Camera module and portable terminal

Abstract

The present disclosure relates to a camera module and a portable terminal. The camera module includes a lens module, the lens module including a plurality of lenses having refractive power, and a first optical path folding unit disposed on an object side of the lens module and configured to refract or reflect incident light in the direction of an optical axis of the lens module. Among the lenses constituting the lens module, the effective radius of the lens closest to the first optical path folding unit may be substantially the same as the effective radius of an exit surface of the first optical path folding unit.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10 - 2020 - 0103310, filed with the Korean Intellectual Property Office on August 18, 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 and a portable terminal, in which a reduction in resolution caused by a reflection phenomenon at an incident surface or an exit surface of a light - transmitting member can be significantly reduced. Background art

[0004] A camera module includes a light - transmitting member. For example, the camera module includes a filter member for blocking ultraviolet rays. As another example, the camera module may include an optical path folding unit such as a prism. Light - transmitting members such as the filter member and the prism are configured to transmit light. An interface of the light - transmitting member where light is incident or emitted is a portion where the refractive index of the medium changes, and thus light reflection occurs. Reflection of light at the interface of the light - transmitting member may reduce the resolution of the camera module and cause a flare phenomenon. Summary of the invention

[0005] The present Summary of the Invention section is intended to introduce, in a brief form, selections of inventive concepts, which 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 be used to help determine the scope of the claimed subject matter.

[0006] Examples provide a camera module and a portable terminal configured to reduce or suppress a light reflection phenomenon generated from a light - transmitting member.

[0007] In general, a camera module includes a lens module, the lens module including a plurality of lenses having refractive power and a first optical path folding unit disposed on an object side of the lens module and configured to refract or reflect incident light in an optical axis direction of the lens module. Among the lenses constituting the lens module, an effective radius of the lens closest to the first optical path folding unit may have a size substantially the same as an effective radius of an exit surface of the first optical path folding unit.

[0008] The camera module may satisfy 1.0 < PRh / LES1 < 1.10, where PRh is a maximum effective radius of an exit surface of the first optical path folding unit, and LES1 is a maximum effective radius of the lens closest to the object side in the lens module.

[0009] The first optical path folding unit may include an antireflection layer disposed thereon.

[0010] The anti-reflection layer may be disposed on one or both of the incident surface of the first light path folding unit and the exit surface of the first light path folding unit.

[0011] The anti-reflection layer may include a plurality of protrusions.

[0012] The anti-reflection layer may include a first anti-reflection layer disposed on the incident surface of the first light path folding unit and including a first protrusion, and a second anti-reflection layer disposed on the exit surface of the first light path folding unit and including a second protrusion.

[0013] The first protrusion and the second protrusion may have different sizes.

[0014] The formation gap of the first protrusion may be different from the formation gap of the second protrusion.

[0015] At least one or more lenses constituting the lens module may be configured to have different sizes in a first direction and a second direction intersecting the optical axis.

[0016] The lens module may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed from an object side of the lens module.

[0017] The first lens, the third lens, and the fifth lens may have positive refractive power, and the second lens and the fourth lens may have negative refractive power.

[0018] At least four of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may have a convex object-side surface.

[0019] At least three of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may have concave image-side surfaces.

[0020] The camera module may include a second optical path folding unit disposed between the lens module and the imaging surface.

[0021] The second anti-reflection layer may include a protrusion, and may be disposed on one or both of the incident surface of the second light path folding unit and the exit surface of the second light path folding unit.

[0022] The portable terminal may include a camera module.

[0023] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a configuration diagram of a camera module according to an example.

[0025] Figure 2A and 2B is an enlarged view of a first light path folding unit according to an example.

[0026] Figure 3 yes Figure 2A and Figure 2B An enlarged view of portion A is shown.

[0027] Figure 4 is an enlarged view of a first optical path folding unit according to another form.

[0028] Figure 5A and Figure 5B yes Figure 4 Enlarged views of portion B and portion D are shown.

[0029] Figure 6A and Figure 6B This is an enlarged perspective view of lenses constituting the lens module.

[0030] Figure 7 is a configuration diagram of a camera module including a lens module according to an example.

[0031] Figure 8 yes Figure 7 Aberration diagram of the lens module shown.

[0032] Figure 9 is a configuration diagram of a camera module including a lens module according to another example.

[0033] Figure 10 yes Figure 9 Aberration diagram of the lens module shown.

[0034] Figure 11 is a configuration diagram of a camera module including a lens module according to another example.

[0035] Figure 12 yes Figure 11 Aberration diagram of the lens module shown.

[0036] Figure 13 is a configuration diagram of a camera module including a lens module according to another example.

[0037] Figure 14 yes Figure 13 Aberration diagram of the lens module shown.

[0038] Figure 15 is a configuration diagram of a camera module including a lens module according to another example.

[0039] Figure 16 yes Figure 15 Aberration diagram of the lens module shown.

[0040] Figure 17 is a configuration diagram of a camera module including a lens module according to another example.

[0041] Figure 18 yes Figure 17 Aberration diagram of the lens module shown.

[0042] Figure 19 yes Figure 18 An enlarged view of the first optical path folding unit is shown.

[0043] Figure 20 yes Figure 18 An enlarged view of the second optical path folding unit is shown.

[0044] Figure 21 is a rear view of a portable terminal according to an example.

[0045] In all drawings and detailed description, the same reference numerals refer to the same elements. For the purpose of clarity, illustration and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0046] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent to those of ordinary skill in the art. Except for operations that must occur in a specific order, the order of operations described herein is merely an example and is not limited to the order set forth herein, but may be modified in a manner that is apparent to those of ordinary skill in the art. In addition, for greater clarity and brevity, descriptions of functions and configurations that will be familiar to those of ordinary skill in the art may be omitted.

[0047] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the embodiments described herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0048] In this document, it should be noted that use of the word "may" with respect to an embodiment or example (e.g., with respect to what an embodiment or example may include or implement) means that there is at least one embodiment or example that includes or implements such feature, 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 are no other elements between the element and the other element.

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

[0051] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, without departing from the teachings of the examples described herein, a first member, first component, first region, first layer, or first portion mentioned in an example may also be referred to as a second member, second component, second region, second layer, or second portion.

[0052] Spatially relative terms such as "above," "upper," "below," and "lower" may be used herein 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 cover different orientations of the device in use or operation. For example, if the device in the drawings is turned over, an element described as being "above" or "above" relative to another element will be "below" or "lower" relative to the other element. Thus, the term "above" covers both "above" and "below" orientations, 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 terms used herein should be interpreted accordingly.

[0053] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include the plural forms as well. The terms "include", "comprising" and "having" specify the presence of stated features, numbers, operations, components, elements and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0054] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shape that occur during manufacturing.

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

[0056] The drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

[0057] The optical imaging system includes a plurality of lenses arranged along an optical axis. The plurality of lenses may be spaced apart from each other by a predetermined distance along the optical axis.

[0058] For example, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in ascending order along the optical axis from the object side of the optical imaging system toward the imaging plane of the optical imaging system, wherein the first lens is closest to the object side of the optical imaging system and the fifth lens is closest to the imaging plane.

[0059] In each lens, the object-side or first surface is the surface of the lens closest to the object side of the optical imaging system, and the image-side or second surface is the surface of the lens closest to the imaging plane.

[0060] Unless otherwise specified, references to the shape of a lens surface refer to the shape of the paraxial region of the lens surface. The paraxial region of the lens surface is the central portion of the lens surface that surrounds and includes the optical axis of the lens surface, where light rays incident on the lens surface form a small angle θ with the optical axis and the following approximations are valid: sinθ≈θ, tanθ≈θ, and cosθ≈1.

[0061] For example, the statement that the object side surface of a lens is convex means that at least the paraxial region of the object side surface of the lens is convex, and the statement that the image side surface of the lens is concave means that at least the paraxial region of the image side surface of the lens is concave. Therefore, even if the object side surface of a lens can be described as convex, the entire object side surface of the lens may not be convex, and the peripheral region of the object side surface of the lens may be concave. Furthermore, even if the image side surface of a lens can be described as concave, the entire image side surface of the lens may not be concave, and the peripheral region of the image side surface of the lens may be convex.

[0062] At least one of the first to fifth lenses of the optical imaging system may have at least one aspherical surface.

[0063] For example, one or both of the object-side surface and the image-side surface of at least one of the first to fifth lenses may be aspherical. Each aspherical surface is defined by the following equation 1.

[0064]

[0065] In Equation 1, c is the curvature of the lens surface and is equal to the inverse of the radius of curvature of the lens surface at the optical axis of the lens surface, K is the conic constant, Y is the distance from any point on the lens surface to the optical axis of the lens surface in a direction perpendicular to the optical axis of the lens surface, A to H are aspheric constants, and Z (also called sag) is the distance from a point on the lens surface at a distance Y from the optical axis of the lens surface to a tangent plane perpendicular to the optical axis and intersecting the vertex of the lens surface in a direction parallel to the optical axis of the lens surface.

[0066] In addition to the first to fifth lenses, the optical imaging system may further include other elements.

[0067] The optical imaging system may further include at least one aperture stop disposed before the first lens, or between any two adjacent lenses among the first to fifth lenses, or between the fifth lens and the imaging plane. The optical imaging system may include two or more aperture stops disposed at different positions.

[0068] The optical imaging system may further include an image sensor having an imaging surface disposed at an imaging plane of the optical imaging system. The image sensor converts an image of an object formed on an effective imaging area of ​​the imaging surface by a lens of the optical imaging system into an electrical signal.

[0069] The optical imaging system may further include an infrared blocking filter, hereinafter referred to as a filter, for blocking infrared light. The filter may be disposed between the fifth lens and the imaging plane.

[0070] The optical imaging system may further include at least one reflective member having a reflective surface that changes the direction of the light path in the optical imaging system. For example, the reflective member may be a prism or a mirror.

[0071] For example, the reflective member may be provided in the optical path on the object side of the first lens, in the optical path between any two lenses of the second to fifth lenses, or in the optical path on the image side of the fifth lens.

[0072] For example, the optical imaging system may further include a first reflective member disposed in an optical path between the object side of the optical imaging system and the object side surface of the first lens. Therefore, the first lens may be the lens disposed closest to the first reflective member among the first to fifth lenses.

[0073] In addition, the optical imaging system may further include a second reflective member disposed in the optical path between the image-side surface of the fifth lens and the imaging surface. Therefore, the fifth lens may be the lens disposed closest to the second reflective member among the first to fifth lenses.

[0074] TTL is the distance along the optical axis from the object side of the first lens to the image plane.

[0075] SL is the distance along the optical axis from the aperture of the optical imaging system to the imaging plane.

[0076] BFL is the distance along the optical axis from the image-side surface of the fifth lens to the image plane.

[0077] The PTTL is the distance from the reflection surface of the first reflection member to the imaging plane along the optical axis.

[0078] ImgH is the maximum effective image height of the optical imaging system and is equal to half the diagonal length of the effective imaging area of ​​the imaging surface of the image sensor.

[0079] f is the focal length of the optical imaging system, and f1, f2, f3, f4, and f5 are the respective focal lengths of the first to fifth lenses.

[0080] FOV is the field of view of an optical imaging system.

[0081] Fno is the f-number of the optical imaging system, and is equal to the focal length f of the optical imaging system divided by the entrance pupil diameter of the optical imaging system.

[0082] The effective aperture ratio of a lens surface is the radius of the portion of the lens surface through which light actually passes, and is not necessarily the radius of the outer edge of the lens surface. In other words, the effective aperture ratio of a lens surface is the distance, perpendicular to the optical axis of the lens surface, between the optical axis and the marginal ray passing through the lens surface. The object-side surface and image-side surface of a lens can have different effective aperture ratios.

[0083] The radius of curvature of the lens surface, the thickness of the lens and other elements, the distance between adjacent lenses and other elements in the lens, the focal length of the lens, the focal length f of the optical imaging system, the respective focal lengths f1, f2, f3, f4, and f5 of the first through fifth lenses, TTL, SL, BFL, PTTL, and ImgH are expressed in millimeters (mm), although other units of measurement may also be used. FOV is expressed in degrees. Fno, the refractive index of the lens, and the Abbe number of the lens are dimensionless quantities.

[0084] The thickness of lenses and other components, the distance between adjacent lenses and other components, TTL, SL, BFL, and PTTL are measured along the optical axis of the optical imaging system.

[0085] Will refer to Figure 1 A camera module according to examples is described.

[0086] The camera module 100 may include a first optical path folding unit 200 and a lens module 500 .

[0087] The first optical path folding unit 200 may be disposed at the frontmost position in the camera module 100. The first optical path folding unit 200 may be disposed on the object side of the lens module 500. The first optical path folding unit 200 may be configured to refract or reflect light incident through the opening of the camera module 100 in the direction of the optical axis of the lens module 500. For example, the first optical path folding unit 200 may refract or reflect light incident along the first optical axis C1 in the direction of the second optical axis C2. The first optical axis C1 and the second optical axis C2 may intersect with each other. The first optical path folding unit 200 may be in the form of a prism or a reflector. However, the shape of the first optical path folding unit 200 is not limited to a prism and a reflector.

[0088] The lens module 500 may include one or more lenses. For example, the lens module 500 may include two or more lenses. However, the number of lenses constituting the lens module 500 is not limited to two. For example, the lens module 500 may be composed of five lenses, such as Figure 1 shown.

[0089] The lens module 500 may form a predetermined size relationship with the first optical path folding unit 200. For example, the maximum effective radius LES1 of the lens closest to the object side in the lens module 500 may be approximately the same as the maximum effective radius PRh of the exit surface of the first optical path folding unit 200. Specifically, PRh / LES1 may be greater than 1.0 and less than 1.10.

[0090] The camera module 100 may also include an optical filter IF and an image sensor IP. The optical filter IF and the image sensor IP may be disposed behind the lens module 500. The optical filter IF may be configured to block light of a specific wavelength from being incident on the image sensor IP. For example, the optical filter IF may be configured to block light having infrared wavelengths. The image sensor IP may be configured to convert an incident light signal into an electrical signal. For example, the image sensor IP may be of a CMOS type.

[0091] The camera module 100 according to an example may be configured to suppress a flare phenomenon. For example, the camera module 100 may include an anti-reflection layer 300 .

[0092] The anti-reflection layer 300 may be configured to reduce a flare phenomenon caused by reflection of light incident on the camera module 100. The anti-reflection layer 300 may be formed on the first light path folding unit 200, as shown in FIG. Figure 2A and Figure 2BFor example, the anti-reflection layer 300 may be formed on the incident surface of the first light path folding unit 200 ( Figure 2A ) or formed on the exit surface of the first optical path folding unit 201 ( Figure 2B ). The anti-reflection layer 300 can reduce the size of the first light path folding unit 200. For example, by using the anti-reflection layer 300, the size of the first light path folding unit 200 in the width direction (PRhx*2) or the size of the first light path folding unit 200 in the height direction (PRhy*2), or the size of the first light path folding unit 201 in the width direction (PRhx*2) and the size of the first light path folding unit 201 in the height direction (PRhy*2) can be reduced. Therefore, the camera module 100 according to the example is advantageous for miniaturization and thinning, and thus the camera module 100 according to the example can be mounted on an ultra-thin portable terminal.

[0093] The anti-reflection layer 300 may include a plurality of protrusions 310 formed with a first height h1, such as Figure 3 As shown. The protrusions 310 may be provided along the incident surface of the first optical path folding unit 200 or the exit surface of the first optical path folding unit 201 with the first gap P1 between the protrusions 310. The first height h1 and the first gap P1 of the protrusions 310 may vary depending on the type of the camera module 100 or the formation position of the anti-reflection layer 300. For example, the first height h1 or the first gap P1 of the protrusions 310 formed on the incident surface of the first optical path folding unit 200 may be different from the first height h1 or the first gap P1 of the protrusions 310 formed on the exit surface of the first optical path folding unit 201. However, the protrusions 310 formed on the incident surface of the first optical path folding unit 200 and the protrusions 310 formed on the exit surface of the first optical path folding unit 201 are not necessarily formed with different heights or different gaps.

[0094] According to another example, Figure 4 、 Figure 5A and Figure 5BAs shown, the anti-reflection layers 300 and 302 may be formed on both the incident surface and the exit surface of the first light path folding unit 202. The first anti-reflection layer 300 formed on the incident surface of the first light path folding unit 202 may be configured differently from the second anti-reflection layer 302 formed on the exit surface of the first light path folding unit 202. For example, the first height h1 of the first protrusions 310 constituting the first anti-reflection layer 300 and the first gap P1 between the first protrusions 310 may be different from the second height h2 of the second protrusions 320 and the second gap P2 between the second protrusions 320. For example, the first height h1 of the first protrusions 310 may be smaller than the second height h2 of the second protrusions 320. As another example, the first gap P1 between the first protrusions 310 may be smaller than the second gap P2 between the second protrusions 320. However, the size relationship between the first protrusions 310 of the first anti-reflection layer 300 and the second protrusions 320 of the second anti-reflection layer 302 is not limited to the above-described form. For example, a first height h1 of the first protrusions 310 may be greater than a second height h2 of the second protrusions 320. As another example, a first gap P1 between the first protrusions 310 may be greater than a second gap P2 between the second protrusions 320.

[0095] According to this form, the first optical path folding unit 202 has anti-reflection layers 300 and 302 formed on both the incident surface and the exit surface, thereby blocking or reducing light reflection that may be caused on the incident surface and the exit surface and the flare phenomenon caused by the light reflection.

[0096] Next, we will refer to Figure 6A and Figure 6B The frontmost lens (the lens closest to the object side) of the lens module 500 is described.

[0097] The lens module 500 may include a plurality of lenses. One of the plurality of lenses may be formed to be larger than the other lenses. For example, in the lens module 500, the effective radii LES1x and LES1y of the frontmost lens 510 may be larger than the effective radii of the other lenses. The effective diameter (2*LES1x, 2*LES1y) of the frontmost lens 510 may have a size that is approximately the same as the width or height of the exit surface of the first light path folding unit 200 (or 201 or 202). As an example, the effective diameter (2*LES1x) of the frontmost lens 510 in the first direction may have a size that is approximately equal to or smaller than the width (2*PRhx) of the exit surface of the first light path folding unit 200 (or 201 or 202). As another example, the effective diameter (2*LES1y) of the frontmost lens 510 in the second direction may have a size that is approximately equal to or smaller than the height (2*PRhy) of the exit surface of the first light path folding unit 200 (or 201 or 202). The frontmost lens 510 may be formed to have different sizes in a first direction intersecting the second optical axis C2 and in a second direction intersecting the second optical axis C2. For example, the frontmost lens 510 may have a substantially rectangular shape when viewed from the second optical axis C2.

[0098] The front lens 510 can be configured as Figure 6B The camera module 100 may be thinner in the form shown. For example, the effective radius LES1y of the frontmost lens 510 in the second direction may be smaller than the effective radius LES1x of the frontmost lens 510 in the first direction.

[0099] The camera module 100 including the first optical path folding unit 200 (or 201 or 202), the lens module 500 and the anti-reflection layer 300 and / or 302 in the above-mentioned form can significantly reduce the reflection of incident light and the flare phenomenon caused by light reflection, thereby obtaining high-resolution photos and videos.

[0100] Next, the configuration of the lens module constituting the camera module will be described in detail.

[0101] A camera module according to an example may include a lens module satisfying one or more of the following conditional expressions.

[0102] 10mm≤f

[0103] 1.0 <PRh / LES1<1.1

[0104] 3.2 <n2+n3

[0105] |f1+f2|<2.0

[0106] 0≤DL1L2 / f

[0107] 0.8 <EL1S1 / ImgHT<1.5

[0108] 0.8≤EL1S2 / EL1S1≤1.0

[0109] 0.8≤TTL / f≤0.95

[0110] 3.5≤TTL / ImgHT

[0111] 0.2 <R1 / f≤0.6

[0112] 2.6 <f-number

[0113] |f / f1+f / f2|<1.2

[0114] 4.0 <f / (f-number)

[0115] In the above conditional expressions, f is the focal length of the optical system, PRh is the maximum effective radius of the optical path folding unit, LES1 is the maximum effective radius of the lenses constituting the lens module, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, DL1L2 is the distance from the image side surface of the first lens to the object side surface of the second lens, 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, TTL is the distance from the object side surface of the first lens to the imaging plane, ImgHT is the height of the imaging plane (half the diagonal length of the imaging plane), R1 is the radius of curvature of the object side surface of the first lens, and f-number is the f-number of the optical system.

[0116] Next, a detailed example of the camera module will be described.

[0117] First, refer to Figure 7 A camera module according to a first example is described.

[0118] The camera module 101 may include a first optical path folding unit 201 , a lens module 501 , an optical filter IF, and an image sensor IP.

[0119] The first optical path folding unit 201 can be configured to refract or reflect the path of incident light incident along the first optical axis C1 in the direction of the second optical axis C2. For example, the first optical path folding unit 201 can be a prism. As described above, an anti-reflection layer can be formed on the incident surface or the exit surface, or both, of the first optical path folding unit 201.

[0120] The optical filter IF is disposed in front of the image sensor IP and can block infrared rays, etc., included in the incident light. The image sensor IP may be composed of multiple optical sensors. The image sensor IP may be configured to convert optical signals into electrical signals. The image sensor IP may form an imaging surface, on which light incident through the lens module 501 is formed.

[0121] The lens module 501 includes a first lens 511 , a second lens 521 , a third lens 531 , a fourth lens 541 , and a fifth lens 551 , which are sequentially arranged from the object side.

[0122] The first lens 511 has positive refractive power. The first lens 511 has a convex object-side surface and a convex image-side surface. The second lens 521 has negative refractive power. The second lens 521 has a convex object-side surface and a concave image-side surface. The third lens 531 has positive refractive power. The third lens 531 has a convex object-side surface and a concave image-side surface. The fourth lens 541 has negative refractive power. The fourth lens 541 has a convex object-side surface and a concave image-side surface. The fifth lens 551 has positive refractive power. The fifth lens 551 has a convex object-side surface and a concave image-side surface.

[0123] Table 1 shows the lens characteristics of the lens module 501 , and Table 2 provides the aspherical surface values ​​of the lens module 501 . Figure 8 : is the aberration curve of the lens module 501 configured as above.

[0124] [Table 1]

[0125]

[0126]

[0127] [Table 2]

[0128]

[0129]

[0130] Will refer to Figure 9 A camera module according to a second example is described.

[0131] The camera module 102 may include a first optical path folding unit 202 , a lens module 502 , an optical filter IF, and an image sensor IP.

[0132] The first optical path folding unit 202 can be configured to refract or reflect the path of incident light incident along the first optical axis C1 in the direction of the second optical axis C2. For example, the first optical path folding unit 202 can be a prism. As described above, an anti-reflection layer can be formed on the incident surface or the exit surface of the first optical path folding unit 202, or on both the incident surface and the exit surface.

[0133] The optical filter IF is disposed in front of the image sensor IP and can block infrared rays and other rays included in the incident light. The image sensor IP may be composed of multiple optical sensors. The image sensor IP may be configured to convert optical signals into electrical signals. The image sensor IP may form an imaging surface, on which light incident through the lens module 502 is formed into an image.

[0134] The lens module 502 includes a first lens 512 , a second lens 522 , a third lens 532 , a fourth lens 542 , and a fifth lens 552 .

[0135] The first lens 512 has positive refractive power. The first lens 512 has a convex object-side surface and a convex image-side surface. The second lens 522 has negative refractive power. The second lens 522 has a convex object-side surface and a concave image-side surface. The third lens 532 has positive refractive power. The third lens 532 has a convex object-side surface and a convex image-side surface. The fourth lens 542 has negative refractive power. The fourth lens 542 has a concave object-side surface and a concave image-side surface. The fifth lens 552 has positive refractive power. The fifth lens 552 has a convex object-side surface and a concave image-side surface.

[0136] Table 3 shows lens characteristics of the lens module 502 , and Table 4 shows aspherical surface values ​​of the lens module 502 . Figure 10 1 and 2 show aberration curves of the lens module 502 configured as above.

[0137] [Table 3]

[0138]

[0139]

[0140] [Table 4]

[0141]

[0142]

[0143] Will refer to Figure 11 A camera module according to a third example is described.

[0144] The camera module 103 may include a first optical path folding unit 203 , a lens module 503 , an optical filter IF, and an image sensor IP.

[0145] The first optical path folding unit 203 can be configured to refract or reflect the path of incident light incident along the first optical axis C1 in the direction of the second optical axis C2. For example, the first optical path folding unit 203 can be a prism. As described above, an anti-reflection layer can be formed on the incident surface or the exit surface of the first optical path folding unit 203, or on both the incident surface and the exit surface.

[0146] The filter IF is provided in front of the image sensor IP and can block infrared rays and the like included in the incident light. The image sensor IP may be composed of a plurality of optical sensors. The image sensor IP may be configured to convert optical signals into electrical signals. The image sensor IP may form an imaging surface on which light incident through the lens module 503 is formed.

[0147] The lens module 503 includes a first lens 513 , a second lens 523 , a third lens 533 , a fourth lens 543 , and a fifth lens 553 .

[0148] The first lens 513 has positive refractive power. The first lens 513 has a convex object-side surface and a convex image-side surface. The second lens 523 has negative refractive power. The second lens 523 has a concave object-side surface and a concave image-side surface. The third lens 533 has positive refractive power. The third lens 533 has a convex object-side surface and a concave image-side surface. The fourth lens 543 has negative refractive power. The fourth lens 543 has a convex object-side surface and a concave image-side surface. The fifth lens 553 has positive refractive power. The fifth lens 553 has a convex object-side surface and a concave image-side surface.

[0149] Table 5 shows lens characteristics of the lens module 503 , and Table 6 shows aspherical surface values ​​of the lens module 503 . Figure 12 1 and 2 show aberration curves of the lens module 503 configured as above.

[0150] [Table 5]

[0151]

[0152]

[0153] [Table 6]

[0154]

[0155]

[0156] Will refer to Figure 13 A camera module according to a fourth example is described.

[0157] The camera module 104 may include a first optical path folding unit 204 , a lens module 504 , an optical filter IF, and an image sensor IP.

[0158] The first optical path folding unit 204 can be configured to refract or reflect the path of incident light incident along the first optical axis C1 in the direction of the second optical axis C2. For example, the first optical path folding unit 204 can be a prism. As described above, an anti-reflection layer can be formed on the incident surface or the exit surface of the first optical path folding unit 204, or on both the incident surface and the exit surface of the first optical path folding unit 204.

[0159] The optical filter IF is disposed in front of the image sensor IP and can block infrared rays and other rays included in the incident light. The image sensor IP may be composed of multiple optical sensors. The image sensor IP may be configured to convert optical signals into electrical signals. The image sensor IP may form an imaging surface, on which light incident through the lens module 504 is formed.

[0160] The lens module 504 includes a first lens 514 , a second lens 524 , a third lens 534 , a fourth lens 544 , and a fifth lens 554 .

[0161] The first lens 514 has positive refractive power. The first lens 514 has a convex object-side surface and a convex image-side surface. The second lens 524 has negative refractive power. The second lens 524 has a concave object-side surface and a concave image-side surface. The third lens 534 has positive refractive power. The third lens 534 has a convex object-side surface and a concave image-side surface. The fourth lens 544 has negative refractive power. The fourth lens 544 has a convex object-side surface and a concave image-side surface. The fifth lens 554 has positive refractive power. The fifth lens 554 has a convex object-side surface and a concave image-side surface.

[0162] Table 7 shows lens characteristics of the lens module 504 , and Table 8 shows aspherical surface values ​​of the lens module 504 . Figure 14 1 and 2 show aberration curves of the lens module 504 configured as above.

[0163] [Table 7]

[0164]

[0165]

[0166] [Table 8]

[0167]

[0168]

[0169] Will refer to Figure 15 A camera module according to a fifth example is described.

[0170] The camera module 105 may include a first optical path folding unit 205 , a lens module 505 , an optical filter IF, and an image sensor IP.

[0171] The first optical path folding unit 205 can be configured to refract or reflect the path of incident light incident along the first optical axis C1 in the direction of the second optical axis C2. For example, the first optical path folding unit 205 can be a prism. As described above, an anti-reflection layer can be formed on the incident surface or the exit surface of the first optical path folding unit 205, or on both the incident surface and the exit surface of the first optical path folding unit 205.

[0172] The optical filter IF is disposed in front of the image sensor IP and can block infrared rays, etc., included in the incident light. The image sensor IP may be composed of multiple optical sensors. The image sensor IP may be configured to convert optical signals into electrical signals. The image sensor IP may form an imaging surface, on which light incident through the lens module 505 is formed.

[0173] The lens module 505 includes a first lens 515 , a second lens 525 , a third lens 535 , a fourth lens 545 , and a fifth lens 555 .

[0174] The first lens 515 has positive refractive power. The first lens 515 has a convex object-side surface and a convex image-side surface. The second lens 525 has negative refractive power. The second lens 525 has a concave object-side surface and a concave image-side surface. The third lens 535 has positive refractive power. The third lens 535 has a convex object-side surface and a convex image-side surface. The fourth lens 545 has negative refractive power. The fourth lens 545 has a concave object-side surface and a concave image-side surface. The fifth lens 555 has positive refractive power. The fifth lens 555 has a convex object-side surface and a concave image-side surface.

[0175] Table 9 shows the lens characteristics of the lens module 505 , and Table 10 shows the aspherical surface values ​​of the lens module 505 . Figure 16 1 and 2 show aberration curves of the lens module 505 configured as above.

[0176] [Table 9]

[0177]

[0178]

[0179] [Table 10]

[0180]

[0181]

[0182] Will refer to Figure 17 A camera module according to a sixth example is described.

[0183] The camera module 106 may include a first optical path folding unit 206 , a second optical path folding unit 210 , a lens module 506 , an optical filter IF, and an image sensor IP.

[0184] The first optical path folding unit 206 can be configured to refract or reflect the path of incident light incident along the first optical axis C1 in the direction of the second optical axis C2. For example, the first optical path folding unit 206 can be a prism. An anti-reflection layer having the above-described shape can be formed on the incident surface or the exit surface of the first optical path folding unit 206, or on both the incident surface and the exit surface.

[0185] The second optical path folding unit 210 can be configured to refract or reflect the path of incident light incident along the second optical axis C2 in the direction of the third optical axis C3. For example, the second optical path folding unit 210 can be a prism. An anti-reflection layer having the above-described shape can be formed on the incident surface or the exit surface of the second optical path folding unit 210, or on both the incident surface and the exit surface.

[0186] The optical filter IF is disposed in front of the image sensor IP and can block infrared rays, etc., included in the incident light. The image sensor IP may be composed of multiple optical sensors. The image sensor IP may be configured to convert optical signals into electrical signals. The image sensor IP may form an imaging surface, on which light incident through the lens module 506 is formed.

[0187] The lens module 506 includes a first lens 516 , a second lens 526 , a third lens 536 , a fourth lens 546 , and a fifth lens 556 .

[0188] The first lens 516 has positive refractive power. The first lens 516 has a convex object-side surface and a convex image-side surface. The second lens 526 has negative refractive power. The second lens 526 has a concave object-side surface and a concave image-side surface. The third lens 536 has positive refractive power. The third lens 536 has a convex object-side surface and a convex image-side surface. The fourth lens 546 has negative refractive power. The fourth lens 546 has a concave object-side surface and a concave image-side surface. The fifth lens 556 has positive refractive power. The fifth lens 556 has a convex object-side surface and a concave image-side surface.

[0189] Table 11 shows lens characteristics of the lens module 506 , and Table 12 shows aspherical surface values ​​of the lens module 506 . Figure 18 1 and 2 show aberration curves of the lens module 506 configured as above.

[0190] [Table 11]

[0191]

[0192]

[0193] [Table 12]

[0194]

[0195]

[0196] In the camera module 106 according to this example, anti-reflection layers 300 and 302 may be formed on the first light path folding unit 206 and the second light path folding unit 210. For example, Figure 19 and Figure 20 As shown, the first optical path folding unit 206 has a first anti-reflection layer 300 formed on the incident surface, and the second optical path folding unit 210 has a second anti-reflection layer 302 formed on the incident surface. The second optical path folding unit 210 may also have a second anti-reflection layer formed on the exit surface. The anti-reflection layers 300 and 302 may have a moth-eye shape including a plurality of protrusions as described above.

[0197] The first anti-reflection layer 300 and the second anti-reflection layer 302 may have the same type of moth-eye structure. However, the first anti-reflection layer 300 and the second anti-reflection layer 302 do not necessarily have the same moth-eye structure. For example, the first anti-reflection layer 300 may have a moth-eye structure having a denser protrusion density than the moth-eye structure of the second anti-reflection layer 302.

[0198] The camera module 106 configured as described above has anti-reflection layers 300 and 302 formed on the optical path folding units 206 and 210, respectively, wherein the optical path folding units 206 and 210 are respectively arranged on the object side and imaging surface of the lens module 506, thereby significantly improving the flare suppression effect through the anti-reflection layers 300 and 302.

[0199] Table 13 shows conditional expression values ​​of the lens module according to various examples.

[0200] [Table 13]

[0201]

[0202]

[0203] Will refer to Figure 21 A portable terminal according to an example is described.

[0204] The portable terminal 10 according to this example can be in the form of a wireless communication device. For example, the portable terminal 10 can be in the form of a wireless phone such as a smartphone. However, the portable terminal 10 according to this example is not limited to a wireless phone. For example, the portable terminal 10 can be one of other types, such as a laptop or notebook computer.

[0205] The portable terminal 10 may include a camera module 100. The camera module 100 may have Figure 1 6. Alternatively, the camera module 100 may be one of the types according to the first to sixth examples. For example, the camera module 100 may have a structure in which the flare phenomenon can be significantly reduced by the anti-reflection layer.

[0206] Therefore, the portable terminal 10 according to this example can take clear and high-resolution photos or videos through the camera module 100 under any environmental conditions.

[0207] As described above, according to the examples, reflection of light from a filter member or a light-transmitting member such as a prism can be reduced or suppressed.

[0208] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of this application 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 herein should be interpreted in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices or circuits are combined in different ways and / or replaced or supplemented with other components or their equivalents. Therefore, the scope of the present disclosure is not limited by the specific embodiments, but is limited 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. A camera module, comprising: lens module; a first optical path folding unit, disposed on the object side of the lens module and configured to refract or reflect incident light in the optical axis direction of the lens module; as well as an image sensor configured to convert an incident light signal passing through the lens module into an electrical signal, Wherein, 1.0 < PRh / LES1 < 1.10, wherein PRh is the maximum effective radius of the exit surface of the first optical path folding unit, and LES1 is the maximum effective radius of the lens closest to the object side in the lens module, Wherein, the first light path folding unit includes an anti-reflection layer arranged thereon, Wherein, the anti-reflection layer comprises: a first anti-reflection layer, disposed on the incident surface of the first light path folding unit and comprising a first protrusion; and a second anti-reflection layer, provided on the exit surface of the first light path folding unit and comprising a second protrusion, and Wherein, the first protrusion and the second protrusion have different sizes.

2. The camera module according to claim 1, wherein: The anti-reflection layer is disposed on one or both of the incident surface of the first light path folding unit and the exit surface of the first light path folding unit.

3. The camera module according to claim 1, wherein: The anti-reflection layer includes a plurality of protrusions.

4. The camera module according to claim 1, wherein: The first protrusions are formed with a gap different from the gap of the second protrusions.

5. The camera module according to claim 1, wherein At least one or more lenses constituting the lens module are configured to have different sizes in a first direction and a second direction intersecting the optical axis direction.

6. The camera module according to claim 1, wherein: The lens module includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from an object side of the lens module.

7. The camera module according to claim 6, wherein: The first lens, the third lens, and the fifth lens have positive refractive power, and The second lens and the fourth lens have negative refractive power.

8. The camera module according to claim 6, wherein: At least four of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens have a convex object-side surface.

9. The camera module according to claim 6, wherein: At least three of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens have concave image-side surfaces. 10 . The camera module according to claim 1 , further comprising a second optical path folding unit disposed between the lens module and an imaging surface. 11 . The camera module according to claim 10 , further comprising a second anti-reflection layer, the second anti-reflection layer comprising a protrusion and disposed on one or both of the incident surface of the second optical path folding unit and the exit surface of the second optical path folding unit. 12 . A portable terminal comprising the camera module according to claim 1 .

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