KR20230000129A - Optical system and camera module inclduing the same - Google Patents

Abstract

Embodiments of the present invention provide an optical system with improved optical characteristics. The optical system according to an embodiment comprises first to fourth lens groups arranged along an optical axis from an object side to a sensor side, and each including one or more lenses. The first lens group has a refractive power opposite to that of the fourth lens group, the second lens group has a refractive power opposite to that of the third lens group, the first and fourth lens groups are fixed, the second and third lens groups are movable along the optical axis, at least one of the first and fourth lens groups includes at least one non-circular lens whose effective area has a non-circular shape, and at least one of the second and third lens groups includes at least one non-circular lens whose effective area has a non-circular shape. The non-circular lens has a non-circularity (CH/CA) greater than 0.6, the non-circularity (CH/CA) may be the ratio between the minimum clear height (CH) and the maximum clear aperture (CA) of a lens surface with a greater clear aperture (CA) among a surface toward the object side and a surface toward the sensor side of the non-circular lens.

Description

Optical system and camera module including the same {OPTICAL SYSTEM AND CAMERA MODULE INCLDUING THE SAME}

The embodiment relates to an optical system for improved optical performance and a camera module including the same.

The camera module performs a function of photographing an object and storing it as an image or video and is installed in various applications. In particular, the camera module is manufactured in a small size and is applied to portable devices such as smartphones, tablet PCs, and laptops, as well as drones and vehicles, providing various functions.

For example, the optical system of the camera module may include an imaging lens that forms an image and an image sensor that converts the formed image into an electrical signal. At this time, the camera module may perform an autofocus (AF) function of aligning the focal length of the lens by automatically adjusting the distance between the image sensor and the imaging lens, and a distant object through a zoom lens It is possible to perform a zooming function of zooming up or zooming out by increasing or decreasing the magnification of . In addition, the camera module employs an image stabilization (IS) technology to correct or prevent image stabilization due to camera movement caused by an unstable fixing device or a user's movement.

The most important element for such a camera module to acquire an image is an imaging lens that forms an image. Recently, interest in high resolution is increasing, and research on an optical system including a plurality of lenses is being conducted to implement this. For example, research using a plurality of imaging lenses having positive (+) refractive power or negative (-) refractive power is being conducted to implement high resolution.

However, when a plurality of lenses are included, it is difficult to derive excellent optical characteristics and aberration characteristics. In addition, when a plurality of lenses are included, the total length, height, etc. may increase due to the thickness, spacing, size, etc. of the plurality of lenses, thereby increasing the overall size of the module including the plurality of lenses. there is

In addition, the size of an image sensor is increasing to implement high resolution and high image quality. However, when the size of the image sensor increases, the total track length (TTL) of an optical system including a plurality of lenses also increases, and as a result, the thickness of a camera, mobile terminal, etc. including the optical system also increases.

In addition, when the optical system includes a plurality of lenses, the position of at least one lens or a lens group including at least one lens may be controlled to perform zoom and autofocus (AF) functions. However, when the lens or the lens group performs the function, the movement amount of the lens or the lens group may increase exponentially. Accordingly, the optical system may require a lot of energy for moving the lens or the lens group, and a large volume is required in consideration of the movement amount.

In addition, when the lens or the lens group is moved, there is a problem in that aberration characteristics according to the movement are deteriorated. Accordingly, there is a problem in that optical characteristics are deteriorated at a specific magnification when zoom and autofocus (AF) functions are performed.

Therefore, a new optical system capable of solving the above problems is required.

Embodiments are intended to provide an optical system with improved optical properties.

In addition, embodiments are intended to provide an optical system and a camera module capable of taking pictures at various magnifications.

In addition, embodiments are intended to provide an optical system and a camera module having improved aberration characteristics at various magnifications.

In addition, embodiments are intended to provide an optical system and a camera module that can be implemented in a small and compact manner.

An optical system according to an embodiment is disposed along an optical axis from an object side to a sensor side, and includes first to fourth lens groups each including at least one lens, the first lens group and the fourth lens group. The second lens group has an opposite refractive power to that of the third lens group, the first and fourth lens groups are fixed, and the second and third lens groups move in the optical axis direction. It is possible, wherein at least one lens group of the first and fourth lens groups includes at least one non-circular lens having an effective area having a non-circular shape, and at least one lens group of the second and third lens groups includes at least one non-circular lens whose effective area has a non-circular shape, the non-circular lens has a non-circularity (CH/CA) greater than 0.6, and the non-circularity is the object-side surface of the non-circular lens and It may be a ratio of a minimum clear height (CH) and a maximum clear aperture (CA) of a lens surface having a large clear aperture (CA) size among sensor sides.

In addition, the first lens group includes first to third lenses sequentially disposed along the optical axis in a direction from the object side to the sensor side, and the second lens group is arranged in a direction from the object side to the sensor side. fourth and fifth lenses sequentially disposed along the optical axis, and the third lens group includes sixth and seventh lenses sequentially disposed along the optical axis in a direction from the object side to the sensor side; , The fourth lens group may include an eighth lens.

In addition, the first lens may have a non-circular shape, and the non-circularity of the first lens may be greater than 0.6 and less than 1.

Also, among the first to eighth lenses, the non-circularity of the first lens may be the smallest.

In addition, the seventh lens may have a non-circular shape, and the non-circularity of the seventh lens may be greater than 0.7 and less than 1.

Also, among the fourth to seventh lenses, the seventh lens may have the smallest non-circularity.

Also, the first lens may have a meniscus shape convex from the optical axis toward the object side.

In addition, all of the first to eighth lenses may have a non-circular shape.

Also, an effective area of the object-side surface of the third lens may have a non-circular shape, and an effective area of the sensor-side surface may have a circular shape.

In addition, the optical system according to the embodiment is disposed along an optical axis from the object side to the sensor side, and includes first to fourth lens groups each including at least one lens, wherein the first lens group is the fourth lens group. group, the second lens group has a refractive power opposite to that of the third lens group, the first and fourth lens groups are fixed, and the second and third lens groups are aligned in the optical axis direction. It is movable, and at least one lens group of the first and fourth lens groups includes at least one non-circular lens having an effective area having a non-circular shape, and at least one lens of the second and third lens groups The group includes at least one non-circular lens having an effective area having a non-circular shape, and has a first effective focal length (EFL) when the second and third lens groups are located at the first position. , When the second and third lens groups are positioned at a second position different from the first position, they may have a second effective focal length, and the second effective focal length may be greater than the first effective focal length.

In addition, at the first position, the optical system may have a first magnification, and at the second position, the optical system may have a second magnification greater than the first magnification.

In addition, the optical system may satisfy the following equation.

0.05 < m_G2 / TTL < 0.35

(m_G2 is a movement distance when the second lens group moves from the first position to the second position or from the second position to the first position. In addition, TTL (Total track length) is the first It is the distance on the optical axis from the object side surface of the lens closest to the object in the lens group to the image surface of the sensor.)

In addition, the optical system may satisfy the following equation.

0.05 < m_G3 / TTL < 0.35

(m_G3 is a movement distance when the third lens group moves from the first position to the second position or from the second position to the first position. In addition, TTL (Total track length) is the first It is the distance on the optical axis from the object side surface of the lens closest to the object in the lens group to the image surface of the sensor.)

In addition, the first magnification is the lowest magnification of the optical system and the second magnification is the highest magnification of the optical system, and when the second and third lens groups are located at the first position, the F-number of the optical system is 3.5. or less, and when the second and third lens groups are positioned at the second position, the F-number of the optical system may be less than 6.

In addition, when the second and third lens groups move from the first position to the second position or from the second position to the first position, the movement distance of each of the second and third lens groups may be 6 mm or less. can

Also, the camera module according to the embodiment includes the optical system and a driving member, and the driving member may control positions of the second and third lens groups.

The optical system and the camera module according to the embodiment may have various magnifications and may have excellent optical characteristics when providing various magnifications. In detail, the embodiment may include a plurality of lens groups including at least one lens, and some of the plurality of lens groups may be provided to be fixed and the rest to be movable. At this time, the embodiment can have various magnifications by controlling the moving distance of the moving lens group and can provide an autofocus (AF) function for the subject.

In addition, the optical system and the camera module according to the embodiment may correct aberration characteristics of a plurality of lens groups or mutually supplement aberration characteristics that change due to movement. Accordingly, the optical system according to the embodiment can minimize or prevent a change in chromatic aberration and a change in aberration characteristics occurring when magnification is changed.

In addition, the optical system and camera module according to the embodiment may control the effective focal length (EFL) by moving only some of the plurality of lens groups, and may minimize the moving distance of the moving lens group. Accordingly, the optical system can reduce the moving distance of the lens group moving according to the operation mode change, and can minimize the power consumption required when moving the lens group.

Also, in the optical system, at least one lens included in the fixed group and the moving group may have a non-circular shape. Accordingly, the height of the optical system may be reduced while maintaining optical performance, and a space in which a lens group disposed between a plurality of lens groups may be structurally disposed may be secured.

In addition, the optical system and camera module according to the embodiment may adjust magnification by moving a lens group other than the first lens group adjacent to the subject among the plurality of lens groups. Accordingly, the optical system can have a constant TTL value even when the lens group moves according to the magnification change. Accordingly, the optical system and the camera module including the optical system may be provided with a slimmer structure.

1 is a configuration diagram of an optical system according to an embodiment operating in a first mode.
2 is a view for explaining a lens having a non-circular shape.
3 is a graph of a diffraction MTF (Diffraction MTF) of an optical system operating in a first mode.
4 is a graph showing aberration characteristics of an optical system operating in a first mode.
5 is a configuration diagram of an optical system according to an embodiment operating in a second mode.
6 is a graph of a diffraction MTF (Diffraction MTF) of an optical system operating in a second mode.
7 is a graph showing aberration characteristics of an optical system operating in a second mode.
8 is a configuration diagram of an optical system according to an embodiment operating in a third mode.
9 is a graph of a diffraction MTF (Diffraction MTF) of an optical system operating in a third mode.
10 is a graph showing aberration characteristics of an optical system operating in a third mode.
11 is a diagram illustrating that a camera module according to an embodiment is applied to a mobile terminal.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in a variety of different forms, and if it is within the scope of the technical idea of the present invention, one or more of the components among the embodiments can be selectively selected. can be used by combining and substituting.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, can be generally understood by those of ordinary skill in the art to which the present invention belongs. It can be interpreted as meaning, and commonly used terms, such as terms defined in a dictionary, can be interpreted in consideration of contextual meanings of related technologies.

Also, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when described as "at least one (or more than one) of A and (and) B and C", A, B, and C are combined. may include one or more of all possible combinations.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the term is not limited to the nature, order, or order of the corresponding component. And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected to, combined with, or connected to the other component, but also with the component. It may also include the case of being 'connected', 'combined', or 'connected' due to another component between the other components.

In addition, when it is described as being formed or disposed on the "top (above) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is not only a case where two components are in direct contact with each other, but also one A case in which another component above is formed or disposed between two components is also included. In addition, when expressed as "up (up) or down (down)", it may include not only an upward direction but also a downward direction based on one component.

In addition, the convex surface of the lens may mean that the lens surface of the region corresponding to the optical axis in the optical axis has a convex shape, and the concave surface of the lens means that the lens surface of the region corresponding to the optical axis has a concave shape. that can mean

In addition, the "object-side surface" may mean the surface of the lens facing the object side based on the optical axis, and the "sensor-side surface" may mean the surface of the lens facing the imaging surface (image sensor) based on the optical axis. .

Also, the central thickness of the lens may mean a thickness in an optical axis direction of the lens in an optical axis.

In addition, the vertical direction may mean a direction perpendicular to the optical axis, and the end of the lens or lens surface may mean the end of an effective area of the lens through which incident light passes.

In addition, the size of the effective mirror of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method.

1 is a configuration diagram of an optical system according to an embodiment operating in a first mode, and FIG. 2 is a diagram for explaining a lens having a non-circular shape. 3 and 4 are graphs of diffraction MTF (Diffraction MTF) of the optical system operating in the first mode and graphs showing aberration characteristics.

5 is a configuration diagram of an optical system according to an embodiment operating in the second mode, and FIGS. 6 and 7 are graphs showing diffraction MTF and aberration characteristics of the optical system operating in the second mode.

8 is a configuration diagram of an optical system according to an embodiment operating in the third mode, and FIGS. 9 and 10 are graphs showing diffraction MTF and aberration characteristics of the optical system operating in the third mode.

Referring to FIGS. 1 to 10 , an optical system 1000 according to an embodiment may include a plurality of lens groups. In detail, the optical system 1000 may include a plurality of lens groups including at least one lens. For example, the optical system 1000 includes a first lens group G1, a second lens group G2, a third lens group G3 and A fourth lens group G4 may be included.

Each of the first to fourth lens groups G1, G2, G3, and G4 may have positive (+) or negative (-) refractive power.

The first lens group G1 may have refractive power opposite to that of the second lens group G2. For example, the first lens group G1 may have negative (-) refractive power, and the second lens group G2 may have positive (+) refractive power. Also, the second lens group G2 may have a refractive power opposite to that of the third lens group G3. For example, the second lens group G2 may have positive (+) refractive power, and the third lens group G3 may have negative (-) refractive power. Also, the third lens group G3 may have refractive power opposite to that of the fourth lens group G4. For example, the third lens group G3 may have negative (-) refractive power, and the fourth lens group G4 may have positive (+) refractive power.

The first lens group G1 and the second lens group G2 may have different focal lengths. In detail, as the first and second lens groups G1 and G2 have opposite refractive powers as described above, the focal length of the second lens group G2 is the focal length of the first lens group G1. can have signs (+, -) opposite to For example, the focal length of the first lens group G1 may have a positive (+) sign, and the focal length of the second lens group G2 may have a negative (-) sign.

Also, the second lens group G2 and the third lens group G3 may have different focal lengths. In detail, as the second and third lens groups G2 and G3 have opposite refractive powers as described above, the focal length of the second lens group G2 is the focal length of the third lens group G3. can have signs (+, -) opposite to For example, the focal length of the second lens group G2 may have a negative (-) sign, and the focal length of the third lens group G3 may have a positive (+) sign.

Also, the third lens group G3 and the fourth lens group G4 may have different focal lengths. In detail, as the third and fourth lens groups G3 and G4 have opposite refractive powers as described above, the focal length of the third lens group G3 is the focal length of the fourth lens group G4. can have signs (+, -) opposite to For example, the focal length of the third lens group G3 may have a positive (+) sign, and the focal length of the fourth lens group G4 may have a negative (-) sign.

At this time, the absolute value of the focal length of each of the first to fourth lens groups G1, G2, G3, and G4 is the first lens group G1, the fourth lens group G4, and the third lens group. It may have a large value in the order of (G3) and the second lens group (G2).

In the optical system 1000 , at least one lens group among the first to fourth lens groups G1 , G2 , G3 , and G4 may be provided to be movable in the direction of the optical axis OA. In detail, at least one of the plurality of lens groups G1 , G2 , G3 , and G4 may be provided to be movable, and the remaining lens groups may be fixed. For example, among the plurality of lens groups G1 , G2 , G3 , and G4 , the first lens group G1 and the fourth lens group G4 may be disposed at fixed positions, and the second lens group G4 may be disposed at a fixed location. The group G2 and the third lens group G3 may be provided to be movable in the direction of the optical axis OA. Accordingly, the optical system 1000 may provide various magnifications by moving the lens group.

Hereinafter, the first to fourth lens groups G1, G2, G3, and G4 will be described in more detail.

The first lens group G1 may include at least one lens. The first lens group G1 may include a plurality of lenses. In detail, the first lens group G1 may include two or more lenses having refractive powers opposite to each other. For example, the first lens group G1 may include three lenses.

A plurality of lenses included in the first lens group G1 may have set intervals. In detail, the distance between the plurality of lenses included in the first lens group G1 may be constant without changing even when an operation mode to be described later changes. For example, the distance between the first lens 110 and the second lens 120 and the distance between the second lens 120 and the third lens 130 are constant without changing according to the operation mode. can do. Here, the distance between the plurality of lenses may mean the distance between adjacent lenses on the optical axis.

The second lens group G2 may include at least one lens. The second lens group G2 may include a plurality of lenses. In detail, the second lens group G2 may include two or more lenses having refractive powers opposite to each other. The number of lenses included in the second lens group G2 may be less than the number of lenses included in the first lens group G1. For example, the second lens group G2 may include two lenses.

A plurality of lenses included in the second lens group G2 may have set intervals. In detail, the distance between the plurality of lenses included in the second lens group G2 may be constant without changing even when an operation mode, which will be described later, changes. For example, the interval between the fourth lens 140 and the fifth lens 150 may be constant without changing according to the operation mode.

The third lens group G3 may include at least one lens. The third lens group G3 may include a plurality of lenses. In detail, the third lens group G3 may include two or more lenses having refractive powers opposite to each other. The number of lenses included in the third lens group G3 may be less than the number of lenses included in the first lens group G1. Also, the number of lenses included in the third lens group G3 may be the same as the number of lenses included in the second lens group G2. For example, the third lens group G3 may include two lenses.

A plurality of lenses included in the third lens group G3 may have set intervals. In detail, the distance between the plurality of lenses included in the third lens group G3 may be constant without changing even when an operation mode, which will be described later, changes. For example, the distance between the sixth lens 160 and the seventh lens 170 may be constant without changing according to the operation mode.

The fourth lens group G4 may include at least one lens. The number of lenses included in the fourth lens group G4 may be less than the number of lenses included in the first lens group G1. Also, the number of lenses included in the fourth lens group G4 may be less than or equal to the number of lenses included in the second lens group G2 and the third lens group G3. For example, the fourth lens group G4 may include one lens.

Lenses included in the fourth lens group G4 may have set intervals. In detail, the distance between the lens included in the fourth lens group G4 and the image sensor 300 may be constant without changing in an operation mode to be described later. Also, when the fourth lens group G4 includes a plurality of lenses, the distance between the plurality of lenses may be constant without changing even when the operation mode is changed.

That is, the optical system 1000 may include a plurality of lens groups G1 , G2 , G3 , and G4 sequentially arranged from the object side toward the sensor and the image sensor 300 . In addition, the optical system 1000 includes a plurality of lenses 100 included in the lens groups G1, G2, G3, and G4, for example, the first to eighth lenses 110, 120, 130, and 140 , 150, 160, 170, 180). In this case, the first lens group G1 may include the first to third lenses 110, 120, and 130, and the second lens group G2 may include the fourth and fifth lenses 140. , 150). Also, the third lens group G3 may include the sixth and seventh lenses 160 and 170, and the fourth lens group G4 may include the eighth lens 180. . The first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 and the image sensor 300 may be sequentially disposed along the optical axis OA of the optical system 1000. .

Each of the plurality of lenses 100 may include an effective area and an ineffective area. The effective area may be an area through which light incident to each of the first to eighth lenses 110 , 120 , 130 , 140 , 150 , 160 , 170 , and 180 passes. That is, the effective area may be an area in which the incident light is refracted to implement optical characteristics.

The non-effective area may be arranged around the effective area. The ineffective area may be an area in which the light is not incident. That is, the non-effective area may be an area unrelated to the optical characteristics. Also, the non-effective area may be an area fixed to a barrel (not shown) accommodating the lens.

The optical system 1000 may include an image sensor 300 . The image sensor 300 may detect light. The image sensor 300 transmits light sequentially passing through the plurality of lenses 100, for example, the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180. can detect The image sensor 300 may include a Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (CMOS).

In addition, the optical system 1000 may further include a filter 500 . The filter 500 may be disposed between the plurality of lenses 100 and the image sensor 300 . The filter 500 may be disposed between the image sensor 300 and the fourth lens group G4 closest to the image sensor 300 among the plurality of lens groups G1 , G2 , G3 , and G4 . there is. For example, the filter 500 may be disposed between the image sensor 300 and the eighth lens 180 of the fourth lens group G4.

The filter 500 may include at least one of an infrared filter and an optical filter such as a cover glass. The filter 500 may pass light of a set wavelength band and filter light of a different wavelength band. When the filter 500 includes an infrared filter, radiant heat emitted from external light may be blocked from being transferred to the image sensor 300 . In addition, the filter 500 may transmit visible light and reflect infrared light.

The optical system 1000 may include an aperture (not shown). The diaphragm may control the amount of light incident to the optical system 1000 .

The diaphragm may be located in front of the first lens 110 or between two lenses selected from among the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180. there is. For example, the diaphragm may be disposed between the third lens 130 and the fourth lens 140 . In addition, at least one lens among the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 may function as a diaphragm. For example, an object-side surface or a sensor-side surface of one lens selected from among the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 serves as an aperture to adjust the amount of light. can be performed. For example, at least one lens surface of the sensor-side surface (sixth surface S6) of the third lens 130 and the object-side surface (seventh surface S7) of the fourth lens 140 is It can serve as an aperture.

The optical system 1000 may further include a light path changing member (not shown).

The light path changing member may change a path of light by reflecting light incident from the outside. The light path changing member may include a reflector or a prism. For example, the light path changing member may include a right angle prism. When the light path changing member includes a right angle prism, the light path changing member may change the path of light by reflecting the path of incident light at an angle of 90 degrees.

The light path changing member may be disposed closer to the object side than the plurality of lenses 100 . That is, when the optical system 1000 includes the light path changing member, the light path changing member from the object side toward the sensor, the first lens 110, the second lens 120, the third lens 130, The fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, the eighth lens 180, the filter 500, and the image sensor 300 may be arranged in this order. there is.

The light path changing member may change a path of light incident from the outside in a set direction. For example, the light path changing member directs a path of light incident to the light path changing member in a first direction in a second direction, which is the arrangement direction of the plurality of lenses 100 (the plurality of lenses 100 are spaced apart from each other). direction) can be changed to the optical axis (OA) direction of the drawing).

When the optical system 1000 includes a light path changing member, the optical system can be applied to a folded camera, and the thickness of the camera can be reduced. In detail, when the optical system 1000 includes the light path changing member, light incident in a direction (first direction) perpendicular to the surface of the device to which the optical system 1000 is applied is directed in a direction parallel to the surface of the device. (second direction). Accordingly, the optical system 1000 including the plurality of lenses 100 may have a thinner thickness within the device, and thus the height of the device may decrease.

For example, when the optical system 1000 does not include the light path changing member, the plurality of lenses 100 extend in a direction (first direction) perpendicular to the surface of the device in the device, can be placed. Accordingly, the optical system 1000 including the plurality of lenses 100 has a high height in a direction (first direction) perpendicular to the surface of the device, and as a result, the optical system 1000 and the device including the same It may be difficult to form a thin thickness of.

However, when the optical system 1000 includes the light path changing member, the plurality of lenses 100 may be arranged to extend in a direction (second direction) parallel to the surface of the device. That is, the optical system 1000 is arranged so that the optical axis OA is parallel to the surface of the device and can be applied to a folded camera. Accordingly, the optical system 1000 including the plurality of lenses 100 may have a low height in a direction perpendicular to the surface of the device. Accordingly, the camera including the optical system 1000 may have a thin thickness within the device, and the thickness of the device may also be reduced.

In addition, the light path changing member is disposed between two lenses among the plurality of lenses 100, or between the last lens closest to the image sensor 300 and the image sensor 300 among the plurality of lenses 100. ) can be placed between

Also, the light path changing member may be provided in plural numbers. In detail, a plurality of light path changing members may be disposed between the object and the image sensor 300 . For example, the light path changing member includes a first light path changing member disposed closer to the object side than the plurality of lenses 100 and a second light disposed between the last lens and the image sensor 300 . It may include a path changing member.

Accordingly, the optical system 1000 may have various shapes and heights depending on the camera to which it is applied, and may have improved optical performance.

Referring again to the plurality of lenses 100, the optical system 1000 includes first to eighth lenses 110, 120, 130, and 140 sequentially disposed along the optical axis OA from the object side toward the sensor. , 150, 160, 170, 180). The first lens 110 may be disposed closest to the object side among the plurality of lenses 100, and the eighth lens 180 may be disposed closest to the image sensor 300 side. there is.

The first lens 110 may have positive (+) refractive power along the optical axis OA. The first lens 110 may include a plastic or glass material. For example, the first lens 110 may be made of a plastic material.

The first lens 110 may include a first surface S1 defined as an object side surface and a second surface S2 defined as a sensor side surface. The first surface S1 may have a convex shape along the optical axis OA, and the second surface S2 may have a concave shape along the optical axis OA. That is, the first lens 110 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the first surface S1 may have a convex shape along the optical axis OA, and the second surface S2 may have a convex shape along the optical axis OA. That is, the first lens 110 may have a convex shape on both sides of the optical axis OA.

At least one of the first surface S1 and the second surface S2 may be an aspheric surface. For example, both the first surface S1 and the second surface S2 may be aspherical.

The second lens 120 may have positive (+) or negative (-) refractive power on the optical axis OA. The second lens 120 may include a plastic or glass material. For example, the second lens 120 may be made of a plastic material.

The second lens 120 may include a third surface S3 defined as an object side surface and a fourth surface S4 defined as a sensor side surface. The third surface S3 may have a convex shape along the optical axis OA, and the fourth surface S4 may have a concave shape along the optical axis OA. That is, the second lens 120 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the third surface S3 may have a convex shape along the optical axis OA, and the fourth surface S4 may have a convex shape. That is, the second lens 120 may have a convex shape on both sides of the optical axis OA. Alternatively, the third surface S3 may have a concave shape along the optical axis OA, and the fourth surface S4 may have a convex shape along the optical axis OA. That is, the second lens 120 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the third surface S3 may have a concave shape in the optical axis OA, and the fourth surface S4 may have a concave shape in the optical axis OA. That is, the second lens 120 may have a concave shape on both sides of the optical axis OA.

At least one of the third and fourth surfaces S3 and S4 may be an aspherical surface. For example, both the third surface S3 and the fourth surface S4 may be aspheric surfaces.

The third lens 130 may have refractive power opposite to that of the first lens 110 in the optical axis OA. That is, the third lens 130 may have negative (-) refractive power. The third lens 130 may include a plastic or glass material. For example, the third lens 130 may be made of a plastic material.

The third lens 130 may include a fifth surface S5 defined as an object side surface and a sixth surface S6 defined as a sensor side surface. The fifth surface S5 may have a convex shape along the optical axis OA, and the sixth surface S6 may have a concave shape along the optical axis OA. That is, the third lens 130 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the fifth surface S5 may have a concave shape in the optical axis OA, and the sixth surface S6 may have a concave shape in the optical axis OA. That is, the third lens 130 may have a concave shape on both sides of the optical axis OA.

At least one of the fifth surface S5 and the sixth surface S6 may be an aspheric surface. For example, both the fifth surface S5 and the sixth surface S6 may be aspheric surfaces.

That is, the first lens 110 closest to the object in the first lens group G1 may have a refractive power opposite to that of the third lens 130 closest to the image sensor 300 . Accordingly, the first lens group G1 can compensate for chromatic aberration caused by the plurality of lenses 110, 120, and 130 included in the first lens group G1, and the optical system 1000 ) can control the light incident on it.

The fourth lens 140 may have positive (+) or negative (-) refractive power on the optical axis OA. The fourth lens 140 may include a plastic or glass material. For example, the fourth lens 140 may be made of a plastic material.

The fourth lens 140 may include a seventh surface S7 defined as an object side surface and an eighth surface S8 defined as a sensor side surface. The seventh surface S7 may have a convex shape along the optical axis OA, and the eighth surface S8 may have a concave shape along the optical axis OA. That is, the fourth lens 140 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the seventh surface S7 may be convex along the optical axis OA, and the eighth surface S8 may be convex along the optical axis OA. That is, the fourth lens 140 may have a convex shape on both sides of the optical axis OA.

At least one of the seventh surface S7 and the eighth surface S8 may be an aspheric surface. For example, both the seventh surface S7 and the eighth surface S8 may be aspheric surfaces.

The fifth lens 150 may have positive (+) or negative (-) refractive power along the optical axis OA. The fifth lens 150 may have refractive power opposite to that of the fourth lens 140 in the optical axis OA. The fifth lens 150 may include a plastic or glass material. For example, the fifth lens 150 may be made of a plastic material.

The fifth lens 150 may include a ninth surface S9 defined as an object side surface and a tenth surface S10 defined as a sensor side surface. The ninth surface S9 may have a convex shape along the optical axis OA, and the tenth surface S10 may have a concave shape along the optical axis OA. That is, the fifth lens 150 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the ninth surface S9 may have a convex shape along the optical axis OA, and the tenth surface S10 may have a convex shape along the optical axis OA. That is, the fifth lens 150 may have a convex shape on both sides of the optical axis OA. Alternatively, the ninth surface S9 may have a concave shape along the optical axis OA, and the tenth surface S10 may have a convex shape along the optical axis OA. That is, the fifth lens 150 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the ninth surface S9 may have a concave shape in the optical axis OA, and the tenth surface S10 may have a concave shape in the optical axis OA. That is, the fifth lens 150 may have a concave shape on both sides of the optical axis OA.

At least one of the ninth surface S9 and the tenth surface S10 may be an aspheric surface. For example, both the ninth surface S9 and the tenth surface S10 may be aspheric surfaces.

That is, the fourth lens 140 closest to the object in the second lens group G2 may have a refractive power opposite to that of the fifth lens 150 closest to the image sensor 300 . Also, a difference in Abbe numbers between the fourth lens 140 and the fifth lens 150 may be greater than 20. Accordingly, the change in chromatic aberration caused by the position of the second lens group G2 according to the mode change can be minimized.

The sixth lens 160 may have positive (+) or negative (-) refractive power along the optical axis OA. The sixth lens 160 may include a plastic or glass material. For example, the sixth lens 160 may be made of a plastic material.

The sixth lens 160 may include an eleventh surface S11 defined as an object side surface and a twelfth surface S12 defined as a sensor side surface. The eleventh surface S11 may have a convex shape along the optical axis OA, and the twelfth surface S12 may have a concave shape along the optical axis OA. That is, the sixth lens 160 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the eleventh surface S11 may have a convex shape along the optical axis OA, and the twelfth surface S12 may have a convex shape along the optical axis OA. That is, the sixth lens 160 may have a convex shape on both sides of the optical axis OA. Alternatively, the eleventh surface S11 may have a concave shape along the optical axis OA, and the twelfth surface S12 may have a convex shape along the optical axis OA. That is, the sixth lens 160 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the eleventh surface S11 may have a concave shape in the optical axis OA, and the twelfth surface S12 may have a concave shape in the optical axis OA. That is, the sixth lens 160 may have a concave shape on both sides of the optical axis OA.

At least one of the eleventh surface S11 and the twelfth surface S12 may be an aspheric surface. For example, both the eleventh surface S11 and the twelfth surface S12 may be aspherical surfaces.

The seventh lens 170 may have positive (+) or negative (-) refractive power along the optical axis OA. The seventh lens 170 may have refractive power opposite to that of the sixth lens 160 in the optical axis OA. The seventh lens 170 may include a plastic or glass material. For example, the seventh lens 170 may be made of a plastic material.

The seventh lens 170 may include a thirteenth surface S13 defined as an object side surface and a fourteenth surface S14 defined as a sensor side surface. The thirteenth surface S13 may have a convex shape along the optical axis OA, and the fourteenth surface S14 may have a concave shape along the optical axis OA. That is, the seventh lens 170 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the thirteenth surface S13 may have a convex shape along the optical axis OA, and the fourteenth surface S14 may have a convex shape along the optical axis OA. That is, the seventh lens 170 may have a convex shape on both sides of the optical axis OA. Alternatively, the thirteenth surface S13 may have a concave shape along the optical axis OA, and the fourteenth surface S14 may have a convex shape along the optical axis OA. That is, the seventh lens 170 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the thirteenth surface S13 may have a concave shape in the optical axis OA, and the fourteenth surface S14 may have a concave shape in the optical axis OA. That is, the seventh lens 170 may have a concave shape on both sides of the optical axis OA.

At least one of the thirteenth surface S13 and the fourteenth surface S14 may be an aspheric surface. For example, both the thirteenth surface S13 and the fourteenth surface S14 may be aspheric surfaces.

That is, the sixth lens 160 closest to the object in the third lens group G3 may have a refractive power opposite to that of the seventh lens 170 closest to the image sensor 300 . Also, a difference in Abbe numbers between the sixth lens 160 and the seventh lens 170 may be greater than 20. Accordingly, the change in chromatic aberration caused by the position of the third lens group G3 according to the mode change can be minimized.

The eighth lens 180 may have positive (+) refractive power along the optical axis OA. The eighth lens 180 may include a plastic or glass material. For example, the eighth lens 180 may be made of a plastic material.

The eighth lens 180 may include a fifteenth surface S15 defined as an object side surface and a sixteenth surface S16 defined as a sensor side surface. The fifteenth surface S15 may have a convex shape along the optical axis OA, and the sixteenth surface S16 may have a concave shape along the optical axis OA. That is, the eighth lens 180 may have a meniscus shape convex from the optical axis OA toward the object side. Alternatively, the fifteenth surface S15 may have a convex shape along the optical axis OA, and the sixteenth surface S16 may have a convex shape along the optical axis OA. That is, the eighth lens 180 may have a convex shape on both sides of the optical axis OA. Alternatively, the eighth lens 180 may have a concave shape along the optical axis OA, and the sixteenth surface S16 may have a convex shape along the optical axis OA. That is, the eighth lens 180 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the fifteenth surface S15 may have a concave shape in the optical axis OA, and the sixteenth surface S16 may have a concave shape in the optical axis OA. That is, the eighth lens 180 may have a concave shape on both sides of the optical axis OA.

At least one of the fifteenth surface S15 and the sixteenth surface S16 may be an aspheric surface. For example, both the fifteenth surface S15 and the sixteenth surface S16 may be aspheric surfaces.

That is, the fourth lens group G4 may be closest to the image sensor 300 among the plurality of lens groups G1 , G2 , G3 , and G4 . In particular, the eighth lens 180 closest to the image sensor 300 may have the shortest light movement path among the plurality of lenses 100 . The fourth lens group G4 may serve to control a chief ray angle (CRA). In detail, the CRA of the optical system 1000 according to the embodiment may be less than about 10 degrees, and the eighth lens 180 of the fourth lens group G4 is a chief ray of light incident on the image sensor 300. The incident angle (Chief Ray Angle, CRA) can be corrected so that it approaches 0 degree.

At least one lens of the plurality of lenses 100 may have a non-circular shape. The non-circular lens will be described with reference to FIG. 2 .

Referring to FIG. 2 , a lens may include an object-side surface and a sensor-side surface, and at least one of the two lens surfaces of the lens may have a non-circular shape.

For example, the effective area of the lens surface may include first to fourth corners A1, A2, A3, and A4.

The first corner A1 and the second corner A2 may be corners facing each other in a first direction perpendicular to the optical axis OA (x-axis direction in FIG. 2 ). The first edge A1 and the second edge A2 may have a curved shape. The first edge A1 and the second edge A2 may be provided in a curved shape having the same length and curvature. That is, the first edge A1 and the second edge A2 pass through the optical axis OA and have a symmetrical shape based on an imaginary line extending in the second direction (y-axis direction in FIG. 2). can

Also, the third corner A3 and the fourth corner A4 may be corners facing each other in a second direction (y-axis direction in FIG. 2 ) perpendicular to the optical axis OA and the first direction. The third edge A3 and the fourth edge A4 may be edges connecting ends of the first edge A1 and the second edge A2. The third edge A3 and the fourth edge A4 may have a straight line shape. The third edge A3 and the fourth edge A4 may have the same length and be parallel to each other. That is, the third edge A3 and the fourth edge A4 have a symmetrical shape based on an imaginary line passing through the optical axis OA and extending in a first direction (x-axis direction in FIG. 2 ). can

The lens surface of the lens may have a non-circular shape, for example, a D-cut shape, as it includes the first to fourth corners A1 , A2 , A3 , and A4 described above.

The lens surface of the non-circular shape may have a lens manufacturing process. For example, when the lens is made of a plastic material, it may be manufactured into the aforementioned non-circular shape during an injection process. Alternatively, the lens may be manufactured in a circular shape through an injection process, and in a subsequent cutting process, a partial region of the lens may be cut to have the third and fourth edges A3 and A4.

Accordingly, the effective area of the lens surface may have a set size. For example, a length CA of an imaginary first straight line passing through the optical axis OA and connecting the first and second corners A1 and A2 passes through the optical axis OA and connects the first and second edges A1 and A2. It may be longer than the length CH of an imaginary second straight line connecting the four corners A3 and A4. Here, the length CA of the first straight line may mean the size of the maximum effective diameter of the lens surface (Clear Aperture, CA), and the length of the second straight line CH may mean the size of the minimum effective diameter of the lens surface (Clear Aperture, CA). Clear Height, CH). Also, when the effective area of the lens surface has a circular shape rather than a non-circular shape, the maximum effective diameter CA and the minimum effective diameter CH of the lens surface may be equal to each other.

At least one lens among the plurality of lenses 100 according to the embodiment may have a non-circular shape.

At least one lens among the first to third lenses 110, 120, and 130 included in the first lens group G1 may have a non-circular shape.

For example, the first lens 110 may have a non-circular shape. At least one lens surface of the first surface S1 and the second surface S2 of the first lens 110 may have a non-circular shape. In detail, each effective area of the first surface S1 and the second surface S2 may have a non-circular shape.

The first lens 110 may have a non-circularity smaller than 1. Here, the non-circularity of the first lens 110 is the size of the effective mirror CA among the object side surface (first surface S1) and the sensor side surface (second surface S2) of the first lens 110. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the first lens 110 according to the embodiment, the first surface S1 may have a larger effective diameter than the second surface S2. The non-circularity of the first lens 110 may be greater than 0.6 and less than 1. If the non-circularity of the first lens 110 is less than 0.6, the height of the first lens 110 may be reduced to have a slim structure, but the area of the effective area lost due to the non-circular shape increases, Performance may deteriorate. In addition, when the non-circularity of the first lens 110 is 1 or greater than 1, it has a circular shape, and it may be difficult to derive an effect of reducing the height of the first lens 110. In addition, the non-circularity of the first surface S1 of the first lens 110 may be smaller than the non-circularity of the second surface S2.

Also, the second lens 120 may have a non-circular shape. At least one lens surface among the third and fourth surfaces S3 and S4 of the second lens 120 may have a non-circular shape. In detail, each effective area of the third and fourth surfaces S3 and S4 may have a non-circular shape.

The second lens 120 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the second lens 120 is the size of the effective mirror CA among the object-side surface (third surface S3) and the sensor-side surface (fourth surface S4) of the second lens 120. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the second lens 120 according to the embodiment, the third surface S3 may have a larger effective diameter than the fourth surface S4. The non-circularity of the second lens 120 may be greater than 0.6 and less than 1. If the non-circularity of the second lens 120 is less than 0.6, the height of the second lens 120 may be reduced to have a slim structure, but the area of the effective area lost by the non-circular shape increases, Performance may deteriorate. In addition, when the non-circularity of the second lens 120 is 1 or greater than 1, it has a circular shape, and it may be difficult to derive an effect of reducing the height of the second lens 120. In addition, the non-circularity of the third surface S3 of the second lens 120 may be smaller than the non-circularity of the fourth surface S4.

The non-circularity of the second lens 120 may be different from that of the first lens 110 . In detail, the non-circularity of the second lens 120 may be greater than that of the first lens 110 . For example, the non-circularity of the second lens 120 may have a greater non-circularity than that of the first lens 110 within a range of about 1.15 times or less than the non-circularity of the first lens 110 .

Also, the third lens 130 may have a non-circular shape. At least one of the fifth and sixth surfaces S5 and S6 of the third lens 130 may have a non-circular shape. In detail, the effective area of the fifth surface S5 may have a non-circular shape. Also, the effective area of the sixth surface S6 may have a circular shape, and the non-effective area of the sixth surface S6 may have a non-circular shape.

The third lens 130 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the third lens 130 is the size of the effective mirror CA among the object-side surface (fifth surface S5) and the sensor-side surface (sixth surface S6) of the third lens 130. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the third lens 130 according to the embodiment, the fifth surface S5 may have a larger effective diameter than the sixth surface S6. The non-circularity of the third lens 130 may be greater than 0.6. In detail, the non-circularity of the third lens 130 may be greater than 0.7 and less than 1. If the non-circularity of the third lens 130 is less than 0.7, the height of the third lens 130 may be reduced to have a slim structure, but the area of the effective area lost due to the non-circular shape increases, Performance may deteriorate. In addition, when the non-circularity of the third lens 130 is 1 or greater than 1, it has a circular shape, and it may be difficult to derive an effect of reducing the height of the third lens 130. In addition, the non-circularity of the fifth surface S5 of the third lens 130 may be smaller than that of the sixth surface S6.

The non-circularity of the third lens 130 may be different from that of the first lens 110 and the second lens 120 . In detail, the non-circularity of the third lens 130 may be greater than that of the first and second lenses 110 and 120 . For example, the non-circularity of the third lens 130 may be about 1.15 times or more than the non-circularity of the second lens 120 .

The first to third lenses 110, 120, and 130 included in the first lens group G1 may have a minimum effective diameter CH that is similar to each other. In detail, the minimum effective aperture sizes (CH) of each of the first to third lenses 110, 120, and 130 may have sizes corresponding to each other within a range of about 5% or less, and the difference between the minimum effective aperture sizes (CH) is It may be about 0.03 mm or less.

At least one of the fourth and fifth lenses 140 and 150 included in the second lens group G2 may have a non-circular shape.

For example, the fourth lens 140 may have a non-circular shape. At least one lens surface of the seventh surface S7 and the eighth surface S8 of the fourth lens 140 may have a non-circular shape. In detail, each effective area of the seventh surface S7 and the eighth surface S8 may have a non-circular shape.

The fourth lens 140 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the fourth lens 140 is the size of the effective mirror CA among the object side surface (seventh surface S7) and sensor side surface (eighth surface S8) of the fourth lens 140. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the fourth lens 140 according to the embodiment, the seventh surface S7 may have a larger effective diameter than the eighth surface S8. The non-circularity of the fourth lens 140 may be greater than 0.6. In detail, the non-circularity of the fourth lens 140 may be greater than 0.7 and less than 1. If the non-circularity of the fourth lens 140 is less than 0.7, the height of the fourth lens 140 may be reduced to have a slim structure, but the area of the effective area lost due to the non-circular shape increases and optical Performance may deteriorate. In addition, when the non-circularity of the fourth lens 140 is 1 or greater than 1, it has a circular shape, and it may be difficult to derive an effect of reducing the height of the fourth lens 140. In addition, the non-circularity of the seventh surface S7 of the fourth lens 140 may be smaller than that of the eighth surface S8.

Also, the fifth lens 150 may have a non-circular shape. At least one lens surface of the ninth surface S9 and the tenth surface S10 of the fifth lens 150 may have a non-circular shape. In detail, the ninth surface S9 and the tenth surface ( Each effective area of S10 may have a non-circular shape.

The fifth lens 150 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the fifth lens 150 is the size of the effective mirror CA among the object-side surface (ninth surface S9) and the sensor-side surface (tenth surface S10) of the fifth lens 150. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of the large lens surface.

In the fifth lens 150 according to the embodiment, the ninth surface S9 may have a larger effective diameter than the tenth surface S10. The non-circularity of the fifth lens 150 may be greater than 0.6. In detail, the non-circularity of the fifth lens 150 may be greater than 0.7 and less than 1. If the non-circularity of the fifth lens 150 is less than 0.7, the height of the fifth lens 150 is reduced to make it slim. Although it may have a structure, the area of the effective region lost by the non-circular shape may increase, and optical performance may deteriorate. In addition, when the non-circularity of the fifth lens 150 is 1 or greater than 1, the fifth lens 150 has a circular shape. Therefore, it may be difficult to derive an effect of reducing the height of the fifth lens 150. In addition, the non-circularity of the ninth surface S9 in the fifth lens 150 is equal to the tenth surface S10. may be less than the non-circularity of

The non-circularity of the fifth lens 150 may be different from that of the fourth lens 140 . In detail, the non-circularity of the fifth lens 150 may be greater than that of the fourth lens 140 . For example, the non-circularity of the fifth lens 150 may be about 1.05 times or more than the non-circularity of the fourth lens 140 .

The fourth and fifth lenses 140 and 150 included in the second lens group G2 may have similar minimum effective aperture sizes CH to each other. In detail, the minimum effective aperture sizes (CH) of the fourth and fifth lenses 140 and 150 may have sizes corresponding to each other within a range of about 5% or less, and the difference between the minimum effective aperture sizes (CH) is about 0.03 mm. may be below.

The minimum effective aperture size CH of the fourth and fifth lenses 140 and 150 included in the second lens group G2 is the first to third lenses included in the first lens group G1 ( 110, 120, 130) may be smaller than the minimum effective aperture size (CH). For example, the minimum effective aperture size CH of the lenses 140 and 150 included in the second lens group G2 is the minimum size of the lenses 110, 120 and 130 included in the first lens group G1. It may be about 85% or less of the effective diameter size (CH). In detail, the minimum effective diameter CH of the second lens group G2 may be about 70% to about 80% of the minimum effective diameter size of the first lens group G1.

When the minimum effective diameter CH of the second lens group G2 does not satisfy the aforementioned range, the second lens group ( It may be difficult to structurally secure a space for G2) to be placed. Also, it may be difficult for the second lens group G2 to secure a moving distance between the first lens group G1 and the fourth lens group G4 according to the operation mode.

At least one of the sixth and seventh lenses 160 and 170 included in the third lens group G3 may have a non-circular shape.

For example, the sixth lens 160 may have a non-circular shape. At least one lens surface of the eleventh surface S11 and the twelfth surface S12 of the sixth lens 160 may have a non-circular shape. In detail, the effective area of each of the eleventh and twelfth surfaces S11 and S12 may have a non-circular shape.

The sixth lens 160 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the sixth lens 160 is the size of the effective mirror CA among the object-side surface (eleventh surface S11) and the sensor-side surface (twelfth surface S12) of the sixth lens 160. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the sixth lens 160 according to the embodiment, the twelfth surface S12 may have a larger effective diameter than the eleventh surface S11. The non-circularity of the sixth lens 160 may be greater than 0.6. In detail, the non-circularity of the sixth lens 160 may be greater than 0.7 and less than 1. If the non-circularity of the sixth lens 160 is less than 0.7, the height of the sixth lens 160 may be reduced to have a slim structure, but the area of the effective area lost by the non-circular shape increases, Performance may deteriorate. In addition, when the non-circularity of the sixth lens 160 is 1 or greater than 1, it has a circular shape, and it may be difficult to derive an effect of reducing the height of the sixth lens 160. Also, in the sixth lens 160, the non-circularity of the eleventh surface S11 may be smaller than that of the twelfth surface S12.

Also, the seventh lens 170 may have a non-circular shape. At least one lens surface of the thirteenth surface S13 and the fourteenth surface S14 of the seventh lens 170 may have a non-circular shape. In detail, each effective area of the thirteenth surface S13 and the fourteenth surface S14 may have a non-circular shape.

The seventh lens 170 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the seventh lens 170 is the size of the effective mirror CA among the object side surface (the thirteenth surface S13) and the sensor side surface (the fourteenth surface S14) of the seventh lens 170. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the seventh lens 170 according to the embodiment, the fourteenth surface S14 may have a larger effective diameter than the thirteenth surface S13. The non-circularity of the seventh lens 170 may be greater than 0.6. In detail, the non-circularity of the seventh lens 170 may be greater than 0.7 and less than 1. If the non-circularity of the seventh lens 170 is less than 0.7, the height of the seventh lens 170 may be reduced to have a slim structure, but the area of the effective area lost due to the non-circular shape increases, Performance may deteriorate. In addition, when the non-circularity of the seventh lens 170 is 1 or greater than 1, it has a circular shape, and it may be difficult to obtain an effect of reducing the height of the seventh lens 170. In addition, the non-circularity of the thirteenth surface S13 of the seventh lens 170 may be greater than that of the fourteenth surface S14.

The non-circularity of the seventh lens 170 may be different from that of the sixth lens 160 . In detail, the non-circularity of the sixth lens 160 may be greater than that of the seventh lens 170 . For example, the non-circularity of the sixth lens 160 may be about 1.1 times greater than the non-circularity of the seventh lens 170 .

The sixth and seventh lenses 160 and 170 included in the third lens group G3 may have similar minimum effective aperture sizes CH to each other. In detail, the minimum effective aperture sizes (CH) of the sixth and seventh lenses 160 and 170 may have sizes corresponding to each other within a range of about 5% or less, and the difference between the minimum effective aperture sizes (CH) is about 0.03 mm. may be below.

The minimum effective aperture size CH of the sixth and seventh lenses 160 and 170 included in the third lens group G3 is the first to third lenses included in the first lens group G1 ( 110, 120, 130) may be smaller than the minimum effective aperture size (CH). For example, the minimum effective aperture size CH of the lenses 160 and 170 included in the third lens group G3 is the minimum effective aperture size CH of the lenses 110, 120 and 130 included in the first lens group G1. It may be about 85% or less of the effective diameter size (CH). In detail, the minimum effective diameter CH of the third lens group G3 may be about 70% to about 80% of the minimum effective diameter size of the first lens group G1.

In addition, the minimum effective diameter CH of the sixth and seventh lenses 160 and 170 included in the third lens group G3 is the fourth and fifth lenses included in the second lens group G2. It may be similar to the minimum effective aperture size (CH) of the lenses 140 and 150. For example, the minimum effective diameter CH of the lenses 160 and 170 included in the third lens group G3 is the minimum effective diameter size CH of the lenses 140 and 150 included in the second lens group G2. (CH) and may have sizes corresponding to each other within a range of about 5% or less, and a difference in size (CH) of the minimum effective diameter may be about 0.03 mm or less.

When the minimum effective diameter CH of the third lens group G3 does not satisfy the aforementioned range, the third lens group ( It may be difficult to structurally secure a space for G3) to be placed. In addition, it may be difficult to secure a moving distance between the third lens group G3 and the first lens group G1 and the fourth lens group G4 according to the operation mode.

The eighth lens 180 included in the fourth lens group G4 may have a non-circular shape. At least one lens surface of the thirteenth surface S13 and the fourteenth surface S14 of the eighth lens 180 may have a non-circular shape. In detail, each effective area of the thirteenth surface S13 and the fourteenth surface S14 may have a non-circular shape.

The eighth lens 180 may have a non-circularity (CH/CA) smaller than 1. Here, the non-circularity of the eighth lens 180 is the size of the effective mirror CA among the object side surface (fifteenth surface S15) and the sensor side surface (sixteenth surface S16) of the eighth lens 180. It may mean the ratio (CH/CA) of the minimum effective aperture size (CH) and the maximum effective aperture size (CA) of a large lens surface.

In the eighth lens 180 according to the embodiment, the sixteenth surface S16 may have a larger effective diameter than the fifteenth surface S15. The non-circularity of the eighth lens 180 may be greater than 0.6 and less than 1. If the non-circularity of the eighth lens 180 is less than 0.6, the height of the eighth lens 180 may be reduced to have a slim structure, but the area of the effective area lost due to the non-circular shape increases, Performance may deteriorate. In addition, when the non-circularity of the eighth lens 180 is 1 or greater than 1, it has a circular shape, and it may be difficult to derive an effect of reducing the height of the eighth lens 180. In addition, the non-circularity of the fifteenth surface S15 of the eighth lens 180 may be greater than that of the sixteenth surface S16.

The minimum effective aperture size (CH) of the eighth lens 180 included in the fourth lens group G4 is the first to third lenses 110, 120, and 130 included in the first lens group G1. ) can be similar to the minimum effective diameter size (CH) of For example, the minimum effective diameter CH of the lens 180 included in the fourth lens group G4 is the minimum effective diameter size CH of the lenses 110, 120, and 130 included in the first lens group G1. (CH) and may have sizes corresponding to each other within a range of about 5% or less, and a difference in size (CH) of the minimum effective diameter may be about 0.03 mm or less.

In addition, the minimum effective aperture size (CH) of the eighth lens 180 included in the fourth lens group G4 is the lens 140, 150, 160, 170) may be greater than the minimum effective aperture size (CH). For example, the minimum effective diameter CH of the eighth lens 180 of the fourth lens group G4 is the lens 140 included in the second lens group G2 and the third lens group G3. , 150, 160, 170) may be about 85% or less of the minimum effective diameter size (CH). In detail, the minimum effective diameter CH of the third lens group G3 may be about 70% to about 80% of the minimum effective diameter size of the first lens group G1.

In the first and fourth lens groups G1 and G4 disposed at fixed positions even when the operation mode is changed, the non-circularity (CH/CA) of the first lens 110 is ) may be the smallest among the lenses included in . Also, the non-circularity (CH/CA) of the third lens 130 may be the largest among the lenses included in the lens groups G1 and G4. And, in the second and third lens groups G2 and G3 whose positions change according to the operation mode, the non-circularity (CH/CA) of the seventh lens 170 is the same for the lens groups G2 and G3. It may be the smallest of the included lenses. Also, the non-circularity (CH/CA) of the fifth lens 150 may be the largest among the lenses included in the lens groups G2 and G3.

Accordingly, the optical system 1000 may have an improved assembly property and a mechanically stable form. In addition, the optical system 1000 can significantly reduce the moving distance of the moving lens group and provide various magnifications.

A camera module (not shown) according to an embodiment may include the above-described optical system 1000 . The camera module may move at least one lens group among the plurality of lens groups G1 , G2 , G3 , and G4 included in the optical system 1000 in the direction of the optical axis OA. The camera module may include a driving member (not shown) connected to the optical system 1000 .

The driving member may move at least one lens group in the direction of the optical axis OA according to the operation mode. The operating mode may include a first mode operating at a first magnification and a second mode operating at a second magnification different from the first magnification. In this case, the second magnification may be greater than the first magnification. Also, the operating mode may include a third mode operating at a third magnification that is between the first and second magnifications.

Here, the first magnification may be the lowest magnification of the optical system 1000, and the second magnification may be the highest magnification of the optical system 1000. The first magnification may be about 3 to about 5 magnification, the second magnification may be about 8 to about 11 magnification, and the third magnification may be about 5 to about 8 magnification between the two magnifications. there is.

The driving member may move at least one lens group according to one operation mode selected from among the first to third modes. In detail, the driving member is connected to the second lens group G2 and the third lens group G3, and moves the second lens group G2 and the third lens group G3 according to the operation mode. can make it

For example, in the first mode, the second lens group G2 and the third lens group G3 may be positioned at a location defined as a first position. Also, in the second mode, the second lens group G2 and the third lens group G3 may be positioned at positions defined as second positions different from the first position. In addition, in the third mode, the second lens group G2 and the third lens group G3 may be located at positions defined as third positions different from the first and second positions. The third position may be an area between the first and second positions. For example, the third position where the second lens group G2 is located in the third mode is the first and second positions where the second lens group G2 is located in the first and second modes. It may be an area in between. Also, the third position where the third lens group G3 is located in the third mode is an area between the first and second positions where the third lens group G3 is located in the first and second modes. can be

That is, in the optical system 1000 according to the embodiment, the second lens group G2 and the third lens group G3 can move according to the operation mode, and the first lens group G1 and the fourth lens group G1 can move. Group G4 may be disposed at a fixed location. At each of the first position, the second position, and the third position according to the operation mode, the first to fourth lens groups G1 , G2 , G3 , and G4 may have set intervals from adjacent lens groups.

Accordingly, the optical system 1000 can have a constant total track length (TTL) even when the operation mode changes, and the effective focal length and magnification of the optical system 1000 can be controlled by controlling the positions of some lens groups. there is.

The optical system 1000 according to the embodiment may satisfy at least one of equations described below. Accordingly, the optical system 1000 according to the embodiment can effectively correct the aberration that changes according to the operation mode change. In addition, the optical system 1000 according to the embodiment can effectively provide an autofocus (AF) function for a subject at various magnifications and can be provided in a slim and compact structure.

[Equation 1]

n_G1, n_G2, n_G3 > 1 (n_G1, n_G2, n_G3 are natural numbers)

In Equation 1, n_G1, n_G2, and n_G3 denote the number of lenses included in each of the first to third lens groups G1, G2, and G3.

[Equation 2]

0.6 < CH_G1max / CA_G1max < 1

In Equation 2, CA_G1max means the maximum effective diameter size (CA) of the lens surface of the lens having the largest effective diameter among the lenses included in the first lens group G1, and CH_G1max is the size of the lens surface of the lens having the largest effective diameter. It means the minimum effective aperture size (CH).

[Equation 3]

0.7 < CH_G2max / CA_G2max < 1

In Equation 3, CA_G2max means the maximum effective diameter size (CA) of the lens surface of the lens having the largest effective diameter among the lenses included in the second lens group G2, and CH_G2max is the size of the lens surface of the lens having the largest effective diameter. It means the minimum effective aperture size (CH).

[Equation 4]

0.7 < CH_G3max / CA_G3max < 1

In Equation 4, CA_G3max means the maximum effective diameter size (CA) of the lens surface of the lens having the largest effective diameter among the lenses included in the third lens group (G3), and CH_G3max is the size of the lens surface of the lens having the largest effective diameter. It means the minimum effective aperture size (CH).

[Equation 5]

0.6 < CH_G4max / CA_G4max < 1

In Equation 5, CA_G4max means the maximum effective diameter size (CA) of the lens surface of the lens having the largest effective diameter among the lenses included in the fourth lens group G4, and CH_G4max is the size of the lens surface of the lens having the largest effective diameter. It means the minimum effective aperture size (CH).

[Equation 6]

1 < CH_G1max / CH_G2max < 2

In Equation 6, CH_G1max means the minimum effective diameter size (CH) of the lens surface of the lens having the largest effective diameter among the lenses included in the first lens group G1, and CH_G2max is included in the second lens group G2. It means the size of the minimum effective diameter (CH) of the lens surface of the lens with the largest effective diameter among the lenses.

[Equation 7]

1 < CH_G4max / CH_G3max < 2

In Equation 7, CH_G3max means the minimum effective diameter size (CH) of the lens surface of the lens having the largest effective diameter among the lenses included in the third lens group G3, and CH_G4max is included in the fourth lens group G4. It means the size of the minimum effective diameter (CH) of the lens surface of the lens with the largest effective diameter among the lenses.

[Equation 8]

0.9 < CH_G1max / CH_G4max < 1.1

In Equation 8, CH_G1max means the minimum effective diameter size (CH) of the lens surface of the lens having the largest effective diameter among the lenses included in the first lens group G1, and CH_G4max is included in the fourth lens group G4. It means the size of the minimum effective diameter (CH) of the lens surface of the lens with the largest effective diameter among the lenses.

[Equation 9]

0.9 < CH_G2max / CH_G3max < 1.1

In Equation 9, CH_G2max means the minimum effective diameter size (CH) of the lens surface of the lens having the largest effective diameter among the lenses included in the second lens group G2, and CH_G3max is included in the third lens group G3. It means the size of the minimum effective diameter (CH) of the lens surface of the lens with the largest effective diameter among the lenses.

[Equation 10]

CH_G1max / CH_G2max < CA_G1max / CA_G2max

CH_G4max / CH_G3max < CA_G4max / CA_G3max

CH_G1max / CH_G4max < CA_G1max / CA_G4max

In Equation 10, CH_Gnmax means the size of the minimum effective diameter (CH) of the lens surface of a lens having the largest effective diameter among the lenses included in the nth lens group, and CA_Gnmax is the size of the largest effective diameter among the lenses included in the nth lens group. It means the maximum effective aperture size (CA) of the lens surface of a large lens.

[Equation 11]

0.6 < CH_LnSm / CA_LnSm < 1

(n=1~8, m=1 or 2, except for L3S2)

In Equation 11, CH_LnSm means the size of the minimum effective diameter (CH) of the object-side surface (m = 1) or the sensor-side surface (m = 2) of the n-th lens, CA_LnSm is the object-side surface of the n-th lens ( m = 1) or the size of the maximum effective diameter (CA) on the side of the sensor (m = 2).

However, in Equation 11, when n = 3 and m = 2 (L3S2), the sensor-side surface (the sixth surface S6) of the third lens 130 is excluded.

[Equation 12]

CH_L1S1 / CA_L1S1 < CH_LnSm / CA_LnSm

(1 < n, m= 1 or 2, except for L3S2)

In Equation 12, CH_L1S1 means the size of the minimum effective diameter CH of the object-side surface (first surface S1) of the first lens 110, and CA_L1S1 is the object-side surface of the first lens 110. It means the size of the maximum effective diameter CA of (the first surface S1).

Also, CH_LnSm means the size of the minimum effective diameter (CH) of the object-side surface (m=1) or sensor-side surface (m=2) of the n-th lens, and CA_LnSm is the object-side surface (m=2) of the n-th lens. 1) or the size of the maximum effective diameter (CA) on the side of the sensor (m = 2).

However, in Equation 12, when n = 3 and m = 2 (L3S2), the sensor-side surface (sixth surface S6) of the third lens 130 is excluded.

[Equation 13]

CH_L3S2 / CA_L3S2 = 1

In Equation 13, CH_L3S2 means the size of the minimum effective diameter CH of the sensor-side surface (sixth surface S6) of the third lens 130, and CA_L3S2 is the sensor-side surface of the third lens 130. It means the size of the maximum effective diameter CA of (the sixth surface S6).

When the optical system 1000 according to the embodiment satisfies at least one of Equations 1 to 13, the optical system 1000 may have a slim structure. In detail, the optical system 1000 can be provided slim by reducing the height while minimizing the area of the effective area lost due to the non-circular shape. In addition, the optical system 1000 can prevent optical performance from deteriorating due to a reduction in the area of an effective region, and can control vignetting and aberration characteristics. In addition, the optical system 1000 may have improved assemblability and a mechanically stable form.

[Equation 14]

1 < L_G1 / L_G2 < 3

In Equation 14, among the lenses included in the first lens group G1, the distance between the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 on the optical axis OA. means For example, L_G1 means the distance between the first surface S1 of the first lens 110 and the sixth surface S6 of the third lens 130 in the optical axis OA.

In addition, L_G2 is the distance between the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 among the lenses included in the second lens group G2, on the optical axis OA. means For example, L_G2 means the distance between the seventh surface S7 of the fourth lens 140 and the optical axis OA of the tenth surface S10 of the fifth lens 150 .

[Equation 15]

1 < L_G1 / L_G3 < 3

In Equation 15, L_G1 is the optical axis OA of the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 among the lenses included in the first lens group G1. means the distance of For example, L_G1 means the distance between the first surface S1 of the first lens 110 and the sixth surface S6 of the third lens 130 in the optical axis OA.

In addition, L_G3 is the distance between the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 among the lenses included in the third lens group G3, on the optical axis OA. means For example, L_G3 means the distance between the 11th surface S11 of the sixth lens 160 and the 14th surface S14 of the seventh lens 170 in the optical axis OA.

When the optical system 1000 according to the embodiment satisfies at least one of Equations 14 and 15, it has a relatively small TTL and can provide various magnifications according to mode changes.

[Equation 16]

0.05 < L_G1 / TTL < 0.5

In Equation 16, L_G1 is the optical axis OA of the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 among the lenses included in the first lens group G1. means the distance of For example, L_G1 means the distance between the first surface S1 of the first lens 110 and the sixth surface S6 of the third lens 130 in the optical axis OA.

In addition, TTL (Total track length) is the distance (mm) in the optical axis (OA) from the object-side surface (first surface (S1)) of the first lens 110 to the top surface of the image sensor 300. it means.

When the optical system 1000 according to the embodiment satisfies Equation 16, the optical system 1000 has a relatively small TTL and controls stray light incident on the first lens group G1 to improve optical quality. may have characteristics.

[Equation 17]

20 < |vd4 - vd5|

In Equation 17, vd4 means the Abbe's number of the fourth lens 140, and vd5 means the Abbe's number of the fifth lens 150.

When the optical system 1000 according to the embodiment satisfies Equation 17, the optical system 1000 may improve chromatic aberration characteristics.

[Equation 18]

20 < |vd6 - vd7|

In Equation 18, vd6 means the Abbe number of the sixth lens, and vd7 means the Abbe number of the seventh lens.

When the optical system 1000 according to the embodiment satisfies Equation 18, the optical system 1000 may improve chromatic aberration characteristics.

[Equation 19]

1 < L1R1 / L3R2 < 2

In Equation 19, L1R1 means the radius of curvature of the object side surface (first surface S1) of the first lens 110, and L3R2 is the sensor side surface of the third lens 130 (the sixth surface ( It means the radius of curvature of S6)).

When the optical system 1000 according to the embodiment satisfies Equation 19, the optical system 1000 can control stray light incident on the first lens group G1.

[Equation 20]

1 < L1R1 / L4R1 < 2

In Equation 20, L1R1 means the radius of curvature of the object-side surface (first surface S1) of the first lens 110, and L4R1 is the object-side surface of the fourth lens 140 (the seventh surface ( It means the radius of curvature of S7)).

When the optical system 1000 according to the embodiment satisfies Equation 20, the optical system 1000 may have good optical performance at various magnifications.

[Equation 21]

1.1 < CA_L1S1 / CA_L3S2 < 1.7

In Equation 21, CA_L1S1 means the clear aperture (CA) of the object side surface (first surface S1) of the first lens 110, and CA_L3S2 is the sensor side of the third lens 130. It means the effective diameter size CA of the surface (the sixth surface S6).

When the optical system 1000 according to the embodiment satisfies Equation 21, the optical system 1000 can control the light incident on the first lens group G1 and thus can have improved optical characteristics.

[Equation 22]

1.1 < CA_L1S1 / CA_L4S1 < 1.7

In Equation 22, CA_L1S1 means the clear aperture (CA) of the object-side surface (first surface S1) of the first lens 110, and CA_L4S1 is the object-side surface of the fourth lens 140. It means the effective diameter size CA of the surface (the seventh surface S7).

When the optical system 1000 according to the embodiment satisfies Equation 22, the optical system 1000 may improve improved optical performance at various magnifications.

[Equation 23]

0.05 < m_G2 / TTL < 0.35

In Equation 23, m_G2 is the second lens group (when changing from the first mode operating at a first magnification to the second mode operating at a second magnification, or from the second mode to the first mode) It means the moving distance of G2). In detail, m_G2 is the distance along the optical axis OA between the first and second lens groups G1 and G2 in the first mode and the first and second lens groups G1 in the second mode. , G2) means a value for a difference in intervals in the optical axis OA.

In addition, TTL (Total track length) is the distance (mm) in the optical axis (OA) from the object-side surface (first surface (S1)) of the first lens 110 to the top surface of the image sensor 300. it means.

When the optical system 1000 according to the embodiment satisfies Equation 23, the optical system 1000 can minimize the moving distance of the second lens group G2 when the magnification is changed, so the optical system 1000 has a slim structure. can have In addition, when the position of the second lens group G2 is controlled, a moving distance can be minimized, thereby improving power consumption characteristics.

[Equation 24]

0.05 < m_G3 / TTL < 0.35

In Equation 24, m_G3 is the third lens group (when changing from the first mode operating at a first magnification to the second mode operating at a second magnification, or from the second mode to the first mode) It means the moving distance of G3). In detail, m_G3 is the distance along the optical axis OA between the third and fourth lens groups G3 and G4 in the first mode and the third and fourth lens groups G3 in the second mode. , G4) means a value for the difference in intervals in the optical axis OA.

In addition, TTL (Total track length) is the distance (mm) in the optical axis (OA) from the object-side surface (first surface (S1)) of the first lens 110 to the top surface of the image sensor 300. it means.

When the optical system 1000 according to the embodiment satisfies Equation 24, the optical system 1000 can minimize the moving distance of the third lens group G3 when the magnification is changed, so the optical system 1000 has a slim structure. can have In addition, when the position of the third lens group G3 is controlled, a moving distance can be minimized, thereby improving power consumption characteristics.

[Equation 25]

1.5 < m_G2 / L_G2 < 2.5

In Equation 25, m_G2 is the second lens group (when changing from the first mode operating at a first magnification to the second mode operating at a second magnification, or from the second mode to the first mode) It means the moving distance of G2). In detail, m_G2 is the distance along the optical axis OA between the first and second lens groups G1 and G2 in the first mode and the first and second lens groups G1 in the second mode. , G2) means a value for a difference in intervals in the optical axis OA.

In addition, L_G2 is the distance between the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 among the lenses included in the second lens group G2, on the optical axis OA. means For example, L_G2 means the distance between the seventh surface S7 of the fourth lens 140 and the optical axis OA of the tenth surface S10 of the fifth lens 150 .

When the optical system 1000 according to the embodiment satisfies Equation 25, the optical system 1000 can minimize the moving distance of the second lens group G2 when the magnification is changed, so the optical system 1000 has a slim structure. can have In addition, when the position of the second lens group G2 is controlled, a moving distance can be minimized, thereby improving power consumption characteristics.

[Equation 26]

2 < m_G3 / L_G3 < 3.5

In Equation 26, m_G3 is the third lens group (when changing from the first mode operating at a first magnification to the second mode operating at a second magnification, or from the second mode to the first mode) It means the moving distance of G3). In detail, m_G3 is the distance along the optical axis OA between the third and fourth lens groups G3 and G4 in the first mode and the third and fourth lens groups G3 in the second mode. , G4) means a value for the difference in intervals in the optical axis OA.

In addition, L_G3 is the distance between the object-side surface of the lens closest to the object and the sensor-side surface of the lens closest to the image sensor 300 among the lenses included in the third lens group G3, on the optical axis OA. means For example, L_G3 means the distance between the 11th surface S11 of the sixth lens 160 and the 14th surface S14 of the seventh lens 170 in the optical axis OA.

When the optical system 1000 according to the embodiment satisfies Equation 26, the optical system 1000 can minimize the moving distance of the third lens group G3 when the magnification is changed, so the optical system 1000 has a slim structure. can have In addition, when the position of the third lens group G3 is controlled, a moving distance can be minimized, thereby improving power consumption characteristics.

[Equation 27]

4 < d_G12_mode1 / d_G34_mode1 < 12

In Equation 27, d_G12_mode1 represents the first lens group G1 and the second lens group G2 in the first mode in which the second lens group G2 and the third lens group G3 are disposed at the first positions. ) means the interval between That is, d_G12_mode1 means the distance between the third lens 130 and the fourth lens 140 in the optical axis OA in the first mode.

In addition, d_G34_mode1 is the interval between the third lens group G3 and the fourth lens group G4 in the first mode in which the second lens group G2 and the third lens group G3 are disposed in the first position. means the interval of That is, d_G34_mode1 means the distance between the seventh lens 170 and the eighth lens 180 in the optical axis OA in the first mode.

When the optical system 1000 according to the embodiment satisfies Equation 27, the optical system 1000 may have improved optical characteristics at the first magnification. In detail, the optical system 1000 may have improved aberration characteristics at the first magnification, and may improve optical performance of the center and periphery of the FOV.

[Equation 28]

0.01 < d_G12_mode2 / d_G34_mode2 < 0.5

In Equation 28, d_G12_mode2 represents the first lens group G1 and the second lens group G2 in the second mode in which the second lens group G2 and the third lens group G3 are disposed at the second position. ) means the interval between That is, d_G12_mode2 means the distance between the third lens 130 and the fourth lens 140 in the optical axis OA in the second mode.

In addition, d_G34_mode2 is the interval between the third lens group G3 and the fourth lens group G4 in the second mode in which the second lens group G2 and the third lens group G3 are disposed at the second position. means the interval of That is, d_G34_mode2 means the distance between the seventh lens 170 and the eighth lens 180 in the optical axis OA in the second mode.

When the optical system 1000 according to the embodiment satisfies Equation 28, the optical system 1000 may have improved optical characteristics at the second magnification. In detail, the optical system 1000 may have improved aberration characteristics at the second magnification and improve optical performance of the periphery of the field of view (FOV).

[Equation 29]

0.1 < EFL_1 / EFL_2 < 1

In Equation 29, EFL_1 is a first effective focal length, and in the first mode operation in which the second lens group G2 and the third lens group G3 are located at the first position, the optical system 1000 is the effective focal length (EFL).

In addition, EFL_2 is a second effective focal length, and the effective focal length of the optical system 1000 during the second mode operation in which the second lens group G2 and the third lens group G3 are located at the second position is the distance (EFL).

[Equation 30]

2 < EFL_1 / EPD_1 < 3

In Equation 30, EFL_1 is a first effective focal length, and in the first mode operation in which the second lens group G2 and the third lens group G3 are located at the first position, the optical system 1000 is the effective focal length (EFL).

In addition, EPD_1 is the entrance pupil diameter (EPD) of the optical system 1000 during the first mode operation in which the second lens group G2 and the third lens group G3 are located at the first positions. means

When the optical system 1000 according to the embodiment satisfies Equation 30, the optical system 1000 can secure a bright image during the first mode operation.

[Equation 31]

4.5 < EFL_2 / EPD_2 < 6

In Equation 31, EFL_2 is a second effective focal length, and when the second mode operation in which the second lens group G2 and the third lens group G3 are located at the second position, the optical system 1000 is the effective focal length (EFL).

In addition, EPD_2 is the entrance pupil diameter (EPD) of the optical system 1000 during the second mode operation in which the second lens group G2 and the third lens group G3 are located at the second position. means

When the optical system 1000 according to the embodiment satisfies Equation 31, the optical system 1000 can secure a bright image during the second mode operation.

[Equation 32]

F#_Mode1 < 3.5

F#_Mode2 < 6.0

In Equation 32, F#_mode1 means the F-number of the optical system 1000 during the first mode operation in which the second lens group G2 and the third lens group G3 are located at the first positions, and , F#_mode2 denotes the F-number of the optical system 1000 during the second mode operation in which the second lens group G2 and the third lens group G3 are located at the second position.

[Equation 33]

1 < TTL / EFL_1 < 3

In Equation 33, Total track length (TTL) is the distance (mm) on the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the top surface of the image sensor 300. ) means

In addition, EFL_1 is a first effective focal length, and the effective focal length of the optical system 1000 when the second lens group G2 and the third lens group G3 are located in the first mode is operated in the first mode. is the distance (EFL).

When the optical system 1000 according to the embodiment satisfies Equation 33, the optical system 1000 has a focal length set in the first mode operation and can be provided slim and compact.

[Equation 34]

0.1 < TTL / EFL_2 < 1

In Equation 34, Total track length (TTL) is the distance (mm) on the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the top surface of the image sensor 300. ) means

In addition, EFL_2 is a second effective focal length, and the effective focal length of the optical system 1000 during the second mode operation in which the second lens group G2 and the third lens group G3 are located at the second position is the distance (EFL).

When the optical system 1000 according to the embodiment satisfies Equation 34, the optical system 1000 has a focal length set in the second mode operation and can be provided slim and compact.

[Equation 35]

1 < CA_Smax / ImgH < 4

In Equation 35, CA_Smax means the size of the largest effective mirror CA among lens surfaces of the plurality of lenses 100 included in the optical system 1000.

In addition, ImgH is the distance from the 0 field area at the center of the top surface of the image sensor 300 overlapping the optical axis OA to the 1.0 field area of the image sensor 300, and the distance is the optical axis OA. ) is the distance in the vertical direction of That is, the ImgH means 1/2 of the total diagonal length of the effective area of the image sensor 300 .

When the optical system 1000 according to the embodiment satisfies Equation 35, the optical system 1000 can be provided slim and compact. In addition, the optical system 1000 can realize high resolution and high image quality.

[Equation 36]

5 < TTL / ImgH < 10

In Equation 36, Total track length (TTL) is the distance (mm) on the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the top surface of the image sensor 300. ) means

In addition, ImgH is the distance from the 0 field area at the center of the top surface of the image sensor 300 overlapping the optical axis OA to the 1.0 field area of the image sensor 300, and the distance is the optical axis OA. ) is the distance in the vertical direction of That is, the ImgH means 1/2 of the total diagonal length of the effective area of the image sensor 300 .

When the optical system 1000 according to the embodiment satisfies Equation 36, the optical system 1000 may have a smaller TTL, and thus the optical system 1000 may be provided slim and compact.

[Equation 37]

15 < TTL / BFL < 30

In Equation 37, Total track length (TTL) is the distance (mm) on the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the top surface of the image sensor 300. ) means

Also, a back focal length (BFL) refers to a distance along an optical axis OA from a vertex of a sensor-side surface of a lens closest to the image sensor 300 to an upper surface of the image sensor 300 .

[Equation 38]

2 < ImgH / BFL < 4

In Equation 38, ImgH is the distance from the 0 field area at the center of the top surface of the image sensor 300 overlapping the optical axis OA to the 1.0 field area of the image sensor 300, the distance being the optical axis. (OA) is the distance in the vertical direction. That is, the ImgH means 1/2 of the total diagonal length of the effective area of the image sensor 300 .

Also, a back focal length (BFL) refers to a distance along an optical axis OA from a vertex of a sensor-side surface of a lens closest to the image sensor 300 to an upper surface of the image sensor 300 .

When the optical system 1000 according to the embodiment satisfies Equation 38, it is possible to secure a BFL required for a relatively large image sensor 300, for example, a large image sensor 300 around 1 inch. there is. In addition, when the optical system 1000 satisfies Equation 38, the optical system 1000 can operate at various magnifications while maintaining TTL, and can have excellent optical characteristics in the center and periphery of the FOV.

[Equation 39]

In Equation 39, Z is Sag and may mean a distance in the optical axis direction from an arbitrary position on the aspherical surface to the apex of the aspherical surface.

Also, Y may mean a distance in a direction perpendicular to the optical axis from an arbitrary position on the aspherical surface to the optical axis.

Also, c may mean the curvature of the lens, and K may mean the conic constant.

Also, A, B, C, D, ?? may mean an aspheric constant.

The optical system 1000 according to the embodiment may satisfy at least one of Equations 1 to 38 described above. Accordingly, the optical system 1000 and the camera module may have improved optical characteristics.

In detail, as the optical system 1000 satisfies at least one of Equations 1 to 38, optical characteristics such as chromatic aberration, vignetting, and deterioration in peripheral image quality caused by movement of the lens group are deteriorated. can be effectively corrected. In addition, the optical system 1000 according to the embodiment can significantly reduce the moving distance of the lens group and provide an autofocus (AF) function for various magnifications with excellent power consumption characteristics.

In addition, as the optical system 1000 according to the embodiment satisfies at least one of Equations 1 to 38, it has improved assemblability, can have a mechanically stable form, and is provided in a slim structure, so that the optical system ( 1000) and a camera module including the same may have a compact structure.

Hereinafter, the optical system 1000 according to the embodiment and first to third mode changes will be described in more detail.

In the optical system 1000 according to the embodiment, the first lens group G1 and the fourth lens group G4 may be fixed, and the second lens group G2 and the third lens group G3 may be moved. can possibly be provided.

The first lens group G1 may include three lenses, for example, the first to third lenses 110, 120, and 130, and the second lens group G2 may include two lenses, for example For example, the fourth and fifth lenses 140 and 150 may be included. In addition, the third lens group G3 may include two lenses, for example, the sixth and seventh lenses 160 and 170, and the fourth lens group G4 may include one lens, eg, the sixth and seventh lenses 160 and 170. For example, the eighth lens 180 may be included.

In addition, in the optical system 1000 according to the embodiment, the object-side surface (seventh surface S7) of the fourth lens 140 may serve as a diaphragm, and the fourth lens group G4 and the image The filter 500 described above may be disposed between the sensors 300 .

lens noodle Bending radius (mm) Thickness or Spacing (mm) refractive index Abe number Focal length (mm) 1st lens page 1 6.080 1.194 1.671 19.24 16.684 side 2 12.069 0.100 2nd lens 3rd side 8.378 1.156 1.535 55.71 15.143 page 4 -265.073 1.093 3rd lens page 5 -11.575 0.600 1.640 23.53 -4.301 page 6 3.731 d_G12 4th lens page 7 3.660 1.615 1.535 55.71 5.219 page 8 -10.132 0.345 5th lens page 9 34.645 0.600 1.671 19.24 -12.023 page 10 6.565 d_G23 6th lens page 11 -7.982 1.117 1.671 19.24 7.905 page 12 -3.393 0.376 7th lens page 13 -3.831 0.611 1.535 55.71 -3.972 page 14 5.083 d_G34 8th lens page 15 18.414 1.598 1.671 19.24 8.843 page 16 -8.607 0.500 filter page 17 infinity 0.210 page 18 infinity 0.276 image sensor infinity 0.014

lens noodle Maximum Effective Diameter Size (CA) (mm) Minimum effective diameter size (CH) (mm) 1st lens page 1 6.600 4.653 side 2 6.328 4.653 2nd lens 3rd side 6.187 4.652 page 4 5.837 4.653 3rd lens page 5 4.998 4.648 page 6 4.510 4.510 4th lens page 7 4.600 3.551 page 8 4.528 3.551 5th lens page 9 4.206 3.550 page 10 3.885 3.550 6th lens page 11 4.461 3.551 page 12 4.426 3.551 7th lens page 13 4.353 3.548 page 14 4.914 3.548 8th lens page 15 6.239 4.647 page 16 6.500 4.647

Mode 1 (Mode 1) d_G12 (mm) 5.548 d_G23 (mm) 5.103 d_G34 (mm) 0.743 EFL_1 (mm) 15.2 EPD_1 5.25 Magnification (1st magnification) 4.4 times F-number 3.08 FOV (degrees) 21.11 TTL_1 (mm) 22.786 BFL_1 (mm) 0.986 ImgH (mm) 2.823

Tables 1 to 3 relate to lens data when the optical system 1000 according to the embodiment and the camera module including the optical system operate in the first mode.

In detail, Tables 1 and 2 show the radius of curvature of the first to eighth lenses 110, 120, 130, 140, 150, 160, 170, and 180 in the optical axis OA, the center of the lens It is about thickness, center distance between lenses, refractive index, Abbe's number, and maximum/minimum effective diameter size (CA, CH).

In addition, Table 3 shows the effective focal length (EFL_1) and entrance pupil size (EPD_1) for the first mode having the first magnification, and the distance between the first lens group G1 and the second lens group G2. (d_G12), the distance between the second lens group G2 and the third lens group G3 (d_G23), the distance between the third lens group G3 and the fourth lens group G4 (d_G34) ) is about.

Referring to Table 1, the first lens 110 in the optical axis OA of the optical system 1000 according to the embodiment may have positive (+) refractive power. In the optical axis OA, the first surface S1 of the first lens 110 may have a convex shape, and the second surface S2 may have a concave shape. The first lens 110 may have a meniscus shape convex from the optical axis OA toward the object side. The first surface S1 may be an aspheric surface, and the second surface S2 may be an aspherical surface.

The second lens 120 may have positive (+) refractive power along the optical axis OA. In the optical axis OA, the third surface S3 of the second lens 120 may have a convex shape, and the fourth surface S4 may have a convex shape. The second lens 120 may have a convex shape on both sides of the optical axis OA. The third surface S3 may be an aspherical surface, and the fourth surface S4 may be an aspheric surface.

The third lens 130 may have refractive power opposite to that of the first lens 110 in the optical axis OA. In detail, the third lens 130 may have negative (-) refractive power on the optical axis OA. In the optical axis OA, the fifth surface S5 of the third lens 130 may have a concave shape, and the sixth surface S6 may have a concave shape. The third lens 130 may have a concave shape on both sides of the optical axis. The fifth surface S5 may be an aspheric surface, and the sixth surface S6 may be an aspheric surface.

The fourth lens 140 may have positive (+) refractive power along the optical axis OA. In the optical axis OA, the seventh surface S7 of the fourth lens 140 may have a convex shape, and the eighth surface S8 may have a convex shape. The fourth lens 140 may have a convex shape on both sides. The seventh surface S7 may be an aspheric surface, and the eighth surface S8 may be an aspherical surface.

The fifth lens 150 may have refractive power opposite to that of the fourth lens 140 in the optical axis OA. In detail, the fifth lens 150 may have negative (-) refractive power on the optical axis OA. In the optical axis OA, the ninth surface S9 of the fifth lens 150 may have a convex shape, and the tenth surface S10 may have a concave shape. The fifth lens 150 may have a meniscus shape convex from the optical axis OA toward the object side. The ninth surface S9 may be an aspheric surface, and the tenth surface S10 may be an aspherical surface.

The sixth lens 160 may have positive (+) refractive power along the optical axis OA. In the optical axis OA, the eleventh surface S11 of the sixth lens 160 may have a concave shape, and the twelfth surface S12 may have a convex shape. The sixth lens 160 may have a meniscus shape convex from the optical axis OA toward the sensor. The eleventh surface S11 may be an aspheric surface, and the twelfth surface S12 may be an aspherical surface.

The seventh lens 170 may have refractive power opposite to that of the sixth lens 160 in the optical axis OA. In detail, the seventh lens 170 may have negative (-) refractive power on the optical axis OA. In the optical axis OA, the thirteenth surface S13 of the seventh lens 170 may have a concave shape, and the fourteenth surface S14 may have a concave shape. The seventh lens 170 may have a concave shape on both sides of the optical axis OA. The thirteenth surface S13 may be an aspheric surface, and the fourteenth surface S14 may be an aspheric surface.

The eighth lens 180 may have positive (+) refractive power along the optical axis OA. In the optical axis OA, the fifteenth surface S15 of the eighth lens 180 may have a convex shape, and the sixteenth surface S16 may have a convex shape. The eighth lens 180 may have a convex shape on both sides of the optical axis OA. The fifteenth surface S15 may be an aspheric surface, and the sixteenth surface S16 may be an aspheric surface.

In addition, in the optical system 1000 according to the embodiment, the value of the aspherical surface coefficient of each lens surface is shown in Table 4 below.

1st lens 2nd lens 3rd lens 4th lens page 1 side 2 3rd side page 4 page 5 page 6 page 7 page 8 Y Radius 6.080 12.069 8.378 -265.073 -11.575 3.731 3.660 -10.132 K -0.348 -7.836 -4.304 -99.000 -2.265 -1.237 -0.452 -11.226 A 2.83E-04 -2.56E-04 -7.13E-04 5.96E-05 4.86E-04 4.59E-04 2.10E-04 -5.01E-04 B -8.72E-05 6.24E-04 1.23E-03 3.41E-04 -1.08E-03 -1.04E-03 5.80E-04 4.55E-04 C 4.54E-05 -4.65E-04 -8.52E-04 -3.70E-04 5.68E-04 6.90E-04 -5.70E-04 -1.57E-04 D -1.51E-05 1.86E-04 3.24E-04 1.75E-04 -1.45E-04 -2.07E-04 3.58E-04 -6.27E-05 E 3.44E-06 -4.25E-05 -7.10E-05 -4.58E-05 1.09E-05 1.30E-05 -1.44E-04 7.13E-05 F -5.23E-07 5.70E-06 9.12E-06 6.99E-06 3.07E-06 9.75E-06 3.70E-05 -2.64E-05 G 4.88E-08 -4.39E-07 -6.63E-07 -6.17E-07 -8.51E-07 -3.04E-06 -5.91E-06 5.01E-06 H -2.50E-09 1.78E-08 2.44E-08 2.90E-08 8.29E-08 3.71E-07 5.36E-07 -4.93E-07 J 5.32E-11 -2.87E-10 -3.22E-10 -5.54E-10 -3.00E-09 -1.72E-08 -2.14E-08 1.97E-08 5th lens 6th lens 7th lens 8th lens page 9 page 10 page 11 page 12 page 13 page 14 page 15 page 16 Y Radius 34.645 6.565 -7.982 -3.393 -3.831 5.083 18.414 -8.607 K 14.161 3.659 -22.949 -5.746 0.257 -24.157 29.018 1.744 A 1.64E-04 2.64E-03 6.61E-03 6.48E-03 -1.24E-02 -1.35E-02 -5.60E-03 -1.79E-02 B -5.82E-04 -1.91E-03 -4.06E-03 -1.23E-02 -1.72E-02 -2.01E-03 2.36E-03 9.12E-03 C 1.45E-03 4.01E-03 2.01E-03 4.55E-03 1.48E-02 7.34E-03 -1.06E-03 -3.14E-03 D -1.61E-03 -4.35E-03 8.33E-05 2.75E-03 5.80E-04 -4.03E-03 2.81E-04 7.08E-04 E 9.71E-04 2.86E-03 -5.98E-04 -3.20E-03 -5.14E-03 1.11E-03 -5.17E-05 -1.07E-04 F -3.43E-04 -1.15E-03 3.01E-04 1.29E-03 2.64E-03 -1.68E-04 6.76E-06 1.08E-05 G 7.15E-05 2.80E-04 -7.07E-05 -2.65E-04 -6.31E-04 1.26E-05 -5.98E-07 -7.20E-07 H -8.18E-06 -3.78E-05 8.26E-06 2.79E-05 7.53E-05 -2.44E-07 3.13E-08 2.83E-08 J 3.96E-07 2.17E-06 -3.84E-07 -1.19E-06 -3.62E-06 -1.32E-08 -7.14E-10 -4.96E-10

In addition, in the optical system 1000 according to the embodiment, the plurality of lenses 100 may have a non-circularity as shown in Table 5 below. Here, non-roundness is the ratio (CH/CA) of the minimum effective aperture size (Clear Height, CH) and the maximum effective aperture size (CA) of the lens surface with the largest clear aperture (CA) between the object and sensor sides of the lens. can mean

lens group lens Non-circularity (CH/CA) 1st lens group 1st lens 0.705 2nd lens 0.752 3rd lens 0.930 2nd lens group 4th lens 0.772 5th lens 0.844 3rd lens group 6th lens 0.796 7th lens 0.722 4th lens group 8th lens 0.715

Referring to Table 5, non-circularities of the plurality of lenses 100 may be different from each other.

In detail, in the first lens group G1, the first lens 110 may have the smallest non-circularity, and the third lens 130 may have the largest non-circularity. The first lens 110 may have the smallest non-circularity among the first to eighth lenses 110 , 120 , 130 , 140 , 150 , 160 , 170 , and 180 . The non-circularity of the lenses included in the first lens group G1 may have a larger non-circularity as the moving group whose position changes according to the operation mode, that is, the lenses adjacent to the second lens group G2.

In the second lens group G2, the non-circularity of the fourth lens 140 may be smaller than that of the fifth lens 150. The non-circularity of the lenses included in the second lens group G2 may have a smaller non-circularity in a fixed group having a fixed position, that is, a lens adjacent to the first lens group G1. The non-circularity of the lenses included in the group G2 may have a larger non-circularity as the moving group, that is, the lens adjacent to the third lens group G3 whose position changes according to the operation mode.

In the third lens group G3, the non-circularity of the sixth lens 160 may be greater than that of the seventh lens 170. The non-circularity of the lenses included in the third lens group G3 may have a larger non-circularity as the moving group whose position changes according to the operation mode, that is, the lenses adjacent to the second lens group G2. In addition, the non-circularity of the lenses included in the third lens group G3 may have a smaller non-circularity in a fixed group having a fixed position, that is, a lens adjacent to the fourth lens group G4.

Among the lenses included in the moving groups G2 and G3, the non-circularity of the fifth lens 150 may be the largest and the non-circularity of the seventh lens 170 may be the smallest.

The non-circularity of the eighth lens 180 in the fourth lens group G4 may be smaller than the non-circularity of the lenses included in the second lens group G2 and the third lens group G3.

Among the lenses included in the fixed groups G1 and G4, the non-circularity of the third lens 130 may be the largest and the non-circularity of the first lens 110 may be the smallest. At this time, the non-circularity of the third lens 130 may be the largest among the non-circularity of the plurality of lenses 100, and the non-circularity of the first lens 110 is the non-circularity of the plurality of lenses 100. It may be the smallest of the sentences.

That is, referring to Table 5, the non-circularities of the plurality of lenses 100 are the third lens 130, the fifth lens 150, the sixth lens 160, the fourth lens 140, the second The lens 120, the seventh lens 170, the eighth lens 180, and the first lens 110 may have large values in that order.

Also, the Abbe number vd4 of the fourth lens 140 included in the second lens group G2 may differ from the Abbe number vd5 of the fifth lens 150 by 20 or more. As the fourth lens 140 and the fifth lens 150 have the above-described difference in Abbe number, it is possible to minimize a change in chromatic aberration that occurs when the magnification changes according to the movement of the second lens group G2.

Also, the Abbe number (vd7) of the seventh lens 170 included in the third lens group G3 may differ from the Abbe number (vd6) of the sixth lens 160 by 20 or more. As the sixth lens 160 and the seventh lens 170 have the Abbe number difference, minimizing and/or compensating for a chromatic aberration change occurring when the magnification changes according to the movement of the third lens group G3 can do.

The camera module according to the embodiment may acquire information about a subject at various magnifications. In detail, the driving member may control the positions of the second lens group G2 and the third lens group G3, and through this, the camera module may operate at various magnifications.

For example, referring to FIGS. 1 to 4 and Tables 1 to 5, the camera module including the optical system 1000 may operate in the first mode having a first magnification. The first magnification may be about 3x to about 5x. In detail, in an embodiment, the first magnification may be about 4.4 magnification.

In the first mode, each of the second lens group G2 and the third lens group G3 may be located at a position defined as a first position. When the initial positions of each of the second lens group G2 and the third lens group G3 are the first positions, the two lens groups G2 and G3 may not move. Alternatively, when the initial positions of each of the second and third lens groups G2 and G3 are different from the first positions, the two lens groups G2 and G3 are driven by the driving force of the driving member. It can move to the first position.

Accordingly, each of the first to fourth lens groups G4 may be disposed at set intervals. For example, the second lens group G2 is separated from the first lens group G1 by a first distance d_G12, and the third lens group G3 is separated from the fourth lens group G4 by a second distance. At the interval d_G34, the second lens group G2 may be located in an area spaced apart from the third lens group G3 by the third interval d_G23. Here, the first to third intervals d_G12, d_G34, and d_G23 may mean intervals between the lens groups along the optical axis OA.

In addition, when the camera module operates in the first mode, the optical system 1000 has a first TTL (TTL_1) defined as a total track length (TTL) value at the first position, and a back focal length (BFL) It may have a first BFL (BFL_1) defined as a value. Also, the optical system 1000 may have a first EFL (EFL_1) defined as a first effective focal length at the first position. Also, in the first mode, the FOV of the camera module may be less than about 25 degrees, and the F-number may be less than about 3.2.

The optical system 1000 may have excellent aberration characteristics as shown in FIGS. 3 and 4 in the first mode.

In detail, FIG. 3 is a graph of diffraction MTF characteristics of the optical system 1000 operating in the first mode (first magnification), and FIG. 4 is a graph of aberration characteristics.

It is a graph in which spherical aberration, astigmatic field curves, and distortion are measured from left to right in the aberration graph of FIG. 4 . In FIG. 4 , the X axis may represent a focal length (mm) and distortion (%), and the Y axis may represent the height of an image. In addition, a graph of spherical aberration is a graph of light in a wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and a graph of astigmatism and distortion is a graph of light in a wavelength band of 546 nm.

In the aberration diagram of FIG. 4, it can be interpreted that the aberration correction function is better as each curve approaches the Y-axis. Referring to FIG. It can be seen that it is adjacent to

Second mode (Mode 2) d_G12 (mm) 0.300 d_G23 (mm) 4.452 d_G34 (mm) 6.643 EFL_2 (mm) 33.5 EPD_2 6.57 Magnification (second magnification) 9.6 F-number 5.63 FOV (degrees) 9.67 TTL_2 (mm) 22.786 BFL_2 (mm) 0.986 ImgH (mm) 2.823

Table 6 shows the effective focal length (EFL_2) and entrance pupil size (EPD_2) for the second mode having the second magnification, and the distance (d_G12) between the first lens group G1 and the second lens group G2. ), the distance (d_G23) between the second lens group G2 and the third lens group G3, and the distance (d_G34) between the third lens group G3 and the fourth lens group G4 it is about

The camera module according to the embodiment may acquire information about a subject at various magnifications. In detail, the driving member may control the positions of the second lens group G2 and the third lens group G3, and through this, the camera module may operate at various magnifications.

For example, referring to FIGS. 5 to 7 and Tables 1 and 6, the camera module including the optical system 1000 may operate in the second mode having a second magnification. The second magnification may be about 8x to about 11x. In detail, the second magnification may be about 9.6 magnification.

In the second mode, each of the second lens group G2 and the third lens group G3 may be positioned at a location defined as a second position. When the initial positions of each of the second and third lens groups G2 and G3 are the second positions, the two lens groups G2 and G3 may not move. Alternatively, when the initial positions of each of the second lens group G2 and the third lens group G3 are different from the second position, the two lens groups G2 and G3 are driven by the driving force of the driving member. It can move to the second position.

Accordingly, each of the first to fourth lens groups G4 may be disposed at set intervals. For example, the second lens group G2 is separated from the first lens group G1 by a first distance d_G12, and the third lens group G3 is separated from the fourth lens group G4 by a second distance. At the interval d_G34, the second lens group G2 may be located in an area spaced apart from the third lens group G3 by the third interval d_G23. Here, the first to third intervals d_G12, d_G34, and d_G23 may mean intervals between the lens groups along the optical axis OA.

The first interval (d_G12) of the first mode may be greater than the first interval (d_G12) of the second mode, and the second interval (d_G34) of the first mode is the second interval (d_G34) of the second mode. ) can be smaller than Also, the third interval d_G23 of the first mode may be larger than the third interval d_G23 of the second mode.

In addition, when the camera module operates in the second mode, the optical system 1000 has a second TTL (TTL_2) defined as a total track length (TTL) value at the second position, and a back focal length (BFL) It may have a second BFL (BFL_2) defined as a value. Also, the optical system 1000 may have a second EFL (EFL_2) defined as a second effective focal length at the second position. In this case, the second EFL (EFL_2) may be greater than the first EFL (EFL_1). Also, in the second mode, the FOV of the camera module may be less than about 12 degrees, and the F-number may be less than about 6.

The optical system 1000 may have excellent aberration characteristics as shown in FIGS. 6 and 7 in the second mode.

In detail, FIG. 6 is a graph of diffraction MTF characteristics of the optical system 1000 operating in the second mode (second magnification), and FIG. 7 is a graph of aberration characteristics.

This is a graph in which spherical aberration, astigmatic field curves, and distortion are measured from left to right in the aberration graph of FIG. 7 . In FIG. 7 , the X axis may represent a focal length (mm) and distortion (%), and the Y axis may represent the height of an image. In addition, a graph of spherical aberration is a graph of light in a wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and a graph of astigmatism and distortion is a graph of light in a wavelength band of 546 nm.

In the aberration diagram of FIG. 7, it can be interpreted that the aberration correction function is better as each curve approaches the Y-axis. Referring to FIG. It can be seen that it is adjacent to

The third mode (Mode 3) d_G12 (mm) 2.665 d_G23 (mm) 4.243 d_G34 (mm) 4.487 EFL_3 (mm) 24.4 EPD_3 5.9 Magnification (third magnification) 7 F-number 4.4 FOV (degrees) 13.18 TTL_3 (mm) 22.786 BFL_3 (mm) 0.986 ImgH (mm) 2.823

Table 7 shows the effective focal length (EFL_3) and entrance pupil size (EPD_3) for the third mode having the third magnification, the distance between the first lens group G1 and the second lens group G2, the It relates to the distance between the second lens group G2 and the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4.

The camera module according to the embodiment may acquire information about a subject at various magnifications. In detail, the driving member may control the positions of the second lens group G2 and the third lens group G3, and through this, the camera module may operate at various magnifications.

For example, referring to FIGS. 8 to 10 and Tables 1 and 7, the camera module including the optical system 1000 may operate in the third mode having a third magnification. The third magnification may be about 5 to about 8 magnification. In detail, the third magnification may be about 7 magnification.

In the third mode, each of the second lens group G2 and the third lens group G3 may be located at a position defined as a third position. The third position may be an area between the first and second positions. For example, the third position of the second lens group G2 may be located between the first and second positions of the second lens group G2, and the third position of the third lens group G3 The position may be located between the first and second positions of the third lens group G3. When the initial positions of each of the second and third lens groups G2 and G3 are the third positions, the two lens groups G2 and G3 may not move. Alternatively, when the initial positions of each of the second lens group G2 and the third lens group G3 are different from the third position, the two lens groups G2 and G3 are driven by the driving force of the driving member. It can move to the third position.

Accordingly, each of the first to fourth lens groups G4 may be disposed at set intervals. For example, the second lens group G2 is separated from the first lens group G1 by a first distance d_G12, and the third lens group G3 is separated from the fourth lens group G4 by a second distance. At the interval d_G34, the second lens group G2 may be located in an area spaced apart from the third lens group G3 by the third interval d_G23. Here, the first to third intervals d_G12, d_G34, and d_G23 may mean intervals between the lens groups along the optical axis OA.

The first interval d_G12 of the third mode may be smaller than the first interval d_G12 of the first mode and may be larger than the first interval d_G12 of the second mode. The second interval of the third mode may be greater than the second interval d_G34 of the first mode and may be smaller than the second interval d_G34 of the second mode. The third interval d_G23 of the third mode may be smaller than the third interval d_G23 of the first mode and the third interval d_G23 of the second mode.

In addition, when the camera module operates in the third mode, the optical system 1000 has a third TTL (TTL_3) defined as a total track length (TTL) value at the third position, and a back focal length (BFL) It may have a third BFL (BFL_3) defined as a value. In addition, the optical system 1000 may have a third EFL (EFL_3) defined as a third effective focal length at the third position. In this case, the third EFL (EFL_2) may be larger than the first EFL (EFL_1) and smaller than the second EFL (EFL_2). Also, in the third mode, the FOV of the camera module may be less than about 17 degrees, and the F-number may be less than about 5.5.

The optical system 1000 may have excellent aberration characteristics as shown in FIGS. 9 and 10 in the second mode.

In detail, FIG. 9 is a graph of diffraction MTF characteristics of the optical system 1000 operating in the third mode (second magnification), and FIG. 10 is a graph of aberration characteristics.

This is a graph in which spherical aberration, astigmatic field curves, and distortion are measured from left to right in the aberration graph of FIG. 10 . In FIG. 7 , the X axis may represent a focal length (mm) and distortion (%), and the Y axis may represent the height of an image. In addition, a graph of spherical aberration is a graph of light in a wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and a graph of astigmatism and distortion is a graph of light in a wavelength band of 546 nm.

In the aberration diagram of FIG. 10, it can be interpreted that the aberration correction function is better as each curve approaches the Y-axis. Referring to FIG. It can be seen that it is adjacent to

The optical system 1000 and the camera module according to the embodiment may set a use area of the last lens closest to the image sensor 300 according to an operation mode. Accordingly, the optical system 1000 and the camera module can prevent deterioration of peripheral image quality characteristics at various magnifications.

For example, the camera module may operate in the second mode (FIG. 5). Part of the light incident on the eighth lens 180 passing through the seventh lens 170 in the second mode is emitted through the extreme end of the sixteenth surface S16 of the eighth lens 180. can In detail, a portion of the incident light may be emitted through an area adjacent to or at an extreme end of the effective area of the sixteenth surface S16 corresponding to the size of the effective mirror of the sixteenth surface S16. That is, in the second mode, the optical system 1000 can maximize the effective area of the sixteenth surface S16 closest to the image sensor 300 .

Also, the camera module may operate in a first mode (FIG. 1). In the second mode, a portion of the light passing through the seventh lens 170 and entering the eighth lens 180 passes through an area below the extreme end of the sixteenth surface S16 of the eighth lens 180. can be released through In detail, a portion of the incident light may be emitted through an area smaller than the size of the effective mirror of the sixteenth surface S16. That is, in the first mode, the optical system 1000 may utilize a smaller effective area of the sixteenth surface S16 closest to the image sensor 300 than in the second mode.

Also, the camera module may operate in a third mode (FIG. 8). In the third mode, a portion of the light passing through the seventh lens 170 and incident on the eighth lens 180 passes through an area below the extreme end of the sixteenth surface S16 of the eighth lens 180. can be released through In detail, a portion of the incident light may be emitted through an area smaller than the size of the effective mirror of the sixteenth surface S16. That is, in the third mode, the optical system 1000 may utilize the effective area of the sixteenth surface S16 closest to the image sensor 300 less than in the second mode and more than in the first mode. there is.

Here, the position of the most extreme region to which light can actually move among the sixteenth surface S16 may be defined as a first point. Further, a distance from the optical axis OA to a first point based on a direction perpendicular to the optical axis OA may be greater in the order of the second mode, the third mode, and the first mode.

That is, the optical system 1000 according to the embodiment may include various modes and provide an autofocus (AF) function for the subject by zooming the subject at a magnification corresponding to each mode.

In the optical system 1000 according to the embodiment, the first lens group G1 closest to the object may be disposed at a fixed position without moving. Accordingly, the first to third TTLs (TTL1, TTL2, and TTL3) may have the same value. Also, the fourth lens group G4 closest to the image sensor 300 in the optical system 1000 may be disposed at a fixed position without moving. Accordingly, the first to third BFLs (BFL1, BFL2, and BFL3) may also have the same value.

Also, in the optical system 1000 , lenses included in the fixed group and the moving group may have a non-circular shape. Accordingly, it is possible to structurally secure a space in which the second and third lens groups G2 and G3 are disposed between the first and fourth lens groups G1 and G4, and when the operation mode is changed, the second And the moving distance of the third lens groups G2 and G3 can be remarkably reduced. In detail, when the operation mode is changed, each of the second and third lens groups G2 and G3 can move within a maximum range of 6 mm or less, thereby improving power consumption characteristics. In addition, the movement distance of each of the moving groups is remarkably reduced compared to the TTL, so that the position of the moving group can be more accurately controlled.

Example CA_G1max 6.600 mm CA_G2max 4.600 mm CA_G3max 4.914 mm CA_G4max 6.500 mm CH_G1max 4.653 mm CH_G2max 3.551 mm CH_G3max 3.548 mm CH_G4max 4.647 mm L_G1 4.143 mm L_G2 2.560 mm L_G3 2.104mm L_G4 1.598 mm f_G1 -29.835 mm f_G2 7.472 mm f_G3 -8.184 mm f_G4 8.843 mm m_G2 5.248 mm m_G3 5.900 mm

math formula Example Equation 1 n_G1, n_G2, n_G3 > 1 satisfied Equation 2 0.6 < CH_G1max / CA_G1max < 1 0.705 Equation 3 0.7 < CH_G2max / CA_G2max < 1 0.772 Equation 4 0.7 < CH_G3max / CA_G3max < 1 0.722 Equation 5 0.6 < CH_G4max / CA_G4max < 1 0.715 Equation 6 1 < CH_G1max / CH_G2max < 2 1.310 Equation 7 1 < CH_G4max / CH_G3max < 2 1.309 Equation 8 0.9 < CH_G1max / CH_G4max < 1.1 1.001 Equation 9 0.9 < CH_G2max / CH_G3max < 1.1 1.000 Equation 10 CH_G1max / CH_G2max < CA_G1max / CA_G2max
CH_G4max / CH_G3max < CA_G4max / CA_G3max
CH_G1max / CH_G4max < CA_G1max / CA_G4max satisfied Equation 11 0.6 < CH_LnSm / CA_LnSm < 1
(1 < n, m= 1 or 2, except for L3S2) satisfied Equation 12 CH_L1S1 / CA_L1S1 < CH_LnSm / CA_LnSm
(1 < n, m= 1 or 2, except for L3S2) satisfied Equation 13 CH_L3S2 / CA_L3S2 = 1 satisfied Equation 14 1 < L_G1 / L_G2 < 3 1.619 Equation 15 1 < L_G1 / L_G3 < 3 1.969 Equation 16 0.05 < L_G1 / TTL < 0.5 0.182 Equation 17 20 < |vd4 - vd5| satisfied Equation 18 20 < |vd6 - vd7| satisfied Equation 19 1 < L1R1 / L3R2 < 2 1.630 Equation 20 1 < L1R1 / L4R1 < 2 1.661 Equation 21 1.1 < CA_L1S1 / CA_L3S2 < 1.7 1.463 Equation 22 1.1 < CA_L1S1 / CA_L4S1 < 1.7 1.435 Equation 23 0.05 < m_G2 / TTL < 0.35 0.230 Equation 24 0.05 < m_G3 / TTL < 0.35 0.259 Equation 25 1.5 < m_G2 / L_G2 < 2.5 2.050 Equation 26 2 < m_G3 / L_G3 < 3.5 2.804 Equation 27 4 < d_G12_mode1 / d_G34_mode1 < 12 7.467 Equation 28 0.01 < d_G12_mode2 / d_G34_mode2 < 0.5 0.045 Equation 29 0.1 < EFL_1 / EFL_2 < 1 0.454 Equation 30 2 < EFL_1 / EPD_1 < 3 2.895 Equation 31 4.5 < EFL_2 / EPD_2 < 6 5.099 Equation 32 F#_Mode1 < 3.5
F#_Mode2 < 6.0 satisfied Equation 33 1 < TTL / EFL_1 < 3 1.499 Equation 34 0.1 < TTL / EFL_2 < 1 0.680 Equation 35 1 < CA_Smax / ImgH < 4 2.338 Equation 36 5 < TTL / ImgH < 10 8.073 Equation 37 15 < TTL / BFL < 30 23.117 Equation 38 2 < ImgH / BFL < 4 2.864

Table 8 relates to the items of the above-described equations in the optical system and camera module according to the embodiment, the focal length of each of the plurality of lenses 100, and the total length of the plurality of lens groups G1, G2, G3, and G4. and focal lengths, and movement distances of the second and third lens groups G2 and G3.

Also, Table 9 relates to result values of Equations 1 to 38 of the optical system 1000 and the camera module according to the embodiment.

Referring to Table 9, it can be seen that the optical system 1000 and the camera module according to the embodiment satisfy at least one of Equations 1 to 38. In detail, it can be seen that the camera module according to the embodiment satisfies all of Equations 1 to 38 above.

Accordingly, the embodiment can provide an optical system having various magnifications by moving at least one lens group and having excellent optical characteristics when providing various magnifications. In detail, the embodiment may have a plurality of lenses 100 having a set number of lenses, a lens group having refractive power, a set shape and focal length, and a non-circular shape. In addition, the embodiment may provide an autofocus (AF) function for the subject at various magnifications by controlling the moving distance of the moving lens group. Accordingly, according to the embodiment, a subject can be photographed at various magnifications using one camera module, and optical performance can be prevented from deteriorating at each magnification.

In particular, referring to FIGS. 3, 4, 6, 7, 9, and 10, it can be seen that the optical system 1000 according to the embodiment shows little or no significant change in optical characteristics even when the operation mode is changed. there is. In detail, it can be seen that even when the magnification is changed within the first to third magnification ranges due to the position change of the second and third lens groups G2 and G3, there is little or no change in MTF characteristics and aberration characteristics. there is. That is, it can be seen that the optical system 1000 according to the embodiment maintains excellent optical characteristics even when the magnification is changed within the first to third magnification ranges.

In addition, the embodiment can control the effective focal length (EFL) by moving only some of the plurality of lens groups, and can minimize the movement distance of the moving lens group. For example, in the embodiment, the moving lens group may have a moving distance of 6 mm or less. Accordingly, the optical system 1000 according to the embodiment can significantly reduce the moving distance of the lens group when the magnification is changed, and can minimize power consumption required when the lens group is moved.

In addition, the optical system 1000 according to the embodiment may correct aberration characteristics of each of a plurality of lens groups or mutually supplement aberration characteristics that change due to movement. Accordingly, the optical system 1000 according to the embodiment can minimize or prevent a chromatic aberration change occurring when magnification is changed.

Also, according to the embodiment, the magnification may be adjusted by moving a lens group other than the first lens group adjacent to the subject among the plurality of lens groups. Accordingly, the optical system 1000 may have a constant TTL value even when the lens group moves according to the magnification change. Accordingly, the optical system 1000 and the camera module including the optical system 1000 may be provided with a slimmer structure.

11 is a diagram illustrating that a camera module according to an embodiment is applied to a mobile terminal.

Referring to FIG. 11 , the mobile terminal 1 may include a camera module 10 provided on the rear side.

The camera module 10 may include an image capturing function. In addition, the camera module 10 may include at least one of an auto focus function, a zoom function, and an OIS function.

The camera module 10 may process a still image or video frame obtained by the image sensor 300 in a shooting mode or a video call mode. The processed image frame may be displayed on a display unit (not shown) of the mobile terminal 1 and may be stored in a memory (not shown). In addition, although not shown in the drawings, the camera module may be further disposed on the front side of the mobile terminal 1 .

For example, the camera module 10 may include a first camera module 10A and a second camera module 10B. At this time, at least one of the first camera module 10A and the second camera module 10B may include the above-described optical system 1000 . Accordingly, the camera module 10 may have a slim structure, and may capture a subject at various magnifications.

In addition, the mobile terminal 1 may further include an auto focus device 31 . The auto focus device 31 may include an auto focus function using a laser. The auto-focus device 31 may be mainly used in a condition in which an auto-focus function using an image of the camera module 10 is degraded, for example, a proximity of 10 m or less or a dark environment. The autofocus device 31 may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device and a light receiving unit such as a photodiode that converts light energy into electrical energy.

In addition, the mobile terminal 1 may further include a flash module 33. The flash module 33 may include a light emitting element emitting light therein. The flash module 33 may emit light in a visible light wavelength band. For example, the flash module 33 may emit white light or light of a color similar to white. However, the embodiment is not limited thereto and the flash module 33 may emit light of various colors. The flash module 33 may be operated by a camera operation of a mobile terminal or a user's control.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, and effects illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

In addition, although the above has been described with a focus on the embodiments, these are only examples and do not limit the present invention, and those skilled in the art to which the present invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be seen that various variations and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

Optics: 1000
1st lens: 110 2nd lens: 120
3rd lens: 130 4th lens: 140
5th lens: 150 6th lens: 160
7th lens: 170 8th lens: 180
Image Sensor: 300 Filter: 500

Claims (16)

It includes first to fourth lens groups disposed along an optical axis in a direction from the object side to the sensor side, and each including at least one lens;
The first lens group has a refractive power opposite to that of the fourth lens group,
The second lens group has a refractive power opposite to that of the third lens group,
The first and fourth lens groups are fixed, and the second and third lens groups are movable in the optical axis direction;
At least one of the first and fourth lens groups includes at least one non-circular lens having an effective area having a non-circular shape;
At least one of the second and third lens groups includes at least one non-circular lens having an effective area having a non-circular shape;
The non-circular lens has a non-circularity (CH / CA) greater than 0.6,
The non-circularity is the ratio of the minimum clear height (CH) and the maximum clear aperture (CA) of the lens surface having the largest clear aperture (CA) among the object side and the sensor side of the non-circular lens. . According to claim 1,
The first lens group includes first to third lenses sequentially disposed along the optical axis in a direction from the object side to the sensor side;
The second lens group includes fourth and fifth lenses sequentially arranged along the optical axis in a direction from the object side to the sensor side;
The third lens group includes sixth and seventh lenses sequentially arranged along the optical axis in a direction from the object side to the sensor side;
The fourth lens group includes an eighth lens. According to claim 2,
The first lens has a non-circular shape,
The non-circularity of the first lens is greater than 0.6 and less than 1 optical system. According to claim 3,
Among the first to eighth lenses, an optical system having the smallest non-circularity of the first lens. According to claim 4,
The seventh lens has a non-circular shape,
The non-circularity of the seventh lens is greater than 0.7 and less than 1. According to claim 5,
Among the fourth to seventh lenses, an optical system having the smallest non-circularity of the seventh lens. According to claim 3,
The optical system of claim 1 , wherein the first lens has a meniscus shape convex from the optical axis toward the object side. According to claim 2,
The first to eighth lenses all have a non-circular shape. According to claim 2,
An effective area of the object-side surface of the third lens has a non-circular shape, and an effective area of the sensor-side surface has a circular shape. It includes first to fourth lens groups disposed along an optical axis in a direction from the object side to the sensor side, and each including at least one lens;
The first lens group has a refractive power opposite to that of the fourth lens group,
The second lens group has a refractive power opposite to that of the third lens group,
The first and fourth lens groups are fixed and the second and third lens groups are movable in the optical axis direction;
At least one of the first and fourth lens groups includes at least one non-circular lens having an effective area having a non-circular shape;
At least one of the second and third lens groups includes at least one non-circular lens having an effective area having a non-circular shape;
When the second and third lens groups are located in the first position, they have a first effective focal length (EFL),
When the second and third lens groups are located at a second position different from the first position, they have a second effective focal length;
The second effective focal length is greater than the first effective focal length. According to claim 10,
At the first position, the optical system has a first magnification;
At the second position, the optical system has a second magnification greater than the first magnification. According to claim 11,
The optical system satisfies the following equation.
0.05 < m_G2 / TTL < 0.35
(m_G2 is a movement distance when the second lens group moves from the first position to the second position or from the second position to the first position. In addition, TTL (Total track length) is the first It is the distance on the optical axis from the object side surface of the lens closest to the object in the lens group to the image surface of the sensor.) According to claim 11,
The optical system satisfies the following equation.
0.05 < m_G3 / TTL < 0.35
(m_G3 is a movement distance when the third lens group moves from the first position to the second position or from the second position to the first position. In addition, TTL (Total track length) is the first It is the distance on the optical axis from the object side surface of the lens closest to the object in the lens group to the image surface of the sensor.) According to claim 11,
The first magnification is the lowest magnification of the optical system and the second magnification is the highest magnification of the optical system,
When the second and third lens groups are located at the first position, the F-number of the optical system is less than 3.5,
When the second and third lens groups are located in the second position, the F-number of the optical system is less than 6. According to claim 11,
When the second and third lens groups move from the first position to the second position or from the second position to the first position, the movement distance of each of the second and third lens groups is 6 mm or less. Including an optical system and a driving member,
The optical system includes an optical system according to any one of claims 1 to 15,
The driving member controls positions of the second and third lens groups.

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