KR20220163238A - Lens assembly and camera module including the same - Google Patents

Abstract

A lens assembly according to an embodiment of the present invention includes: a plurality of lens arrays arranged in order from an object side toward an image side. Each of the lens arrays includes a plurality of lenses. Each of the plurality of lenses included in the lens array disposed closest to the image side has a length in a first axis direction perpendicular to an optical axis that may be greater than a length in a second axis direction perpendicular to both the optical axis and the first axis direction.

Description

Lens assembly and camera module including the same

The present invention relates to a lens assembly and a camera module including the same.

Recently, camera modules have been employed in portable electronic devices such as smart phones, tablet PCs, and laptop computers.

In addition, recently, the number of pixels of an image sensor increases and the size of an image sensor itself increases in order to capture a high-resolution image or video. Also, the number of lenses is increasing.

Due to this, the size of the camera module increases, and there is a problem that the camera module protrudes from the portable electronic device.

An object according to an embodiment of the present invention is to provide a camera module including a slim lens assembly and the same capable of taking high-resolution images or videos.

A lens assembly according to an embodiment of the present invention includes a plurality of lens arrays arranged in order from an object side toward an image side, each lens array including a plurality of lenses, and a lens disposed closest to the image side. Each of the plurality of lenses included in the array may have a length in a first axis direction perpendicular to the optical axis longer than a length in a second axis direction perpendicular to both the optical axis and the first axis direction.

A camera module according to an embodiment of the present invention includes a plurality of lens modules each including a plurality of lenses and disposed adjacent to each other; a housing accommodating the plurality of lens modules; and an image sensor module coupled to the housing and including one image sensor, wherein the image sensor has a long side extending in a first axis direction perpendicular to the optical axis, and both the optical axis and the first axis direction. Among the plurality of lenses included in each lens module and having a short side extending in a vertical second axis direction, lenses arranged closest to the image side have a length in the first axis direction equal to that in the second axis direction. can be longer than the length of

A lens assembly and a camera module including the same according to an embodiment of the present invention can capture high-resolution images or videos while miniaturizing the size.

1 is a perspective view of a camera module according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a plurality of lens arrays according to an embodiment of the present invention.
3 is a perspective view showing a part of a plurality of lens arrays of a lens assembly according to an embodiment of the present invention.
Figure 4 is a cross-sectional view of Figure 3;
5 is a perspective view of a spacer disposed between a plurality of lens arrays.
6 is an exploded perspective view of FIG. 3 .
7A and 7B are top views of some lens arrays.
8 is a schematic perspective view of a lens array and an image sensor of a camera module according to another embodiment of the present invention.
9 is a schematic cross-sectional view of a lens array according to another embodiment of the present invention.
10A to 10D show various embodiments of a non-circular lens applied to the embodiment shown in FIGS. 8 and 9 .
11 is a configuration diagram of a lens module according to an exemplary embodiment.
FIG. 12 is a diagram showing aberration characteristics of the lens module shown in FIG. 11;
13 is a configuration diagram of a lens module according to another embodiment.
14 is a diagram showing aberration characteristics of the lens module shown in FIG. 13;
15 is a plan view of a camera module according to an embodiment of the present invention except for a lens assembly.
16 is a perspective view of an infrared cut-off filter provided in a camera module according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented examples.

For example, those skilled in the art who understand the spirit of the present invention may suggest other embodiments included within the scope of the spirit of the present invention through the addition, change, or deletion of components, but this is also within the spirit of the present invention. would be considered within the scope.

In addition, terms including ordinal numbers such as “first” and “second” used herein may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

1 is a perspective view of a camera module according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a plurality of lens arrays according to an embodiment of the present invention.

The camera module according to an embodiment of the present invention may be applied to portable electronic devices such as mobile communication terminals, smart phones, and tablet PCs.

First, referring to FIGS. 1 and 2 , a camera module according to an embodiment of the present invention includes a lens assembly 100 , a housing 200 and an image sensor module 400 .

The lens assembly 100 includes a plurality of lens arrays 110 and a lens holder 130 .

A plurality of lens arrays 110 may be stacked and disposed along the optical axis.

Each of the lens arrays 111, 112, 113, 114, and 115 includes a plurality of lenses.

For example, in each of the lens arrays 111, 112, 113, 114, and 115, a plurality of lenses may be arranged in an n×n matrix structure or in an n×m matrix structure. n and m are each different natural numbers greater than or equal to 2.

The plurality of lens arrays 110 include a plurality of optical axes. For example, when a plurality of lenses are disposed in each of the lens arrays 111, 112, 113, 114, and 115 in a 2×2 matrix structure, the plurality of lens arrays 110 include four optical axes. A plurality of optical axes may be arranged parallel to each other.

A plurality of lenses sharing one optical axis may constitute one lens module. That is, when a plurality of lenses are arranged in a 2×2 matrix structure in each of the lens arrays 111, 112, 113, 114, and 115, the plurality of lens arrays 110 include four lens modules.

The total focal length deviation of each lens module is within ±0.03mm, the angle of view deviation is within ±3°, and the distortion deviation may be ±3°.

In addition, each lens module is a ratio (TTL/ (2×IMG HT)) may be 0.4 or less.

Hereinafter, for convenience of explanation, an embodiment in which a plurality of lenses are arranged in a 2×2 matrix structure in each lens array will be described. Also, the plurality of lens arrays may include 4 or 5 lens arrays arranged in order from the object side.

The lens assembly 100 may be accommodated in the housing 200 . The camera module may have a focus adjustment and/or shake correction function.

For example, the lens assembly 100 may be moved in an optical axis direction with respect to the housing 200 to adjust the focus. In addition, the lens assembly 100 may be moved in a direction perpendicular to the optical axis with respect to the housing 200 to compensate for shaking. Here, the optical axis direction may mean a vertical direction based on FIG. 1 .

To this end, the camera module according to an embodiment of the present invention may further include an actuator for moving the lens assembly 100 .

On the other hand, instead of moving the lens assembly 100 in the optical axis direction for focus adjustment, it is also possible to further include a separate adjustment lens for focus adjustment.

For example, each lens module may implement a focus adjustment function by including an adjustment lens disposed in front of a lens disposed closest to the object side.

The image sensor module 400 may be coupled to the housing 200 . The image sensor module 400 includes an image sensor 410 and a printed circuit board to which the image sensor 410 is connected. Here, the image sensor 410 is provided as one image sensor 410 .

That is, the lens assembly 100 includes a plurality of lens modules, and the image sensor module 400 does not include a plurality of image sensors corresponding to each lens module, but includes one image sensor 410.

A plurality of lens modules may each capture a subject by dividing an effective imaging area of one image sensor 410 .

The camera module according to an embodiment of the present invention may generate one completed image by synthesizing images captured by a plurality of lens modules.

That is, each lens module may photograph the same subject and synthesize the photographed images to generate one completed image having a higher resolution than individual images.

Recently, the number of pixels of an image sensor is increasing and the size of the image sensor is also increasing in order to capture a high-resolution image or video. However, the size of the lens module as well as the image sensor increases, so that the camera module eventually protrudes from the portable electronic device.

However, in the lens assembly 100 according to an embodiment of the present invention, a plurality of relatively small lens modules divide an effective imaging area of one large image sensor 410 to photograph a subject, respectively. By synthesizing the image, it is possible to miniaturize the lens assembly 100 while generating a high-resolution image.

Figure 3 is a perspective view showing a part of a plurality of lens arrays of a lens assembly according to an embodiment of the present invention, Figure 4 is a cross-sectional view of Figure 3, Figure 5 is a perspective view of a spacer disposed between a plurality of lens arrays , FIG. 6 is an exploded perspective view of FIG. 3 .

Referring to FIGS. 3 to 6 , a structure in which a plurality of lens arrays are stacked and arranged in an optical axis direction will be described. Although two lens arrays are shown in FIGS. 3 to 6 for convenience, each lens array may be combined with an adjacent lens array in the form shown in FIGS. 3 to 6 .

The first lens array 111 and the second lens array 112 may be stacked and disposed along the optical axis (Z-axis) direction.

Since a plurality of lenses are disposed for each lens array, the first lens array 111 and the second lens array 112 are combined so that the optical axes (Z-axis) of the lenses facing each other in the optical axis (Z-axis) direction are aligned. There is a need.

Therefore, the lens assembly 100 according to an embodiment of the present invention has a self-aligning structure such that the optical axes (Z-axis) of the plurality of lens arrays are aligned.

For example, one of the first lens array 111 and the second lens array 112 is provided with a protruding portion 111a, and the other one is provided with a groove portion 112a.

In one embodiment, the protrusion 111a is disposed on one surface of the first lens array 111 (eg, the surface facing the second lens array 112), and one surface (eg, the second lens array 112) The surface facing the one-lens array 111) is disposed with a groove portion 112a. The protruding portion 111a and the groove portion 112a may contact and be coupled to each other.

The first lens array 111 and the second lens array 112 may be coupled by combining the protrusion 111a and the groove 112a.

In addition, the protruding portion 111a and the groove portion 112a are provided so that optical axes (Z-axis) of the plurality of lenses of the first lens array 111 and the plurality of lenses of the second lens array 112 may be aligned with each other. A coupling position between the array 111 and the second lens array 112 may be guided.

In a direction from the first lens array 111 to the second lens array 112 (or from the protrusion 111a to the groove 112a), the protrusion 111a and the groove 112a gradually increase in diameter. It may have a decreasing shape.

For example, a surface on which the protrusion 111a and the groove 112a face each other in a direction perpendicular to the optical axis (Z-axis) may be an inclined curved surface. That is, the side surface of the protruding portion 111a and the inner wall of the groove portion 112a facing the protruding portion 111a may be inclined curved surfaces.

In one embodiment, the protrusion 111a may have a truncated cone shape, and the groove 112a may have a shape corresponding to the protrusion 111a.

The height of the protrusion 111a may be greater than the depth of the groove 112a. Therefore, the protrusions 111a and the grooves 112a contact each other and are guided along the inclined curved surface, and the remaining area of one surface of the first lens array 111 on which the protrusions 111a are not formed is the grooves 112a. It may be disposed spaced apart from the rest of the second lens array 112 in which is not formed in the direction of the optical axis (Z-axis).

The protruding portion 111a and the groove portion 112a may be located in an area surrounded by a plurality of lenses of each lens array. For example, the protrusion 111a and the groove 112a may be disposed at the center of each lens array.

By such a coupling structure, the first lens array 111 and the second lens array 112 may be coupled so that the optical axes (Z-axis) of the lenses facing each other in the optical axis (Z-axis) direction are aligned.

A spacer S may be disposed between the first lens array 111 and the second lens array 112 .

The spacer S may maintain a distance between the first lens array 111 and the second lens array 112 and may block unnecessary light. For example, a light blocking layer may be provided on the spacer S to block unnecessary light. The light blocking layer may be a black film or black iron oxide.

The spacer (S) may be a metal material. For example, the spacer S may be made of a non-ferrous metal material. For example, the spacer S may be made of phosphor bronze.

The spacer S has a plurality of openings S1 so that the plurality of lenses of each lens array face each other in the direction of the optical axis (Z-axis). In addition, a through hole (S2) is provided so that the protruding portion (111a) and the groove portion (112a) can be coupled to each other.

7A and 7B are top views of some lens arrays.

Referring to FIGS. 7A and 7B , a plurality of lenses disposed in at least one lens array among the plurality of lens arrays 110 may have a non-circular planar shape.

Since the plurality of lens modules included in the plurality of lens arrays 110 photograph the same subject, it is necessary to arrange the optical axis (Z-axis) of each lens module as close as possible.

Therefore, in the lens assembly 100 according to an embodiment of the present invention, a plurality of lenses disposed in at least one of the plurality of lens arrays 110 may have a non-circular planar shape.

In one embodiment, the plurality of lenses included in the lens array 111 (hereinafter, referred to as 'frontmost lens array') disposed closest to the object side may have a circular planar shape, and disposed closest to the image side. A plurality of lenses included in the lens array 115 (hereinafter referred to as 'rearmost lens array') may have a non-circular planar shape.

In one embodiment, a plurality of lenses included in the rearmost lens array, and included in the lens array disposed adjacent to the rearmost lens array 115 (eg, the lens array 114 disposed fourth from the object side) The plurality of lenses may have a non-circular planar shape.

In one embodiment, a plurality of lenses included in the frontmost lens array may have a circular planar shape, and a plurality of lenses included in the remaining lens arrays may have a non-circular planar shape.

In one embodiment, a plurality of lenses included in all lens arrays may have a non-circular planar shape.

In all embodiments, each of the plurality of lenses included in the rearmost lens array has a non-circular planar shape.

By configuring in this way, the lenses included in the plurality of lens arrays can be disposed close to each other.

Hereinafter, a plurality of lens shapes included in the rearmost lens array will be described.

In a plane perpendicular to the optical axis (Z-axis), a non-circular lens has a length in the direction of the first axis (X-axis) perpendicular to the optical axis (Z-axis) in the direction of the optical axis (Z-axis) and the first axis (X-axis) It is longer than the length in the second axis (Y axis) direction perpendicular to both. In the non-circular lens, the ratio of the length in the second axis (Y axis) direction to the length in the first axis (X axis) direction may be greater than 0.5 and less than 1.

For example, a non-circular lens has a shape in which a part of a circle is truncated when viewed in the direction of an optical axis (Z-axis).

Here, the first axis (X-axis) direction is a direction in which the long side of the image sensor 410 extends, and the second axis direction (Y-axis) is a direction in which the short side of the image sensor 410 extends.

Referring to FIGS. 7A and 7B , in one embodiment, a non-circular lens has a major axis and a minor axis. The long axis is the line segment connecting both sides of the non-circular lens in the first axis (X axis) direction while passing through the optical axis (Z axis), and is non-circular in the second axis (Y axis) direction while passing through the optical axis (Z axis). The line segment connecting both sides of the circular lens is the minor axis. The major axis and the minor axis are perpendicular to each other, and the length of the major axis is longer than that of the minor axis.

In the embodiment shown in FIG. 7A, the non-circular lens has four sides along the periphery of the non-circular lens. When viewed from the optical axis direction, two of the four side surfaces have a substantially straight line shape, and the other two side surfaces have an arc shape.

The two side surfaces having a straight line shape may be surfaces extending in the first axis (X-axis) direction.

In the embodiment shown in FIG. 7B , the non-circular lens has a straight line shape when viewed from the optical axis (Z axis) direction of the surface facing the other lens in the second axis (Y axis) direction, and the other is an arc (arc). ) has the shape

For example, the surfaces of the plurality of lenses included in the rearmost lens array facing each other in the direction of the second axis (Y-axis) have a straight line shape when viewed from the direction of the optical axis (Z-axis), and the other surfaces are aligned along the optical axis (Z-axis). It has an arc shape when viewed from the direction.

In general, since the image sensor 410 is rectangular, not all light refracted by a circular lens is formed on the image sensor 410 . Therefore, by making the lens have a non-circular shape, the size of the lens can be reduced without affecting image formation.

In addition, when each of the plurality of lenses included in the lens array has a circular shape, there is a problem in that the separation distance between the lenses increases.

However, in this embodiment, a plurality of lenses included in at least one lens array each have a non-circular planar shape, so that a plurality of optical axes can be disposed close to each other without affecting image formation.

On the other hand, since the non-circular lens has a major axis and a minor axis, it has a maximum diameter and a minimum diameter. Here, the maximum diameter of the non-circular lens is larger than the diameter of the circular lens.

That is, a lens having a relatively large diameter may have a non-circular planar shape.

8 is a schematic perspective view of a lens array and an image sensor of a camera module according to another embodiment of the present invention, and FIG. 9 is a schematic cross-sectional view of a lens array according to another embodiment of the present invention.

The embodiment shown in FIGS. 8 and 9 is the same as the embodiment shown in FIG. 2 except for the configuration of a plurality of lens arrays.

For example, in the embodiment shown in FIG. 2, the lens assembly 100 includes a plurality of lens arrays 110, and each of the lens arrays 111, 112, 113, 114, and 115 includes a plurality of lenses, , The plurality of lens arrays 110 include a plurality of optical axes.

However, in the embodiment shown in FIGS. 8 and 9 , the lens assembly 100 includes a plurality of lens modules 1 , 2 , 3 , and 4 each having an optical axis. Optical axes of each of the lens modules 1, 2, 3, and 4 may be arranged in parallel.

Each of the lens modules 1 , 2 , 3 , and 4 may be accommodated in a respective lens barrel, and each lens barrel may be disposed within one lens holder 130 . Accordingly, since the optical axes of the lenses can be aligned for each of the lens modules 1, 2, 3, and 4, the plurality of optical axes of the lens assembly 100 can be easily aligned.

10A to 10D show various embodiments of a non-circular lens applied to the embodiment shown in FIGS. 8 and 9 .

Among the plurality of lenses included in each of the lens modules 1, 2, 3, and 4, lenses disposed closest to the image side may have a non-circular planar shape.

For example, lenses disposed closest to the image side have a length in a first axis (X-axis) direction longer than a length in a second axis (Y-axis) direction.

The non-circular lens includes an optical part 10 and a flange part 30.

The optical unit 10 may be a part where the optical performance of the non-circular lens is exhibited. For example, light reflected from a subject may pass through the optical unit 10 and be refracted.

The optical unit 10 may have refractive power and have an aspherical shape.

The flange portion 30 may be configured to fix the non-circular lens to another component, for example, a lens barrel or other lens.

The flange portion 30 extends from the optical portion 10 and may be integrally formed with the optical portion 10 .

The optical part 10 is formed in a non-circular shape. For example, the optical unit 10 has a non-circular shape when viewed in the direction of the optical axis (Z-axis).

Referring to FIG. 10A, in a plane perpendicular to the optical axis (Z-axis), the optical unit 10 has lengths in the direction of the first axis (X-axis) perpendicular to the optical axis (Z-axis) and the optical axis (Z-axis). It is longer than the length in the second axis (Y axis) direction perpendicular to the first axis (X axis) direction.

The optical part 10 includes a first edge 11 , a second edge 12 , a third edge 13 and a fourth edge 14 .

When viewed in the direction of the optical axis (Z-axis), the first edge 11 and the second edge 12 each have an arc shape.

The second edge 12 is provided on the opposite side of the first edge 11 . In addition, the first edge 11 and the second edge 12 are positioned to face each other with respect to the optical axis (Z-axis).

The fourth edge 14 is provided on the opposite side of the third edge 13 . In addition, the third edge 13 and the fourth edge 14 face each other with respect to the optical axis (Z-axis).

The third edge 13 and the fourth edge 14 connect the first edge 11 and the second edge 12, respectively. The third edge 13 and the fourth edge 14 are symmetrical with respect to the optical axis (Z-axis), and may be formed parallel to each other.

When viewed from the optical axis (Z-axis) direction, the first edge 11 and the second edge 12 include an arc shape, and the third edge 13 and the fourth edge 14 are substantially straight. contains the shape

The optical unit 10 has a major axis and a minor axis. The line segment connecting the third edge 13 and the fourth edge 14 with the shortest distance along the optical axis (Z-axis) is the minor axis, and the first edge 11 and the second edge along the optical axis (Z-axis) The line connecting (12) and perpendicular to the minor axis is the major axis. The length of the major axis is longer than that of the minor axis.

The flange portion 30 extends along the circumference of a portion of the optical portion 10 in the first axis (X-axis) direction. At least a portion of the flange portion 30 contacts the inner surface of the lens barrel.

The flange portion 30 includes a first flange portion 31 and a second flange portion 32 . The first flange portion 31 extends from the first edge 11 of the optical portion 10 and the second flange portion 32 extends from the second edge 12 of the optical portion 10 .

The first edge 11 of the optical unit 10 may refer to a portion adjacent to the first flange unit 31, and the second edge 12 of the optical unit 10 may refer to a portion adjacent to the second flange unit 32. It can mean adjacent parts.

The third edge 13 of the optical unit 10 may mean one side of the optical unit 10 on which the flange unit 30 is not formed, and the fourth edge 14 of the optical unit 10 is a flange. It may mean the other side of the optical part 10 on which the branch 30 is not formed.

The side surface of the first flange portion 31 includes a first flat portion 31a and a first curved portion 31b. The first flat part 31a may mean a side surface meeting a line extending the long axis of the optical part 10 . The first flat portion 31a may be a flat surface.

First curved portions 31b are disposed on both sides of the first flat portion 31a. The first curved portion 31b may be a surface that contacts the inner surface of the lens barrel or may be a curved surface.

The second flange portion 32 includes a second flat portion 32a and a second curved portion 32b. The second plane portion 32a may refer to a side surface meeting a line extending the long axis of the optical portion 10 . The second flat portion 32a may be a flat surface.

On both sides of the second flat portion 32a, second curved portions 32b are disposed. The second curved portion 32b may be a surface that contacts the inner surface of the lens barrel or may be a curved surface.

Referring to FIGS. 10B to 10D , at least a part of the surface facing another lens disposed adjacent to each other of the non-circular lens has a straight line shape when viewed from the optical axis (Z-axis) direction, and the rest has an arc shape. have

For example, the plurality of lenses have a straight line shape when at least one of the surfaces facing each other in the first axis (X-axis) direction and the surface facing each other in the second axis (Y-axis) direction is viewed in the optical axis (Z-axis) direction. and the remaining surface has an arc shape when viewed from the optical axis direction.

11 is a configuration diagram of a lens module according to one embodiment, FIG. 12 is a diagram showing aberration characteristics of the lens module shown in FIG. 11, FIG. 13 is a configuration diagram of a lens module according to another embodiment, and FIG. is a diagram showing aberration characteristics of the lens module shown in FIG. 13 .

The lens module described with reference to FIGS. 11 to 14 may be any one of a plurality of lens modules according to the above-described embodiments. And, all of the plurality of lens modules may have the same specifications.

In this specification, the first surface of each lens means a surface close to the object side (or object side surface), and the second surface means a surface close to the image side (or image side surface). In addition, values for the radius of curvature, thickness, distance, and focal length of the lens are all units of mm, and the unit of the angle of view (FOV) is degree.

In addition, in the description of the shape of each lens, the convex shape of one surface means that the paraxial region portion of the corresponding surface is convex, and the concave shape of one surface means that the paraxial region portion of the corresponding surface is concave. Therefore, even if one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Likewise, even if one surface of the lens is described as having a concave shape, the edge portion of the lens may be convex.

Meanwhile, the paraxial region means a very narrow region near an optical axis.

The imaging plane may refer to a virtual plane on which a focus is formed by the lens module. Alternatively, the imaging surface may refer to one surface of an image sensor through which light is received.

A lens module according to an embodiment of the present invention includes 4 or 5 lenses.

For example, referring to FIG. 11 , the lens module according to an embodiment of the present invention includes a first lens L1, a second lens L2, a third lens L3, and a second lens L3 disposed in order from the object side. It includes 4 lenses (L4). The first lens L1 to the fourth lens L4 are spaced apart from each other by a predetermined distance along the optical axis (Z-axis).

Also, referring to FIG. 13 , in the lens module according to an embodiment of the present invention, a first lens L1, a second lens L2, a third lens L3, and a fourth lens are sequentially disposed from the object side. (L4) and a fifth lens (L5). The first lens L1 to the fifth lens L5 are spaced apart from each other by a predetermined distance along the optical axis (Z-axis).

A lens module according to an embodiment of the present invention does not consist of only 4 or 5 lenses and may further include other components as needed.

For example, the lens module may further include an infrared filter (F, hereinafter referred to as 'filter') for blocking infrared rays. A filter F is disposed between the rearmost lens and the imaging surface IM.

In addition, the lens module may further include a stop for adjusting the amount of light.

Meanwhile, at least one of a plurality of lenses constituting the lens module has an inflection point on at least one of an object-side surface and an image-side surface.

The inflection point means a point at which the surface of the lens changes from concave to convex or from convex to concave.

A plurality of lenses constituting the lens module are made of a plastic material.

Also, each of the first lens L1 to the third lens L3 may be made of a plastic material having optical characteristics different from those of adjacent lenses.

In one embodiment, a difference in Abbe number between the first lens L1 and the second lens L2 may exceed 30. Also, a difference in Abbe numbers between the second lens L2 and the third lens L3 may exceed 30.

In one embodiment, the second lens (L2) may be a plastic material having a high refractive index and low dispersion value. For example, the refractive index of the second lens L2 may be greater than 1.65 and the Abbe number may be less than 25.

In one embodiment, the lens module satisfies the condition 30 < |v1-v2| < 50 is satisfied. v1 is the Abbe's number of the first lens L1, and v2 is the Abbe's number of the second lens L2.

In one embodiment, the lens module satisfies the condition 30 < |v2-v3| < 50 is satisfied. v2 is the Abbe number of the second lens L2, and v3 is the Abbe number of the third lens L3.

A plurality of lenses constituting the lens module have an aspheric surface. For example, each of the plurality of lenses may have at least one aspherical surface.

Here, the aspherical surface of each lens is expressed by Equation 1.

In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the conic constant, and Y represents the distance from an arbitrary point on the aspheric surface of the lens to the optical axis. In addition, the constants A to J mean aspheric coefficients. And Z(SAG) represents the distance in the direction of the optical axis between an arbitrary point on the aspherical surface of the lens and the apex of the aspheric surface.

A lens module according to an embodiment of the present invention will be described with reference to FIGS. 11 and 12 .

A lens module according to an embodiment of the present invention includes a first lens (L1), a second lens (L2), a third lens (L3) and a fourth lens (L4), a filter (F) and an aperture (Stop ) may be further included.

The lens module according to an embodiment of the present invention may form a focus on the imaging surface IM. The imaging surface IM may refer to a surface on which a focus is formed by the lens module. For example, the imaging surface IM may refer to one surface of the image sensor 410 through which light is received.

Lens characteristics of each lens (radius of curvature, thickness of lens or distance between lenses, index of refraction, Abbe number, focal length, effective radius) radius)) is shown in Table 1.

side number note radius of curvature thickness or distance refractive index Abe number focal length effective radius S1 1st lens 1.6537 0.4683 1.546 56.114 3.3152 0.87 S2 17.2222 0.1101 0.769377 S3 iris Infinity 0.1123 0.693 S4 2nd lens -39.7256 0.5926 1.669 20.353 -6.2233 0.685 S5 4.6786 0.5421 0.71 S6 3rd lens -5.3216 0.8000 1.546 56.114 3.3095 1.2 S7 -1.4206 0.4613 1.375578 S8 4th lens 1.9282 0.4319 1.546 56.114 -3.5565 2.282654 S9 0.8910 0.4720 2.58

In one embodiment of the present invention, the first lens (L1) has a positive refractive power, the first surface of the first lens (L1) is convex shape, the second surface of the first lens (L1) is concave shape.

The second lens L2 has negative refractive power, and the first and second surfaces of the second lens L2 are concave.

The third lens L3 has positive refractive power, the first surface of the third lens L3 is concave, and the second surface of the third lens L3 is convex in the paraxial region.

Also, the third lens L3 has at least one inflection point on the second surface. For example, the second surface of the third lens L3 may be convex in the paraxial region and concave in parts other than the paraxial region.

The fourth lens L4 has negative refractive power, the first surface of the fourth lens L4 is convex in the paraxial region, and the second surface of the fourth lens L4 is concave in the paraxial region.

Also, the fourth lens L4 has at least one inflection point on at least one of the first and second surfaces. For example, the first surface of the fourth lens L4 may be convex in the paraxial region and concave in parts other than the paraxial region. Also, the second surface of the fourth lens L4 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens L1 to fourth lens L4 has an aspherical surface coefficient as shown in Table 2. For example, both the object side surface and the image side surface of the first lens L1 to the fourth lens L4 are aspheric surfaces.

S1 S2 S4 S5 S6 S7 S8 S9 Conic constant (K) 1.654 17.222 -39.726 4.679 -5.322 -1.421 1.928 0.891 4th order coefficient (A) 3.102E-01 -8.649E+01 -3.665E+01 -6.348E+01 1.855E+00 -2.331E-01 -2.810E+01 -4.970E+00 6th order coefficient (B) -2.538E-02 -1.427E-01 -4.776E-02 3.339E-01 -9.025E-02 -9.028E-02 -2.545E-01 -1.302E-01 8th order coefficient (C) 4.272E-01 2.236E+00 7.416E-01 -3.981E+00 5.977E-01 3.663E-01 1.412E-01 7.027E-02 Tenth order coefficient (D) -3.270E+00 -1.773E+01 -6.693E+00 4.168E+01 -2.920E+00 -8.575E-01 -7.557E-02 -2.866E-02 12th order coefficient (E) 1.420E+01 8.289E+01 3.328E+01 -2.661E+02 7.999E+00 1.285E+00 5.086E-02 7.293E-03 14th order coefficient (F) -3.776E+01 -2.422E+02 -1.018E+02 1.057E+03 -1.352E+01 -1.260E+00 -2.462E-02 -8.400E-04 16th order coefficient (G) 6.242E+01 4.449E+02 1.915E+02 -2.627E+03 1.447E+01 8.165E-01 7.230E-03 -5.500E-05 18th order coefficient (H) -6.255E+01 -4.979E+02 -2.145E+02 3.976E+03 -9.533E+00 -3.363E-01 -1.250E-03 2.820E-05 20th order coefficient (J) 3.473E+01 3.085E+02 1.300E+02 -3.348E+03 3.525E+00 8.135E-02 1.170E-04 -3.000E-06

Also, the imaging optical system configured as above may have aberration characteristics shown in FIG. 12 .

A lens module according to another embodiment of the present invention will be described with reference to FIGS. 13 and 14 .

A lens module according to another embodiment of the present invention includes a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4) and a fifth lens (L5), and a filter (F) and an aperture (Stop) may be further included.

A lens module according to another embodiment of the present invention may form a focal point on the imaging surface IM. The imaging surface IM may refer to a surface on which a focus is formed by the lens module. For example, the imaging surface IM may refer to one surface of the image sensor 410 through which light is received.

Lens characteristics of each lens (radius of curvature, thickness of lens or distance between lenses, index of refraction, Abbe number, focal length, effective radius) radius)) is shown in Table 3.

side number note radius of curvature thickness or distance refractive index Abe number focal length effective radius S1 1st lens 1.4931 0.6161 1.546 55.9 2.7663 0.995 S2 111.5397 0.1 0.924416 S3 2nd lens 3.05 0.1999 1.668 20.4 -5.4205 0.83 S4 1.6121 0.1924 0.73 S5 iris Infinity 0.1437 0.74846 S6 3rd lens -43.7373 0.4807 1.546 55.9 22.2635 0.828749 S7 -9.5491 0.5452 1.01 S8 4th lens -129.9230 0.4224 1.668 20.4 -15.4001 1.42 S9 11.1864 0.1443 1.656817 S10 5th lens 1.3404 0.5745 1.537 55.7 24.3341 2.1 S11 1.2700 0.2168 2.363082

In another embodiment of the present invention, the first lens L1 has positive refractive power, the first surface of the first lens L1 is convex, and the second surface of the first lens L1 is concave.

The second lens L2 has negative refractive power, the first surface of the second lens L2 is convex, and the second surface of the second lens L2 is concave.

The third lens L3 has positive refractive power, the first surface of the third lens L3 is concave, and the second surface of the third lens L3 is convex in the paraxial region.

Also, the third lens L3 has at least one inflection point on the second surface. For example, the second surface of the third lens L3 may be convex in the paraxial region and concave in parts other than the paraxial region.

The fourth lens L4 has negative refractive power, and the first and second surfaces of the fourth lens L4 are concave in the paraxial region.

Also, the fourth lens L4 has at least one inflection point on the second surface. For example, the second surface of the fourth lens L4 may be concave in the paraxial region and convex in parts other than the paraxial region.

The fifth lens L5 has positive refractive power, a first surface of the fifth lens L5 is convex in the paraxial region, and a second surface of the fifth lens L5 is concave in the paraxial region.

In addition, the fifth lens (L5) has at least one inflection point on the first surface and the second surface. For example, the first surface of the fifth lens L5 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens L5 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens L1 to fifth lens L5 has an aspherical surface coefficient as shown in Table 4. For example, both the object-side surface and the image-side surface of the first lens L1 to fifth lens L5 are aspheric surfaces.

S1 S2 S3 S4 S6 Conic constant (K) 1.493 111.540 3.046 1.612 -43.737 4th order coefficient (A) -2.619E-01 0.000E+00 -1.540E+01 -1.118E+00 9.900E+01 6th order coefficient (B) 5.130E-02 -1.380E-02 -2.358E-01 3.960E-02 -3.365E-01 8th order coefficient (C) -5.699E-01 -7.698E-01 1.190E+00 -4.561E+00 3.533E+00 Tenth order coefficient (D) 3.491E+00 6.938E+00 -4.256E+00 5.733E+01 -2.965E+01 12th order coefficient (E) -1.262E+01 -2.978E+01 1.337E+01 -3.821E+02 1.500E+02 14th order coefficient (F) 2.797E+01 7.530E+01 -2.972E+01 1.566E+03 -4.718E+02 16th order coefficient (G) -3.862E+01 -1.176E+02 4.189E+01 -4.023E+03 9.327E+02 18th order coefficient (H) 3.234E+01 1.115E+02 -3.421E+01 6.314E+03 -1.126E+03 20th order coefficient (J) -1.503E+01 -5.887E+01 1.380E+01 -5.528E+03 7.576E+02 S7 S8 S9 S10 S11 Conic constant (K) -9.549 -129.923 11.186 1.340 1.270 4th order coefficient (A) -9.209E+01 5.000E+01 3.407E+01 -1.873E+00 -1.006E+00 6th order coefficient (B) -5.820E-02 2.279E-01 -5.270E-02 -5.548E-01 -3.215E-01 8th order coefficient (C) -1.399E-01 -9.612E-01 -3.096E-01 6.136E-01 1.553E-01 Tenth order coefficient (D) 4.757E-01 2.490E+00 1.196E+00 -5.421E-01 -2.740E-02 12th order coefficient (E) -8.828E-01 -4.470E+00 -2.051E+00 3.234E-01 -2.270E-02 14th order coefficient (F) 1.050E+00 5.124E+00 1.920E+00 -1.204E-01 1.820E-02 16th order coefficient (G) -4.991E-01 -3.720E+00 -1.060E+00 2.730E-02 -6.000E-03 18th order coefficient (H) -2.307E-01 1.649E+00 3.459E-01 -3.600E-03 1.000E-03 20th order coefficient (J) 3.861E-01 -4.048E-01 -6.160E-02 2.000E-04 -1.000E-04

Also, the imaging optical system configured as above may have aberration characteristics shown in FIG. 14 .

15 is a plan view of a camera module according to an embodiment of the present invention except for a lens assembly, and FIG. 16 is a perspective view of an infrared cut-off filter provided in a camera module according to an embodiment of the present invention.

In the camera module according to an embodiment of the present invention, a plurality of lens modules divide an effective imaging area of one image sensor 410 to photograph a subject, and synthesize the captured images to create one complete image. .

In addition, since each lens module is placed close to each other, light passing through one lens module may affect the imaging area of an adjacent lens module, and the quality of an image captured by each lens module is deteriorated by such unnecessary light. It can be.

Therefore, the camera module according to an embodiment of the present invention includes the light blocking unit 330 in the infrared cut filter 300 to prevent light passing through one lens module from affecting the imaging area of the adjacent lens module. It can be prevented.

Like the image sensor 410, the infrared cut filter 300 is provided as one infrared cut filter 410.

That is, a plurality of infrared cutoff filters corresponding to each lens module are not provided, but one infrared cutoff filter 300 is provided.

The light blocking portion 330 may be a light absorbing layer that blocks unnecessary light among light incident on the infrared cut filter 300 . The light absorbing layer may be black.

The light blocking unit 330 may be disposed on at least one of an upper surface 310 (a surface facing the lens assembly) and a lower surface (a surface facing the image sensor) of the infrared cut filter 300 .

The infrared cut filter 300 may be divided into a plurality of regions by the light blocking portion 330 . For example, when a plurality of lenses are arranged in an n×n matrix structure in each lens array, the light blocking unit 330 may be arranged to extend in directions orthogonal to each other from the center of the infrared cut filter 300 . Accordingly, the infrared cut filter 300 may be divided into four regions.

Since the infrared cut filter 300 is disposed close to the image sensor 410, the light passing through each lens module is directed to the imaging area of the neighboring lens module by forming the light blocking portion 330 in the infrared cut filter 300. incident can be effectively prevented.

In the above, the configuration and characteristics of the present invention have been described based on the embodiments according to the present invention, but the present invention is not limited thereto, and various changes or modifications can be made within the spirit and scope of the present invention. It is apparent to those skilled in the art, and therefore such changes or modifications are intended to fall within the scope of the appended claims.

100: lens assembly
110: lens array
200: housing
300: infrared cut filter
330: light blocking unit
400: image sensor module

Claims (18)

It includes a plurality of lens arrays arranged in order from the object side toward the image side;
Each lens array includes a plurality of lenses,
Each of the plurality of lenses included in the lens array disposed closest to the image side has a length in a first axis direction perpendicular to the optical axis and a length in a second axis direction perpendicular to both the optical axis and the first axis direction. longer lens assemblies.
According to claim 1,
The plurality of lens arrays include a first lens array and a second lens array,
A protrusion is disposed on one of the first lens array and the second lens array, and a groove is disposed on the other one,
A lens assembly in which the protruding portion and the groove portion contact and are coupled.
According to claim 2,
The surface of the protrusion and the groove facing each other in a direction perpendicular to the optical axis is an inclined curved surface.
According to claim 3,
The protrusion is a truncated cone-shaped lens assembly.
According to claim 3,
A lens assembly having a shape in which a diameter of each of the protrusion and the groove gradually decreases in a direction from the protrusion toward the groove.
According to claim 3,
A lens assembly having a height of the protrusion greater than a depth of the groove.
According to claim 2,
The protruding portion and the groove portion are each positioned within an area surrounded by the plurality of lenses.
According to claim 1,
The plurality of lenses included in the lens array disposed closest to the image side have a straight line shape when side surfaces facing in the second axis direction are viewed in the optical axis direction.
According to claim 1,
Each of the plurality of lenses included in the lens array disposed closest to the image side has a ratio of a length in the second axial direction to a length in the first axial direction having a value greater than 0.5 and less than 1. .
According to claim 1,
A lens assembly, wherein each of the plurality of lenses included in the lens array disposed adjacent to the lens array disposed closest to the image side has a length in the first axial direction longer than a length in the second axial direction.
According to claim 1,
A lens assembly in which each of the plurality of lenses included in the lens array disposed closest to the object side has a convex object side surface.
According to claim 11,
The plurality of lenses included in the lens array disposed closest to the object side each have a positive refractive power.
a plurality of lens modules each including a plurality of lenses and disposed adjacent to each other;
a housing accommodating the plurality of lens modules; and
An image sensor module coupled to the housing and having one image sensor; includes,
The image sensor has a long side extending in a first axis direction perpendicular to the optical axis and a short side extending in a second axis direction perpendicular to both the optical axis and the first axis direction,
Among the plurality of lenses included in each lens module, lenses disposed closest to the image side have a length in the first axis direction longer than a length in the second axis direction.
According to claim 13,
The lenses disposed closest to the image side,
At least one of the side surfaces facing the first axis direction and the second axis direction has a straight line shape when viewed from the optical axis direction.
According to claim 13,
The lenses disposed closest to the image side,
Including an optical portion and a flange portion extending from the optical portion,
When the optical unit is viewed from the optical axis direction,
A first edge having an arc shape, a second edge provided on the opposite side of the first edge with respect to the optical axis and having an arc shape, and a third edge and a fourth edge connecting the first edge and the second edge. A camera module comprising a.
According to claim 15,
At least one of the third edge and the fourth edge has a straight line shape when viewed from the optical axis direction.
According to claim 13,
The lenses arranged to face the lenses disposed closest to the image side have a length in the first axis direction that is longer than a length in the second axis direction.
According to claim 13,
It further includes; an infrared cut-off filter disposed between the plurality of lens modules and the image sensor,
The infrared cut filter includes a light blocking part disposed on at least one of a surface facing the lens module and a surface facing the image sensor;
The camera module of claim 1 , wherein the light blocking unit divides the infrared cut filter into a plurality of regions corresponding to the number of the plurality of lens barrels.

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