 may include a camera module 30 similar in form to the camera modules 10 and 12 according to the example. For example, the camera module 30 may include one or more optical path conversion units. As another example, the camera module 30 may be configured to image a distant object.

[0182] Will refer to Fig.15 A portable terminal according to another example is described.

[0183] A portable terminal 1004 according to another example may include two camera modules 20 and 22 in a form different from the camera modules 10 and 12 according to the example. The camera modules 10 and 12 include one of the optical imaging systems 100, 200, 300, 400, and 500 described above, and may image long-distance objects. The camera modules 20 and 22 may be configured to present optical characteristics different from those of the camera modules 10 and 12 according to the example. In the example, the camera module 20 may be configured to image a short-distance object, and the camera module 22 may be configured to image an object located between a long distance and a short distance. The camera modules 10, 12, 20, and 22 may be configured to be arranged side by side in the longitudinal direction of the portable terminal 1004. However, the arrangement form of the camera modules 10, 12, 20, and 22 is not limited to Fig.15For example, the camera modules 10, 12, 20 and 22 may be arranged side by side in the width direction of the portable terminal 1004.

[0184] As explained above, according to an example, an optical imaging system and a camera module that can be mounted on a small terminal while having a long focal length can be implemented.

[0185] Although the present disclosure includes specific examples, it will be apparent after understanding the present disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application are understood in a descriptive sense only, and not for limiting purposes. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described system, architecture, device or circuit are replaced or supplemented in a different manner and / or by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. Camera module, comprising: A first optical path conversion unit configured to reflect or refract light incident along the first optical axis in the direction of a second optical axis that intersects the first optical axis; A second optical path conversion unit configured to reflect or refract light incident along the second optical axis in the direction of a third optical axis, wherein the third optical axis intersects the first optical axis and the second optical axis respectively; and An optical imaging system disposed between the first optical path conversion unit and the second optical path conversion unit, wherein the optical imaging system includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power, which are sequentially arranged from the object side to the imaging side, wherein the optical imaging system has a total of four lenses, wherein the refractive index of the third lens is equal to or greater than 1.65, and wherein the optical imaging system satisfies the conditional expression: 4.0 < BFL / ImgHT, 0.2 ≤ R1 / f ≤ 0.6, DT13 / f <0.27, and 0.5 < BFL / f, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface, ImgHT is the height of the imaging surface, R1 is the curvature radius of the object side surface of the first lens, f is the focal length of the optical imaging system, and DT13 is the distance from the object side surface of the first lens to the object side surface of the third lens.

2. The camera module according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 0.8≤TTL / f≤1.25, wherein TTL is the distance from the object side surface of the first lens to the imaging surface.

3. The camera module according to claim 1, wherein: The distance from the first intersection point of the first optical axis and the second optical axis to the second intersection point of the second optical axis and the third optical axis is greater than the focal length of the optical imaging system.

4. The camera module according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 3.5 ≤TTL / ImgHT, wherein TTL is the distance from the object side surface of the first lens to the imaging surface.

5. The camera module according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 2.1 <f / ImgHT.

6. The camera module according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 4.2 <BFL / T1, wherein T1 is the thickness of the first lens along the optical axis at its center.

7. Camera module, comprising: A first optical path conversion unit and a second optical path conversion unit, each of the first optical path conversion unit and the second optical path conversion unit being configured to change the optical path; and An optical imaging system disposed between the first optical path conversion unit and the second optical path conversion unit, wherein the optical imaging system includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power, which are sequentially arranged from the object side to the imaging side, and the optical imaging system has a total of four lenses, wherein the refractive index of the third lens is equal to or greater than 1.65, wherein the optical imaging system satisfies the conditional expression: 4.0 < BFL / ImgHT, 0.2 ≤ R1 / f ≤ 0.6, DT13 / f <0.27, and 0.5 < BFL / f, Among them, BFL is the distance from the image side surface of the fourth lens to the imaging plane, ImgHT is the height of the imaging plane, R1 is the radius of curvature of the object side surface of the first lens, f is the focal length of the optical imaging system, and DT13 is the distance from the object side surface of the first lens to the object side surface of the third lens.

8. The camera module according to claim 7, wherein: The third lens has a shape in which the object side surface is convex and the image side surface is concave.

9. The camera module according to claim 7, wherein: BFL is equal to or greater than 15 mm.

10. Terminal equipment, including: A camera module including a first reflective member and a second reflective member, each of the first reflective member and the second reflective member being each configured to change an optical path; as well as Optical imaging system, including: A first lens having positive refractive power; The second lens has negative refractive power; a third lens having negative refractive power and a convex object-side surface and a concave image-side surface; and The fourth lens has positive refractive power. The optical imaging system has four lenses in total. Wherein, the refractive index of the third lens is equal to or greater than 1.65, Wherein, the optical imaging system satisfies the conditional expression: 4.0 < BFL / ImgHT, 0.2 ≤ R1 / f ≤ 0.6, DT13 / f <0.27, and 0.5 < BFL / f, Among them, BFL is the distance from the image side surface of the fourth lens to the imaging plane, ImgHT is the height of the imaging plane, R1 is the radius of curvature of the object side surface of the first lens, f is the focal length of the optical imaging system, and DT13 is the distance from the object side surface of the first lens to the object side surface of the third lens.

11. The terminal device according to claim 10, wherein: The back focal length BFL of the optical imaging system is equal to or greater than 15 mm.

12. The terminal device according to claim 10, wherein: The focal length of the first lens is in the range of 8.0 mm to 25.0 mm.

13. The terminal device according to claim 10, wherein: The optical imaging system is disposed between the first reflecting member and the second reflecting member.

14. Camera module, including: An optical imaging system, comprising: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; and a fourth lens having positive refractive power; a first reflecting member disposed on the object side of the first lens and configured to change a first optical path; a second reflecting member disposed on the image side of the fourth lens and configured to change the second optical path; and a third reflecting member disposed adjacent to the second reflecting member and configured to change a third light path, Wherein, the first lens to the fourth lens are arranged in sequence from the object side to the imaging side, The optical imaging system has four lenses in total. Wherein, the refractive index of the third lens is equal to or greater than 1.65, Wherein, the optical imaging system satisfies the conditional expression: 4.0 < BFL / ImgHT, 0.2 ≤ R1 / f ≤ 0.6, DT13 / f <0.27, and 0.5 < BFL / f, Among them, BFL is the distance from the image side surface of the fourth lens to the imaging plane, ImgHT is the height of the imaging plane, R1 is the radius of curvature of the object side surface of the first lens, f is the focal length of the optical imaging system, and DT13 is the distance from the object side surface of the first lens to the object side surface of the third lens.

15. The camera module according to claim 14, wherein: The second lens has a focal length in the range of -50.0 mm to -6.0 mm.

16. The camera module according to claim 14, wherein: The first lens has a convex object-side surface.

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