Portable electronic device, optical imaging system, and lens assembly

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, sequentially disposed from an object side, wherein the first to fifth lenses are spaced apart from each other by predetermined distances along an optical axis in a paraxial region, the first lens and the second lens each have a non-circular shape when viewed in an optical axis direction, and the optical imaging system satisfies 0.62398<ZS1/ZS2<1.36318, where ZS1 is a ratio of an area of an object-side surface of the first lens to a distance from the object-side surface of the first lens to an imaging plane of an image sensor, and ZS2 is a ratio of an area of an object-side surface of the second lens to a distance from the object-side surface of the second lens to the imaging plane of the image sensor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 U.S.C. 119(a) of Korean Patent Application No. 10-2018-0098221 filed on Aug. 22, 2018, Korean Patent Application No. 10-2018-0110439 filed on Sep. 14, 2018, and Korean Patent Application No. 10-2019-0025946 filed on Mar. 6, 2019, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes.

BACKGROUND

This disclosure relates to a portable electronic device, an optical imaging system, and a lens assembly.

2. Description of the Background

A camera module may be used in portable electronic devices such as smartphones. Recently, miniaturization of a camera module mounted on the portable electronic devices has been demanded due to demand for miniaturization of the portable electronic devices.

However, when a size of a camera module is simply reduced, there may be a problem that performance of the camera modules may deteriorate. Therefore, research for reducing the size of the camera module may be required while maintaining or improving the performance of the camera module.

In general, since a lens of the camera module is substantially circular, and an image sensor of the camera module is rectangular, not all light refracted by the lens may be captured on the image sensor.

Accordingly, a method of reducing the size of the camera module by removing unnecessary portions from the lens to reduce the size of the lens may be considered.

However, when only a portion of the lens is simply removed, optical performance of the lens may be deteriorated to lower quality of the captured image.

SUMMARY

In one general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, sequentially disposed from an object, wherein the first to fifth lenses are spaced apart from each other by predetermined distances along an optical axis in a paraxial region, the first lens and the second lens each have a non-circular shape when viewed in an optical axis direction, and the optical imaging system satisfies 0.62398<ZS1/ZS2<1.36318, where ZS1 is a ratio of an area of an object-side surface of the first lens to a distance on the optical axis from the object-side surface of the first lens to an imaging plane of an image sensor, and ZS2 is a ratio of an area of an object-side surface of the second lens to a distance on the optical axis from the object-side surface of the second lens to the imaging plane of the image sensor.

The optical imaging system may further satisfy 1.607 mm<ZS1<2.014 mm.

The optical imaging system may further satisfy 1.838 mm<ZS2<2.303 mm.

The first lens may include a first side surface and a second side surface, each having an arc shape when viewed in the optical axis direction, and a third side surface and a fourth side surface connecting the first side surface and the second side surface, and the optical imaging system may further satisfy 73.9 degrees<α<106.4 degrees, where α is an angle between a first imaginary line connecting the optical axis and a connection point between the first side surface and the fourth side surface and a second imaginary line connecting the optical axis and a connection point between the second side surface and the fourth side surface.

The optical imaging system may further satisfy 0.599<AR<0.799, where a line segment connecting the third side surface and the fourth side surface through the optical axis in a shortest distance represents a minor axis, a line segment connecting the first side surface and the second side surface through the optical axis and perpendicular to the minor axis represents a major axis, and AR is a ratio of a length of the minor axis to a length of the major axis.

The third to fifth lenses may each include a non-circular shape when viewed in the optical axis direction, and the optical imaging system may further satisfy 92.4 degrees<α<121.0 degrees.

The optical imaging system may further satisfy 1.351 mm<ZS1<1.811 mm and 1.545 mm<ZS2<2.07 mm.

The optical imaging system may further include a sixth lens and a seventh lens. The third to seventh lenses may each have a non-circular shape when viewed in the optical axis direction. The optical imaging system may further satisfy 79.4 degrees<α<126.4 degrees,

The optical imaging system may further satisfy 1.106 mm<ZS1<1.828 mm and 1.194 mm<ZS2<1.975 mm.

The optical imaging system may further satisfy 86.2 degrees<α<116.0 degrees.

The optical imaging system may further satisfy 1.1 mm<ZS1<1.438 mm and 1.258 mm<ZS2<1.644 mm.

A length of a relative long side of the image sensor may be 1.5 times or more a length of a relative short side of the image sensor. The optical imaging system may further satisfy 101.3 degrees<α<128.6 degrees.

The optical imaging system may further satisfy 0.916 mm<ZS1<1.284 mm and 1.048 mm<ZS2<1.468 mm.

The optical imaging system may further satisfy 109.2 degrees<α<135.4 degrees.

The optical imaging system may further satisfy 0.920 mm<ZS1<1.355 mm and 0.994 mm<ZS2<1.464 mm.

The optical imaging system may be a portable electronic device, further including a display. The image sensor may be configured to convert light incident through the first through fifth lenses to an electric signal and the display may be configured to display an image based on the electric signal.

In another general aspect, a lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an image sensor, sequentially disposed from an object side, wherein the first to fifth lenses are spaced apart from each other by predetermined distances along an optical axis in a paraxial region, the first lens and the second lens each have a non-circular shape when viewed in an optical axis direction, the first lens and the second lens each include an optical portion for refracting light and a flange portion extending along a periphery of at least a portion of the optical portion, and the optical imaging system satisfies 0.73598<ZS′1/ZS′2<1.37987, where ZS′1 is a ratio of an area of the optical portion on an object-side surface of the first lens to a distance on the optical axis from the object-side surface of the first lens to an imaging plane of the image sensor, and ZS′2 is a ratio of an area of the optical portion on an object-side surface of the second lens to a distance on the optical axis from the object-side surface of the second lens to the imaging plane of the image sensor.

In another general aspect, a portable electronic device includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an image sensor configured to convert light incident through the first through fifth lenses to an electric signal, sequentially disposed along an optical axis from an object side, a reflection member disposed in front of the first to fifth lenses and configured to change a traveling direction of light from a thickness direction of the portable electronic device to an optical axis direction, and a display unit configured to display an image based on the electric signal, wherein the first lens and the second lens each have a non-circular shape when viewed in the optical axis direction, the first lens and the second lens each include an optical portion for refracting light and a flange portion extending along a periphery of a portion of the optical portion, and wherein the flange portion is disposed on opposite sides of the optical portion spaced apart in a direction perpendicular to the thickness direction of the portable electronic device.

DETAILED DESCRIPTION

The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and/or systems described herein that will be apparent after an understanding of this disclosure. Hereinafter, while embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, it is noted that examples are not limited to the same.

Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween. Also, when one element is “electrically connected to” another element, they may be physically connected to each other, or they may be not in physical contact with each other.

One or more examples of a portable electronic device, an optical imaging system, and a lens assembly that may have reduced size and improved performance are described herein.

FIG. 1is a perspective view of a portable electronic device according to an embodiment of the present disclosure.

Referring toFIG. 1, a portable electronic device1000according to an exemplary embodiment of the present disclosure may be a portable electronic device, such as a mobile communications terminal, a smartphone, or a tablet PC, including a camera module1.

As illustrated inFIGS. 1, 2, and 3, the camera module1may be mounted on the portable electronic device1000to photograph a subject. The camera module1may include a lens assembly2.

The lens assembly2may include an optical imaging system3and an image sensor S, and may further include a reflection member R (seeFIG. 3). The optical imaging system3may include a plurality of lenses.

In an embodiment of the present disclosure, the camera module1may be configured such that an optical axis (a z axis) of the plurality of lenses may be disposed in a direction, perpendicular to a thickness direction of the portable electronic device1000(a Y axis direction, i.e., a direction from a front surface of the portable electronic device1000to a rear surface thereof, or in an opposite direction).

For example, the optical axis (Z-axis) of the plurality of lenses provided in the camera module1may be formed in a width direction or a longitudinal direction of the portable electronic device1000.

Therefore, even when the camera module1has functions such as Auto Focusing (hereinafter, referring to as “AF”), Optical Zoom (hereinafter, referring to as “Zoom”), and Optical Image Stabilization (hereinafter, referring to as “OIS”), it may be prevented from a further increase in a thickness of the portable electronic device1000. Therefore, the portable electronic device1000may be miniaturized.

The camera module1according to an embodiment of the present disclosure may include at least one of the AF, Zoom, and OIS functions.

In the case of the camera module1having the AF, Zoom, and OIS functions, a size of the camera module1may be increased compared to a size of a conventional camera module.

As the size of the camera module1increases, the size of the portable electronic device1000on which the camera module1is mounted may be also affected. Therefore, there is a limitation to the miniaturization of the portable electronic device1000.

For example, the camera module needs to change a focal length of the optical imaging system3in order to realize the Zoom function. In this case, space may be required to move at least a portion of the plurality of lenses.

When the optical axis (the z axis) of the plurality of lenses is formed in the thickness direction (the Y axis direction) of the portable electronic device1000, a thickness of the portable electronic device1000may also increase. In a case in which the thickness of the portable electronic device1000does not increase, space for moving the lenses may be not sufficient. Therefore, it may be difficult to implement the Zoom function.

In order to realize the AF and OIS functions, an actuator for moving the optical imaging system3in the optical axis direction, and in a direction, perpendicular to the optical axis, should be provided. When the optical axis (the z axis) is provided in the thickness direction (the Y axis direction) of the portable electronic device1000, the thickness of the portable electronic device1000may increase due to the actuator for moving the optical imaging system3.

Since the camera module1according to an embodiment of the present disclosure may be arranged such that the optical axis (the z axis) of the plurality of lenses is disposed perpendicular to the thickness direction (the Y axis direction) of the portable electronic device1000, the thickness of the portable electronic device1000may be prevented from being increased, even when the camera module1having the OIS function is mounted on the portable electronic device1000. Therefore, the portable electronic device1000may be miniaturized.

FIG. 2is a schematic perspective view of an optical imaging system according to an embodiment of the present disclosure, andFIG. 3is a schematic cross-sectional view of a lens assembly according to an embodiment of the present disclosure.

Referring toFIGS. 2 and 3, a lens assembly2according to an embodiment of the present disclosure may include an optical imaging system3including a plurality of lenses L1, L2, L3, L4, and L5, an infrared light blocking filter IR, and an image sensor S, and may further include a reflection member R.

The reflection member R may be disposed in front of the plurality of lenses L1, L2, L3, L4, and L5, and may be configured to change a traveling direction of light. Therefore, a path of light incident on the camera module1may be changed by the reflection member R.

For example, the light incident on the camera module1may be changed in the traveling direction by the reflection member R to face the plurality of lenses L1, L2, L3, L4, and L5.

The reflection member R may be a mirror or a prism that reflects light.

The infrared light blocking filter IR may function to block light in an infrared light region of light incident through the plurality of lenses L1, L2, L3, L4, and L5.

The image sensor S may convert light incident through the plurality of lenses L1, L2, L3, L4, and L5into electric signals. For example, the image sensor S may be an electric charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS).

The portable electronic device1000may include a display unit5disposed on a surface of the portable electronic apparatus1000to display an image based on the electric signals of the image sensor S. For example, the display unit5may include a liquid crystal display (LCD), a light-emitting diode (LED), an organic light-emitting diode (OLED), etc., or combinations thereof.

The plurality of lenses L1, L2, L3, L4, and L5may include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, sequentially disposed in numerical order in a direction from an object side of the optical imaging system to an image side thereof. Six or more of lenses may be included when necessary.

The plurality of lenses L1, L2, L3, L4, and L5may be spaced apart from neighboring lenses by a predetermined distance.

At least a portion of the plurality of lenses L1, L2, L3, L4, and L5may have a non-circular planar shape. For example, the first lens L1and the second lens L2may be formed in a non-circular shape, and the third lens L3to the fifth lens L5may be formed in a circular shape (seeFIG. 2).

Here, the term “circular shape” refers to not only a complete circle, but also a partly cut shape in which a gate portion of a plastic injection lens is cut off.

Therefore, the third lens L3to the fifth lens L5may be a partly cut shape in which a portion of a circle is cut off by cutting the gate portion, which may be a moving passage of a resin material, for example, an injection portion for injection molding formation of the lens.

Here, the term “non-circular shape” refers that the lens may be not circular in a region other than the gate portion of the plastic injection lens.

The first lens L1may have four side surfaces, and two side surfaces among them may be formed to face each other. Further, the side surfaces facing each other may have shapes corresponding to each other.

For example, when viewed in the optical axis direction, the first side surface and the second side surface of the first lens L1may have an arc shape, and the third side surface and the fourth side surface may have a substantially straight shape. The gate portion, which may be a moving passage of the resin material, may be formed on either the first side surface or the second side surface.

A shape of the second lens L2may be substantially similar to a shape of the first lens L1, and the first lens L1will be described below for convenience of explanation.

All of the plurality of lenses L1, L2, L3, L4, and L5may have a non-circular planar shape.

FIGS. 4 and 5are plan views of a first lens of an optical imaging system according to an embodiment of the present disclosure.

Referring toFIG. 4, a first lens L1may have four side surfaces, and two side surfaces among them may be formed to face each other. Further, the side surfaces facing each other may have shapes corresponding to each other.

For example, when viewed in the optical axis direction, a first side surface21and a second side surface22of the first lens L1may have an arc shape, and a third side surface23and a fourth side surface24may have a substantially straight shape.

The third side surface23and the fourth side surface24may connect the first side surface21and the second side surface22, respectively.

The third side surface23and the fourth side surface24may be symmetrical about the optical axis, and may be formed to be parallel to each other.

The first lens L1may have a major axis (a) and a minor axis (b). For example, as illustrated inFIG. 4, when viewed in the optical axis direction, a line segment connecting the third side surface23and the fourth side surface24through the optical axis (the z axis) in a shortest distance represents a minor axis (b), and a line segment connecting the first side surface21and the second side surface22through the optical axis (the z axis) and perpendicular to the minor axis (b) represents a major axis (a).

The first lens L1may include an optical portion10and a flange portion30.

The optical portion10may be a portion in which optical performance of the first lens L1is exerted. For example, light reflected from a subject may be refracted while passing through the optical portion10.

The optical portion10may have positive or negative refractive power, and may have a spherical or non-spherical shape.

The flange portion30may be a portion for fixing the first lens L1to another component, for example, a lens barrel or the second lens L2.

The flange portion30may extend around at least a portion of the optical portion10, and may be formed integrally with the optical portion10.

The optical portion10and the flange portion30may be formed in a non-circular shape. For example, the optical portion10and the flange portion30may be non-circular when viewed in the optical axis direction (seeFIG. 4). Alternatively, the optical portion10may have a circular shape, and the flange portion30may have a non-circular shape.

Referring toFIG. 5, an optical portion10may include a first edge11, a second edge12, a third edge13, and a fourth edge14. The first edge11and the second edge12may be located opposite to each other, and the third edge13and the fourth edge14may be located opposite to each other.

The third edge13and the fourth edge14may connect the first edge11and the second edge12, respectively.

When viewed in the optical axis direction, the first edge11and the second edge12may have an arc shape, and the third edge13and the fourth edge14may have a substantially straight shape.

The third edge13and the fourth edge14may be symmetrical about the optical axis (the z axis), and may be formed to be parallel to each other.

The optical portion10may have a major axis (c) and a minor axis (d). For example, when viewed in the optical axis direction, a line segment connecting the third edge13and the fourth edge14through the optical axis (the z axis) in a shortest distance represents a minor axis (d), and a line segment connecting the first edge11and the second edge12through the optical axis (the z axis) and perpendicular to the minor axis (d) represents a major axis (c).

A flange portion30may include a first flange portion31and a second flange portion32. The first flange portion31may extend from the first edge11of the optical portion10, and the second flange portion32may extend from the second edge12of the optical portion10.

The first edge11of the optical portion10may refer to a portion adjacent to the first flange portion31, and the second edge12of the optical portion10may refer to a portion adjacent to the second flange portion32.

The third edge13of the optical portion10may refer to a side surface of the optical portion10in which the flange portion30is not formed, and the fourth edge14of the optical portion10may refer to the other side surface of the optical portion10in which the flange portion30is not formed.

The first lens L1may be made of a plastic material, and may be injection-molded through a mold. Here, the third edge13and the fourth edge14of the first lens L1according to an embodiment of the present disclosure may be formed to have the above-described shape during an injection molding operation, but may not be formed by cutting a portion of the lens after the injection molding operation.

When a portion of the lens is removed after the injection molding operation, the lens may be deformed by force applied to the lens in the course of the injection molding operation. When the lens is deformed, optical performance of the lens may inevitably be changed.

Since the first lens L1according to an embodiment of the present disclosure is formed in a non-circular shape when the first lens L1is injected, a size of the first lens L1may be reduced, and performance of the first lens L1may be ensured.

FIGS. 6 and 7are plan views illustrating a non-circular lens of a lens assembly according to an embodiment of the present disclosure.

Referring toFIG. 6, in an embodiment of the present disclosure, at least a portion of a lens of a lens assembly2may be formed in a non-circular shape. For example, the non-circular lens may have a first side surface21, a second side surface22, a third side surface23, and a fourth side surface24. When viewed in the optical axis direction, the first side surface21and the second side surface22may have an arc shape, and the third side surface23and the fourth side surface24may have a substantially straight shape.

The gate portion, which may be a moving passage of a resin material, may be formed on either the first side surface21or the second side surface22, but is not illustrated inFIG. 6.

Referring toFIG. 6, a dashed line refers to a first imaginary line (P1) connecting an optical axis (a z axis) and a connection point between a first side surface21and a fourth side surface24(or a third side surface23) of a non-circular lens, and a second imaginary line (P2) connecting an optical axis (a z axis) and a connection point between a second side surface22and a fourth side surface24(or a third side surface23) of a non-circular lens. A dashed-dotted line refers to an angle (α) between the two imaginary lines.

In an embodiment of the present disclosure, ZS is defined as a ratio of an area of an object-side surface of a non-circular lens to the total length.

A refers to an area of an object-side surface of a non-circular lens. The area of the object-side surface refers to the sum of areas of an optical portion10and a flange portion30.

n refers to a constant for designating a specific lens. For example, A1 refers to an area of an object-side surface of a first lens L1, and A2 refers to an area of an object-side surface of a second lens L2.

I refers to the total track length. The total track length refers to a distance of an optical axis from an object-side surface of a non-circular lens to an imaging plane of an image sensor S. For example, l1 refers to a distance of an optical axis from an object-side surface of a first lens L1to an imaging plane of an image sensor S, l2 refers to a distance of an optical axis from an object-side surface of a second lens L2to an imaging plane of an image sensor S, and l3 refers to a distance of an optical axis from an object-side surface of a third lens L3to an imaging plane of an image sensor S (seeFIG. 3).

α refers to an angle between a first imaginary line (P1) connecting an optical axis (a z axis) and a connection point between a first side surface21and a fourth side surface24and a second imaginary line (P2) connecting an optical axis (a z axis) and a connection point between a second side surface22and a fourth side surface24. For example, α1 refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1, and α2 refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the second lens L2.

Referring toFIG. 7, in an embodiment of the present disclosure, an optical portion10may be formed in a non-circular shape. For example, the optical portion10may include a first edge11, a second edge12, a third edge13, and a fourth edge14. When viewed in the optical axis direction, the first edge11and the second edge12may have an arc shape, and the third edge13and the fourth edge14may have a substantially straight shape.

Referring toFIG. 7, a dotted line refers to an area through which light actually passes. A dashed line refers to a first imaginary line (P1′) connecting an optical axis (a z axis) and a connection point between a first edge11and a fourth edge14(or a third edge13) of an optical portion10, and a second imaginary line (P2′) connecting an optical axis (a z axis) and a connection point between a second edge12and a fourth edge14(or a third edge13) of an optical portion10. A dashed-dotted line refers to an angle (α′) between the two imaginary lines.

In an embodiment of the present disclosure, ZS′ is defined as a ratio of an area of an optical portion10to the total length.

A′ refers to an area of an optical portion10in an object-side surface of a non-circular lens.

n refers to a constant for designating a specific lens. For example, A′1 refers to an area of an optical portion10in an object-side surface of a first lens L1, and A′2 refers to an area of an optical portion10in an object-side surface of a second lens L2.

I refers to the total track length. The total track length refers to a distance of an optical axis from an object-side surface of a non-circular lens to an imaging plane of an image sensor S. For example, l1 refers to a distance of an optical axis from an object-side surface of a first lens L1to an imaging plane of an image sensor S, l2 refers to a distance of an optical axis from an object-side surface of a second lens L2to an imaging plane of an image sensor S, and l3 refers to a distance of an optical axis from an object-side surface of a third lens L3to an imaging plane of an image sensor S (seeFIG. 3).

α′ refers to an angle between a first imaginary line (P1′) connecting an optical axis (a z axis) and a connection point between a first edge11and a fourth edge14and a second imaginary line (P2′) connecting an optical axis (a z axis) and a connection point between a second edge12and a fourth edge14. For example, α′1 refers to an angle between the first imaginary line (P1′) and the second imaginary line (P2′) of the first lens L1, and α′2 refers to an angle between the first imaginary line and the second imaginary line of the second lens L2.

As a first embodiment of a lens assembly2, a case in which a first lens L1and a second lens L2among a plurality of lenses are non-circular and the other lenses are circular will be described. A plurality of lenses includes a first lens L1to a fifth lens L5. In the first embodiment of the lens assembly2, the lens assembly2has a fixed focal length. Also, the lens assembly2has an F-number (hereinafter, referred to as “FNO”) of 2.8. FNO refers to a constant indicating brightness of a lens assembly2.

The first lens L1satisfies the following Conditional Expression 1-1, and the second lens L2 satisfies the following Conditional Expression 1-2.
1.607 mm<ZS1<2.014 mm   [Conditional Expression 1-1]
1.838 mm<ZS2<2.303 mm   [Conditional Expression 1-2]

In Conditional Expression 1-1, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 1-2, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In the first embodiment, the first lens L1and the second lens L2satisfy at least one of the following Conditional Expressions 1-3 and 1-4.
73.9 degrees<α<106.4 degrees   [Conditional Expression 1-3 ]
0.599<AR<0.799   [Conditional Expression 1-4]

In Conditional Expression 1-3, a refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1.

In Conditional Expression 1-4, AR refers to an aspect ratio of the object-side surface of the first lens L1. AR refers to a ratio (b/a) of a length of the minor axis (b) of the first lens L1to a length of the major axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary line of the second lens L2, and an aspect ratio of the object-side surface of the second lens L2refer to the same characteristics as previously described with regard to the first lens L1.

The first lens L1satisfies at least one of the following Conditional Expressions 1-5 to 1-7.
1.218 mm<ZS′1<1.477 mm   [Conditional Expression 1-5]
61.6 degrees<α′1<97.5 degrees   [Conditional Expression 1-6]
0.659<AR′1<0.859   [Conditional Expression 1-7]

In Conditional Expression 1-5, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

In Conditional Expression 1-6, α′1 refers to an angle between a first imaginary line (P1′) connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion10of the first lens L1and a second imaginary line (P2′) connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion10of the first lens L1.

In Conditional Expression 1-7, AR′1 refers to an aspect ratio of the optical portion10in the object-side surface of the first lens L1. AR′1 refers to a ratio (d/c) of a length of the minor axis (d) of the optical portion10of the first lens L1to a length of the major axis (c) of the optical portion10of the first lens L1.

The second lens L2satisfies at least one of the following Conditional Expressions 1-8 to 1-10.
1.221 mm<ZS′2<1.404 mm   [Conditional Expression 1-8]
34.7 degrees<α′2<82.0 degrees   [Conditional Expression 1-9]
0.755<AR′2<0.955   [Conditional Expression 1-10]

In Conditional Expression 1-8, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

In Conditional Expression 1-9, α′2 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion of the second lens L2and a second imaginary line connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion of the second lens L2.

In Conditional Expression 1-10, AR′2 refers to an aspect ratio of the optical portion in the object-side surface of the second lens L2. AR′2 refers to a ratio of a length of the minor axis of the optical portion of the second lens L2to a length of the major axis of the optical portion of the second lens L2.

The following Table 1 illustrates an embodiment of a lens assembly2satisfying the above Conditional Expressions 1-1 to 1-10. In the following Tables 1 to 6, a unit of the total length is mm.

The first lens L1and the second lens L2are configured to be aligned with respect to each other. For example, the first lens L1and the second lens L2are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1and a flange portion of an object-side surface of the second lens L2have a concavo-convex structure, respectively, and the concavo-convex structure of the first lens L1and the concavo-convex structure of the second lens L2are configured to be coupled to each other such that the optical axis is aligned.

As a second embodiment of a lens assembly2, a case in which all of a plurality of lenses are non-circular will be described. The plurality of lenses include a first lens L1to a fifth lens L5. In the second embodiment of the lens assembly2, the lens assembly2has a fixed focal length. Also, the lens assembly2has an FNO of 2.8. FNO refers to a constant indicating brightness of a lens assembly2.

The first lens L1satisfies the following Conditional Expression 2-1, the second lens L2satisfies the following Conditional Expression 2-2, the third lens L3satisfies the following Conditional Expression 2-3, the fourth lens L4satisfies the following Conditional Expression 2-4, and the fifth lens L5satisfies the following Conditional Expression 2-5.
1.351 mm<ZS1<1.811 mm   [Conditional Expression 2-1]
1.545 mm<ZS2<2.070 mm   [Conditional Expression 2-2]
1.869 mm<ZS3<2.504 mm   [Conditional Expression 2-3]
1.994 mm<ZS4<2.672 mm   [Conditional Expression 2-4]
2.318 mm<ZS5<3.107 mm   [Conditional Expression 2-5]

In Conditional Expression 2-1, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 2-2, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 2-3, ZS3 refers to a ratio (A3/l3) of an area (A3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A3) of the object-side surface of the third lens L3refers to the total area of the object-side surface of the third lens L3(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 2-4, ZS4 refers to a ratio (A4/l4) of an area (A4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of the object-side surface of the fourth lens L4refers to the total area of the object-side surface of the fourth lens L4(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 2-5, ZS5 refers to a ratio (A5/l5) of an area (A5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A5) of the object-side surface of the fifth lens L5refers to the total area of the object-side surface of the fifth lens L5(the sum of an area of an optical portion and an area of a flange portion).

In the second embodiment, the first lens L1to the fifth lens L5satisfy at least one of the following Conditional Expressions 2-6 and 2-7.
92.4 degrees<α<121.0 degrees   [Conditional Expression 2-6]
0.492<AR<0.692   [Conditional Expression 2-7]

In Conditional Expression 2-6, a refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1.

In Conditional Expression 2-7, AR refers to an aspect ratio of the object-side surface of the first lens L1. AR refers to a ratio of a length of the minor axis (b) of the first lens L1to a length of the major axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary line of the second lens L2to the fifth lens L5, and an aspect ratio of the object-side surface of the second lens L2to the fifth lens L5refer to the same characteristics as previously described with regard to the first lens L1

The first lens L1satisfies at least one of the following Conditional Expressions 2-8 to 2-10.
1.013 mm<ZS′1<1.322   mm[Conditional Expression 2-8]
86.0 degrees<α′1<115.8 degrees   [Conditional Expression 2-9]
0.531<AR′1<0.731   [Conditional Expression 2-10]

In Conditional Expression 2-8, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

In Conditional Expression 2-9, α′1 refers to an angle between a first imaginary line (P1′) connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion10of the first lens L1and a second imaginary line (P2′) connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion10of the first lens L1.

In Conditional Expression 2-10, AR′1 refers to an aspect ratio of the optical portion10in the object-side surface of the first lens L1. AR′1 refers to a ratio of a length of the minor axis (d) of the optical portion10of the first lens L1to a length of the major axis (c) of the optical portion10of the first lens L1.

The second lens L2satisfies at least one of the following Conditional Expressions 2-11 to 2-13.
1.032 mm<ZS′2<1.284 mm   [Conditional Expression 2-11]
71.7 degrees<α′2<104.7   degrees [Conditional Expression 2-12]
0.611<AR′2<0.811   [Conditional Expression 2-13]

In Conditional Expression 2-11, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

In Conditional Expression 2-12, α′2 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the second lens L2and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the second lens L2.

In Conditional Expression 2-13, AR′2 refers to an aspect ratio of the optical portion in the object-side surface of the second lens L2. AR′2 refers to a ratio of a length of the minor axis of the optical portion of the second lens L2to a length of the major axis of the optical portion of the second lens L2.

The third lens L3satisfies at least one of the following Conditional Expressions 2-14 to 2-16.
0.926 mm<ZS′3<1.011 mm   [Conditional Expression 2-14]
0 degree<α′3<68.5 degrees   [Conditional Expression 2-15]
0.827<AR′3<1.000   [Conditional Expression 2-16]

In Conditional Expression 2-14, ZS′3 refers to a ratio (A′3/l3) of an area (A′3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A′3) of the object-side surface of the third lens L3refers to an area of an optical portion in the object-side surface of the third lens L3.

In Conditional Expression 2-15, α′3 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the third lens L3and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the third lens L3.

In Conditional Expression 2-16, AR′3 refers to an aspect ratio of the optical portion in the object-side surface of the third lens L3. AR′3 refers to a ratio of a length of the minor axis of the optical portion of the third lens L3to a length of the major axis of the optical portion of the third lens L3.

The fourth lens L4satisfies at least one of the following Conditional Expressions 2-17 to 2-19.
0.950 mm<ZS′4<1.016 mm   [Conditional Expression 2-17]
0 degree<α′4<62.5 degrees   [Conditional Expression 2-18]
0.855<AR′4<1.000   [Conditional Expression 2-19]

In Conditional Expression 2-17, ZS′4 refers to a ratio (A′4/l4) of an area (A′4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A′4) of the object-side surface of the fourth lens L4refers to an area of an optical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 2-18, α′4 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fourth lens L4and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fourth lens L4.

In Conditional Expression 2-19, AR′4 refers to an aspect ratio of the optical portion in the object-side surface of the fourth lens L4. AR′4 refers to a ratio of a length of the minor axis of the optical portion of the fourth lens L4to a length of the major axis of the optical portion of the fourth lens L4.

The fifth lens L5satisfies at least one of the following Conditional Expressions 2-20 to 2-22.
1.095 mm<ZS′5<1.166 mm   [Conditional Expression 2-20]
0 degree<α′5<61.1 degrees   [Conditional Expression 2-21]
0.861<AR′5<1.000   [Conditional Expression 2-22]

In Conditional Expression 2-20, ZS′S refers to a ratio (A′5/l5) of an area (A′5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A′5) of the object-side surface of the fifth lens L5refers to an area of an optical portion in the object-side surface of the fifth lens L5.

In Conditional Expression 2-21, α′5 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fifth lens L5and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fifth lens L5.

In Conditional Expression 2-22, AR′5 refers to an aspect ratio of the optical portion in the object-side surface of the fifth lens L5. AR′5 refers to a ratio of a length of the minor axis of the optical portion of the fifth lens L5to a length of the major axis of the optical portion of the fifth lens L5.

The following Table 2 illustrates an embodiment of a lens assembly2satisfying the above Conditional Expressions 2-1 to 2-22.

The first lens L1and the second lens L2are configured to be aligned with respect to each other. For example, the first lens L1and the second lens L2are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1and a flange portion of an object-side surface of the second lens L2have a concavo-convex structure, respectively, and the concavo-convex structure of the first lens L1and the concavo-convex structure of the second lens L2are configured to be coupled to each other such that the optical axis is aligned.

As a third embodiment of a lens assembly2, a case in which all of a plurality of lenses are non-circular will be described. The plurality of lenses include a first lens L1to a seventh lens L7. In the third embodiment of the lens assembly2, the lens assembly2has a variable focal length. In this case, the lens assembly2of the third embodiment may change a focal length of the lens assembly2by moving at least a portion of the lenses to change a distance between the lenses.

Also, the lens assembly2has an FNO between 3.0 and 4.0. FNO refers to a constant indicating brightness of a lens assembly2.

The first lens L1satisfies the following Conditional Expression 3-1, the second lens L2satisfies the following Conditional Expression 3-2, the third lens L3satisfies the following Conditional Expression 3-3, the fourth lens L4satisfies the following Conditional Expression 3-4, the fifth lens L5satisfies the following Conditional Expression 3-5, the sixth lens L6satisfies the following Conditional Expression 3-6, and the seventh lens L7satisfies the following Conditional Expression 3-7.
1.106 mm<ZS1<1.828 mm   [Conditional Expression 3-1]
1.194 mm<ZS2<1.975 mm   [Conditional Expression 3-2]
1.385 mm<ZS3<2.289 mm   [Conditional Expression 3-3]
1.559 mm<ZS4<2.576 mm   [Conditional Expression 3-4]
1.765 mm<ZS5<2.919 mm   [Conditional Expression 3-5]
2.754 mm<ZS6<4.552 mm   [Conditional Expression 3-6]
3.361 mm<ZS7<5.556 mm   [Conditional Expression 3-7]

In Conditional Expression 3-1, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 3-2, ZS2 refers to a ratio (A2/L2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 3-3, ZS3 refers to a ratio (A3/l3) of an area (A3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A3) of the object-side surface of the third lens L3refers to the total area of the object-side surface of the third lens L3(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 3-4, ZS4 refers to a ratio (A4/l4) of an area (A4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of the object-side surface of the fourth lens L4refers to the total area of the object-side surface of the fourth lens L4(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 3-5, ZS5 refers to a ratio (A5/l5) of an area (A5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A5) of the object-side surface of the fifth lens L5refers to the total area of the object-side surface of the fifth lens L5(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 3-6, ZS6 refers to a ratio (A6/l6) of an area (A6) of an object-side surface of the sixth lens L6to a distance (l6) of the optical axis from the object-side surface of the sixth lens L6to an imaging plane of an image sensor S. The area (A6) of the object-side surface of the sixth lens L6refers to the total area of the object-side surface of the sixth lens L6(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 3-7, ZS7 refers to a ratio (A7/l7) of an area (A7) of an object-side surface of the seventh lens L7to a distance (l7) of the optical axis from the object-side surface of the seventh lens L7to an imaging plane of an image sensor S. The area (A7) of the object-side surface of the seventh lens L7refers to the total area of the object-side surface of the seventh lens L7(the sum of an area of an optical portion and an area of a flange portion).

In the third embodiment, the first lens L1to the seventh lens L7satisfy at least one of the following Conditional Expressions 3-8 and 3-9.
79.4 degrees<α<126.4 degrees   [Conditional Expression 3-8]
0.451<AR<0.769   [Conditional Expression 3-9]

In Conditional Expression 3-8, a refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1.

In Conditional Expression 3-9, AR refers to an aspect ratio of the object-side surface of the first lens L1. AR refers to a ratio of a length of the minor axis (b) of the first lens L1to a length of the major axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary line of the second lens L2to the seventh lens L7, and an aspect ratio of the object-side surface of the second lens L2to the seventh lens L7refer to the same characteristics as previously described with regard to the first lens L1.

The first lens L1satisfies at least one of the following Conditional Expressions 3-10 to 3-12.
0.616 mm<ZS′1<1.066 mm   [Conditional Expression 3-10]
0 degree<α′1<106.7 degrees   [Conditional Expression 3-11]
0.597<AR′1<1.0   [Conditional Expression 3-11]

In Conditional Expression 3-10, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

In Conditional Expression 3-11, α′1 refers to an angle between a first imaginary line (P1′) connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion10of the first lens L1and a second imaginary line (P2′) connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion10of the first lens L1.

In Conditional Expression 3-12, AR′1 refers to an aspect ratio of the optical portion10in the object-side surface of the first lens L1. AR′1 refers to a ratio of a length of the minor axis (d) of the optical portion10of the first lens L1to a length of the major axis (c) of the optical portion10of the first lens L1.

The second lens L2satisfies at least one of the following Conditional Expressions 3-13 to 3-15.
0.616 mm<ZS′2<1.061 mm   [Conditional Expression 3-13]
0 degree<α′2<100.7 degrees   [Conditional Expression 3-14]
0.638<AR′2<1.0   [Conditional Expression 3-15]

In Conditional Expression 3-13, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

In Conditional Expression 3-14, α′2 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the second lens L2and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the second lens L2.

In Conditional Expression 3-15, AR′2 refers to an aspect ratio of the optical portion in the object-side surface of the second lens L2. AR′2 refers to a ratio of a length of the minor axis of the optical portion of the second lens L2to a length of the major axis of the optical portion of the second lens L2.

The third lens L3satisfies at least one of the following Conditional Expressions 3-16 to 3-18.
0.796 mm<ZS′3<1.383 mm   [Conditional Expression 3-16]
0 degree<α′3<109.3 degrees   [Conditional Expression 3-17]
0.579<AR′3<1.000   [Conditional Expression 3-18]

In Conditional Expression 3-16, ZS′3 refers to a ratio (A′3/l3) of an area (A′3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A′3) of the object-side surface of the third lens L3refers to an area of an optical portion in the object-side surface of the third lens L3.

In Conditional Expression 3-17, α′3 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the third lens L3and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the third lens L3.

In Conditional Expression 3-18, AR′3 refers to an aspect ratio of the optical portion in the object-side surface of the third lens L3. AR′3 refers to a ratio of a length of the minor axis of the optical portion of the third lens L3to a length of the major axis of the optical portion of the third lens L3.

The fourth lens L4satisfies at least one of the following Conditional Expressions 3-19 to 3-21.
0.782 mm<ZS′4<1.346 mm   [Conditional Expression 3-19]
0 degree<α′4<98.6 degrees   [Conditional Expression 3-20]
0.652<AR′4<1.000   [Conditional Expression 3-21]

In Conditional Expression 3-19, ZS′4 refers to a ratio (A′4/l4) of an area (A′4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A′4) of the object-side surface of the fourth lens L4refers to an area of an optical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 3-20, α′4 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fourth lens L4and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fourth lens L4.

In Conditional Expression 3-21, AR′4 refers to an aspect ratio of the optical portion in the object-side surface of the fourth lens L4. AR′4 refers to a ratio of a length of the minor axis of the optical portion of the fourth lens L4to a length of the major axis of the optical portion of the fourth lens L4.

The fifth lens L5satisfies at least one of the following Conditional Expressions 3-22 to 3-24.
0.844 mm<ZS′5<1.451 mm   [Conditional Expression 3-22]
0 degree<α′5<94.7 degrees   [Conditional Expression 3-23]
0.678<AR′5<1.000   [Conditional Expression 3-24]

In Conditional Expression 3-22, ZS′S refers to a ratio (A′5/l5) of an area (A′5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A′5) of the object-side surface of the fifth lens L5refers to an area of an optical portion in the object-side surface of the fifth lens L5.

In Conditional Expression 3-23, α′5 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fifth lens L5and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fifth lens L5.

In Conditional Expression 3-24, AR′5 refers to an aspect ratio of the optical portion in the object-side surface of the fifth lens L5. AR′5 refers to a ratio of a length of the minor axis of the optical portion of the fifth lens L5to a length of the major axis of the optical portion of the fifth lens L5.

The sixth lens L6satisfies at least one of the following Conditional Expressions 3-25 to 3-27.
1.438 mm<ZS′6<2.477 mm   [Conditional Expression 3-25]
0 degree<α′6<101.7 degrees   [Conditional Expression 3-26]
0.631<AR′6<1.0   [Conditional Expression 3-27]

In Conditional Expression 3-25, ZS′6 refers to a ratio (A′6/l6) of an area (A′6) of an object-side surface of the sixth lens L6to a distance (l6) of the optical axis from the object-side surface of the sixth lens L6to an imaging plane of an image sensor S. The area (A′6) of the object-side surface of the sixth lens L6refers to an area of an optical portion in the object-side surface of the sixth lens L6.

In Conditional Expression 3-26, α′6 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the sixth lens L6and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the sixth lens L6.

In Conditional Expression 3-27, AR′6 refers to an aspect ratio of the optical portion in the object-side surface of the sixth lens L6. AR′6 refers to a ratio of a length of the minor axis of the optical portion of the sixth lens L6to a length of the major axis of the optical portion of the sixth lens L6.

The seventh lens L7satisfies at least one of the following Conditional Expressions 3-28 to 3-30.
1.915 mm<ZS′7<3.323 mm   [Conditional Expression 3-28]
0 degree<α′7<108.5 degrees   [Conditional Expression 3-29]
0.584<AR′7<1.0   [Conditional Expression 3-30]

In Conditional Expression 3-28, ZS′7 refers to a ratio (A′7/l7) of an area (A′7) of an object-side surface of the seventh lens L7to a distance (l7) of the optical axis from the object-side surface of the seventh lens L7to an imaging plane of an image sensor S. The area (A′7) of the object-side surface of the seventh lens L7refers to an area of an optical portion in the object-side surface of the seventh lens L7.

In Conditional Expression 3-29, α′7 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the seventh lens L7and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the seventh lens L7.

In Conditional Expression 3-30, AR′7 refers to an aspect ratio of the optical portion in the object-side surface of the seventh lens L7. AR′7 refers to a ratio of a length of the minor axis of the optical portion of the seventh lens L7to a length of the major axis of the optical portion of the seventh lens L7.

The following Table 3 illustrates an embodiment of the lens assembly2satisfying the above Conditional Expressions 3-1 to 3-30. In an embodiment of the present disclosure, the lens assembly2has an FNO of 3.5.

In a fourth embodiment of a lens assembly2, a first lens L1to a third lens L3among a plurality of lenses are non-circular, the other lenses are circular, and a length of a relative long side of the image sensor S is 1.5 times or more a length of a relative short side of the image sensor S. For example, a ratio of the length of the relative long side to the relative short side of the image sensor S is 16:9, 18:9, or 19:9.

The plurality of lenses include a first lens L1to a fifth lens L5, and the lens assembly2, in the fourth embodiment of the lens assembly2, has a fixed focal length.

Further, the lens assembly2has an FNO of 4.0. FNO refers to a constant indicating brightness of a lens assembly2.

Referring toFIG. 8, an image sensor S has a rectangular shape, and a length of a relative long side of the image sensor S, in the fourth to sixth embodiments of the lens assembly2, is 1.5 times or more a length of a relative short side of the lens assembly2.

The image sensor S includes an effective imaging area EA, and the number of pixels of the effective imaging area EA in a traverse direction (corresponding to the relative long side of the image sensor S) is 1.5 times or more the number of pixels in a longitudinal direction (corresponding to the relative short side of the image sensor S). For example, a ratio of the number of pixels of the effective imaging area EA in a traverse direction to the number of pixels of the effective imaging area EA in a longitudinal direction is 16:9, 18:9, or 19:9.

The image sensor S may be connected to a substrate by a wire bonding process. For this purpose, a bonding pad B may be provided in the image sensor S.

The bonding pad B may be formed at a position adjacent to both sides of the relative short side of the image sensor S.

The first lens L1satisfies the following Conditional Expression 4-1, the second lens L2satisfies the following Conditional Expression 4-2, and the third lens L3satisfies the following Conditional Expression 4-3.
1.1 mm<ZS1<1.438 mm   [Conditional Expression 4-1]
1.258 mm<ZS2<1.644 mm   [Conditional Expression 4-2]
1.522 mm<ZS3<1.989 mm   [Conditional Expression 4-3]

In Conditional Expression 4-1, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 4-2, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 4-3, ZS3 refers to a ratio (A3/l3) of an area (A3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A3) of the object-side surface of the third lens L3refers to the total area of the object-side surface of the third lens L3(the sum of an area of an optical portion and an area of a flange portion).

In the fourth embodiment, the first lens L1to the third lens L3satisfy at least one of the following Conditional Expressions 4-4 and 4-5.
86.2 degrees<α<116.0 degrees   [Conditional Expression 4-4]
0.53<AR<0.73   [Conditional Expression 4-5]

In Conditional Expression 4-4, a refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1.

In Conditional Expression 4-5, AR refers to an aspect ratio of the object-side surface of the first lens L1. AR refers to a ratio of a length of the minor axis (b) of the first lens L1to a length of the major axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary line of the second lens L2and the third lens L3, and an aspect ratio of the object-side surface of the second lens L2and the third lens L3refer to the same characteristics as previously described with regard to the first lens L1.

The first lens L1satisfies at least one of the following Conditional Expressions 4-6 to 4-8.
0.855 mm<ZS′1<1.089 mm   [Conditional Expression 4-6]
79.1 degrees<α′1<110.3 degrees   [Conditional Expression 4-7]
0.571<AR′1<0.771   [Conditional Expression 4-8]

In Conditional Expression 4-6, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

In Conditional Expression 4-7, α′1 refers to an angle between a first imaginary line (P1′) connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion10of the first lens L1and a second imaginary line (P2′) connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion10of the first lens L1.

In Conditional Expression 4-8, AR′1 refers to an aspect ratio of the optical portion10in the object-side surface of the first lens L1. AR′1 refers to a ratio of a length of the minor axis (d) of the optical portion10of the first lens L1to a length of the major axis (c) of the optical portion10of the first lens L1.

The second lens L2satisfies at least one of the following Conditional Expressions 4-9 to 4-11.
0.866 mm<ZS′2<1.052 mm   [Conditional Expression 4-9]
62.4 degrees<α′2<98.1 degrees   [Conditional Expression 4-10]
0.655<AR′2<0.855   [Conditional Expression 4-11]

In Conditional Expression 4-9, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

In Conditional Expression 4-10, α′2 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the second lens L2and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the second lens L2.

In Conditional Expression 4-11, AR′2 refers to an aspect ratio of the optical portion in the object-side surface of the second lens L2. AR′2 refers to a ratio of a length of the minor axis of the optical portion of the second lens L2to a length of the major axis of the optical portion of the second lens L2.

The third lens L3satisfies at least one of the following Conditional Expressions 4-12 to 4-14.
0.764 mm<ZS′3<0.801 mm   [Conditional Expression 4-12]
0 degree<α′3<55.5 degrees   [Conditional Expression 4-13]
0.885<AR′3<1.000   [Conditional Expression 4-14]

In Conditional Expression 4-12, ZS′3 refers to a ratio (A′3/l3) of an area (A′3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A′3) of the object-side surface of the third lens L3refers to an area of an optical portion in the object-side surface of the third lens L3.

In Conditional Expression 4-13, α′3 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the third lens L3and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the third lens L3.

In Conditional Expression 4-14, AR′3 refers to an aspect ratio of the optical portion in the object-side surface of the third lens L3. AR′3 refers to a ratio of a length of the minor axis of the optical portion of the third lens L3to a length of the major axis of the optical portion of the third lens L3.

The following Table 4 illustrates embodiments of the lens assembly2satisfying the above Conditional Expressions 4-1 to 4-14.

The first lens L1and the second lens L2are configured to be aligned with respect to each other. For example, the first lens L1and the second lens L2are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1and a flange portion of an object-side surface of the second lens L2have a concavo-convex structure, respectively, and the concavo-convex structure of the first lens L1and the concavo-convex structure of the second lens L2are configured to be coupled to each other such that the optical axis is aligned.

Further, the second lens L2and the third lens L3are configured to be aligned with respect to each other. For example, the second lens L2and the third lens L3are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the second lens L2and a flange portion of an object-side surface of the third lens L3have a concavo-convex structure, respectively, and the concavo-convex structure of the second lens L2and the concavo-convex structure of the third lens L3are configured to be coupled to each other such that the optical axis is aligned.

As a fifth embodiment of a lens assembly2, a case in which all of a plurality of lenses are non-circular, and a length of a relative long side of the image sensor S is 1.5 times or more a length of a relative short side of the image sensor S will be described. For example, a ratio of the length of the relative long side to the relative short side of the image sensor S is 16:9, 18:9, or 19:9. The plurality of lenses include a first lens L1to a fifth lens L5, and the lens assembly2, in the fifth embodiment of the lens assembly2, has a fixed focal length.

Further, the lens assembly2has an FNO of 4.0. FNO refers to a constant indicating brightness of a lens assembly2.

The first lens L1satisfies the following Conditional Expression 5-1, the second lens L2satisfies the following Conditional Expression 5-2, the third lens L3satisfies the following Conditional Expression 5-3, the fourth lens L4satisfies the following Conditional Expression 5-4, and the fifth lens L5satisfies the following Conditional Expression 5-5.
0.916 mm<ZS1<1.284 mm   [Conditional Expression 5-1]
1.048 mm<ZS2<1.468 mm   [Conditional Expression 5-2]
1.267 mm<ZS3<1.776 mm   [Conditional Expression 5-3]
1.352 mm<ZS4<1.895 mm   [Conditional Expression 5-4]
1.572 mm<ZS5<2.203 mm   [Conditional Expression 5-5]

In Conditional Expression 5-1, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 5-2, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 5-3, ZS3 refers to a ratio (A3/l3) of an area (A3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A3) of the object-side surface of the third lens L3refers to the total area of the object-side surface of the third lens L3(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 5-4, ZS4 refers to a ratio (A4/l4) of an area (A4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of the object-side surface of the fourth lens L4refers to the total area of the object-side surface of the fourth lens L4(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 5-5, ZS5 refers to a ratio (A5/l5) of an area (A5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A5) of the object-side surface of the fifth lens L5refers to the total area of the object-side surface of the fifth lens L5(the sum of an area of an optical portion and an area of a flange portion).

In the fifth embodiment, the first lens L1to the fifth lens L5satisfy at least one of the following Conditional Expressions 5-6 and 5-7.
101.3 degrees<α<128.6 degrees   [Conditional Expression 5-6]
0.434<AR<0.634   [Conditional Expression 5-7]

In Conditional Expression 5-6, a refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1.

In Conditional Expression 5-7, AR refers to an aspect ratio of the object-side surface of the first lens L1. AR refers to a ratio of a length of the minor axis (b) of the first lens L1to a length of the major axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary line of the second lens L2to the fifth lens L5, and an aspect ratio of the object-side surface of the second lens L2to the fifth lens L5refer to the same characteristics as previously described with regard to the first lens L1.

The first lens L1satisfies at least one of the following Conditional Expressions 5-8 to 5-10.
0.701 mm<ZS′1<0.963 mm   [Conditional Expression 5-8]
97.7 degrees<α′1<125.5 degrees   [Conditional Expression 5-9]
0.458<AR′1<0.658   [Conditional Expression 5-10]

In Conditional Expression 5-8, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

In Conditional Expression 5-9, α′1 refers to an angle between a first imaginary line (P1′) connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion10of the first lens L1and a second imaginary line (P2′) connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion10of the first lens L1.

In Conditional Expression 5-10, AR′1 refers to an aspect ratio of the optical portion10in the object-side surface of the first lens L1. AR′1 refers to a ratio of a length of the minor axis (d) of the optical portion10of the first lens L1to a length of the major axis (c) of the optical portion10of the first lens L1.

The second lens L2satisfies at least one of the following Conditional Expressions 5-11 to 5-13.
0.720 mm<ZS′2<0.942 mm   [Conditional Expression 5-11]
86.5 degrees<α′2<116.2 degrees   [Conditional Expression 5-12]
0.528<AR′2<0.728   [Conditional Expression 5-13]

In Conditional Expression 5-11, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

In Conditional Expression 5-12, α′2 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the second lens L2and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the second lens L2.

In Conditional Expression 5-13, AR′2 refers to an aspect ratio of the optical portion in the object-side surface of the second lens L2. AR′2 refers to a ratio of a length of the minor axis of the optical portion of the second lens L2to a length of the major axis of the optical portion of the second lens L2.

The third lens L3satisfies at least one of the following Conditional Expressions 5-14 to 5-16.
0.664 mm<ZS′3<0.779 mm   [Conditional Expression 5-14]
46.4 degrees<α′3<88.0 degrees   [Conditional Expression 5-15]
0.719<AR′3<0.919   [Conditional Expression 5-16]

In Conditional Expression 5-14, ZS′3 refers to a ratio (A′3/l3) of an area (A′3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A′3) of the object-side surface of the third lens L3refers to an area of an optical portion in the object-side surface of the third lens L3.

In Conditional Expression 5-15, α′3 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the third lens L3and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the third lens L3.

In Conditional Expression 5-16, AR′3 refers to an aspect ratio of the optical portion in the object-side surface of the third lens L3. AR′3 refers to a ratio of a length of the minor axis of the optical portion of the third lens L3to a length of the major axis of the optical portion of the third lens L3.

The fourth lens L4satisfies at least one of the following Conditional Expressions 5-17 to 5-19.
0.685 mm<ZS′4<0.792 mm   [Conditional Expression 5-17]
38.5 degrees<α′4<83.8 degrees   [Conditional Expression 5-18]
0.744<AR′4<0.944   [Conditional Expression 5-19]

In Conditional Expression 5-17, ZS′4 refers to a ratio (A′4/l4) of an area (A′4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A′4) of the object-side surface of the fourth lens L4refers to an area of an optical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 5-18, α′4 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fourth lens L4and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fourth lens L4.

In Conditional Expression 5-19, AR′4 refers to an aspect ratio of the optical portion in the object-side surface of the fourth lens L4. AR′4 refers to a ratio of a length of the minor axis of the optical portion of the fourth lens L4to a length of the major axis of the optical portion of the fourth lens L4.

The fifth lens L5satisfies at least one of the following Conditional Expressions 5-20 to 5-22.
0.790 mm<ZS′5<0.911 mm   [Conditional Expression 5-20]
36.5 degrees<α′5<82.9 degrees   [Conditional Expression 5-21]
0.750<AR′5<0.950   [Conditional Expression 5-22]

In Conditional Expression 5-20, ZS′5 refers to a ratio (A′5/l5) of an area (A′5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A′5) of the object-side surface of the fifth lens L5refers to an area of an optical portion in the object-side surface of the fifth lens L5.

In Conditional Expression 5-21, α′5 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fifth lens L5and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fifth lens L5.

In Conditional Expression 5-22, AR′5 refers to an aspect ratio of the optical portion in the object-side surface of the fifth lens L5. AR′5 refers to a ratio of a length of the minor axis of the optical portion of the fifth lens L5to a length of the major axis of the optical portion of the fifth lens L5.

The following Table5illustrates an embodiment of the lens assembly2satisfying the above Conditional Expressions 5-1 to 5-22.

The first lens L1and the second lens L2are configured to be aligned with respect to each other. For example, the first lens L1and the second lens L2are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1and a flange portion of an object-side surface of the second lens L2have a concavo-convex structure, respectively, and the concavo-convex structure of the first lens L1and the concavo-convex structure of the second lens L2are configured to be coupled to each other such that the optical axis is aligned.

As a sixth embodiment of a lens assembly2, a case in which all of a plurality of lenses are non-circular, and a length of a relative long side of the image sensor S is 1.5 times or more a length of a relative short side of the image sensor S will be described. For example, a ratio of the length of the relative long side to the relative short side of the image sensor S is 16:9, 18:9, or 19:9. The plurality of lenses include a first lens L1to a seventh lens L7, and the lens assembly2, in the sixth embodiment of the lens assembly2, has a variable focal length. In this case, the lens assembly2of the sixth embodiment may change a focal length of the lens assembly2by moving at least a portion of the lenses to change a distance between the lenses.

Further, the lens assembly2has an FNO of 4.0. FNO refers to a constant indicating brightness of a lens assembly2.

The first lens L1satisfies the following Conditional Expression 6-1, the second lens L2satisfies the following Conditional Expression 6-2, the third lens L3satisfies the following Conditional Expression 6-3, the fourth lens L4satisfies the following Conditional Expression 6-4, the fifth lens L5satisfies the following Conditional Expression 6-5, the sixth lens L6satisfies the following Conditional Expression 6-6, and the seventh lens L7satisfies the following Conditional Expression 6-7.
0.920 mm<ZS1<1.355 mm   [Conditional Expression 6-1]
0.994 mm<ZS2<1.464 mm   [Conditional Expression 6-2]
1.152 mm<ZS3<1.697 mm   [Conditional Expression 6-3]
1.296 mm<ZS4<1.910 mm   [Conditional Expression 6-4]
1.469 mm<ZS5<2.163 mm   [Conditional Expression 6-5]
2.291 mm<ZS6<3.374 mm   [Conditional Expression 6-6]
2.796 mm<ZS7<4.118 mm   [Conditional Expression 6-7]

In Conditional Expression 6-1, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 6-2, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 6-3, ZS3 refers to a ratio (A3/l3) of an area (A3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A3) of the object-side surface of the third lens L3refers to the total area of the object-side surface of the third lens L3(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 6-4, ZS4 refers to a ratio (A4/l4) of an area (A4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of the object-side surface of the fourth lens L4refers to the total area of the object-side surface of the fourth lens L4(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 6-5, ZS5 refers to a ratio (A5/l5) of an area (A5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A5) of the object-side surface of the fifth lens L5refers to the total area of the object-side surface of the fifth lens L5(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 6-6, ZS6 refers to a ratio (A6/l6) of an area (A6) of an object-side surface of the sixth lens L6to a distance (l6) of the optical axis from the object-side surface of the sixth lens L6to an imaging plane of an image sensor S. The area (A6) of the object-side surface of the sixth lens L6refers to the total area of the object-side surface of the sixth lens L6(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 6-7, ZS7 refers to a ratio (A7/l7) of an area (A7) of an object-side surface of the seventh lens L7to a distance (l7) of the optical axis from the object-side surface of the seventh lens L7to an imaging plane of an image sensor S. The area (A7) of the object-side surface of the seventh lens L7refers to the total area of the object-side surface of the seventh lens L7(the sum of an area of an optical portion and an area of a flange portion).

In the sixth embodiment, the first lens L1to the seventh lens L7satisfies at least one of the following Conditional Expressions 6-8 and 6-9.
109.2 degrees<α<135.4 degrees   [Conditional Expression 6-8]
0.379<AR<0.579   [Conditional Expression 6-9]

In Conditional Expression 6-8, a refers to an angle between the first imaginary line (P1) and the second imaginary line (P2) of the first lens L1.

In Conditional Expression 6-9, AR refers to an aspect ratio of the object-side surface of the first lens L1. AR refers to a ratio of a length of the minor axis (b) of the first lens L1to a length of the major axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary line of the second lens L2to the seventh lens L7, and an aspect ratio of the object-side surface of the second lens L2to the seventh lens L7refer to the same characteristics as previously described with regard to the first lens L1.

The first lens L1satisfies at least one of the following Conditional Expressions 6-10 to 6-12.
0.630 mm<ZS′1<0.855 mm   [Conditional Expression 6-10]
95.1 degrees<α′1<123.3 degrees   [Conditional Expression 6-11]
0.475<AR′1<0.675   [Conditional Expression 6-11]

In Conditional Expression 6-10, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

In Conditional Expression 6-11, α′1 refers to an angle between a first imaginary line (P1′) connecting an optical axis and a connection point between a first edge11and a fourth edge14of the optical portion10of the first lens L1and a second imaginary line (P2′) connecting an optical axis and a connection point between a second edge12and a fourth edge14of the optical portion10of the first lens L1.

In Conditional Expression 6-12, AR′1 refers to an aspect ratio of the optical portion10in the object-side surface of the first lens L1. AR′1 refers to a ratio of a length of the minor axis (d) of the optical portion10of the first lens L1to a length of the major axis (c) of the optical portion10of the first lens L1.

The second lens L2satisfies at least one of the following Conditional Expressions 6-13 to 6-15.
0.646 mm<ZS′2<0.856 mm   [Conditional Expression 6-13]
89.7 degrees<α′2<118.8 degrees   [Conditional Expression 6-14]
0.509<AR′2<0.709   [Conditional Expression 6-15]

In Conditional Expression 6-13, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

In Conditional Expression 6-14, α′2 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the second lens L2and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the second lens L2.

In Conditional Expression 6-15, AR′2 refers to an aspect ratio of the optical portion in the object-side surface of the second lens L2. AR′2 refers to a ratio of a length of the minor axis of the optical portion of the second lens L2to a length of the major axis of the optical portion of the second lens L2.

The third lens L3satisfies at least one of the following Conditional Expressions 6-16 to 6-18.
0.807 mm<ZS′3<1.108 mm   [Conditional Expression 6-16]
97.4 degrees<α′3<125.2 degrees   [Conditional Expression 6-17]
0.460<AR′3<0.660   [Conditional Expression 6-18]

In Conditional Expression 6-16, ZS′3 refers to a ratio (A′3/l3) of an area (A′3) of an object-side surface of the third lens L3to a distance (l3) of the optical axis from the object-side surface of the third lens L3to an imaging plane of an image sensor S. The area (A′3) of the object-side surface of the third lens L3refers to an area of an optical portion in the object-side surface of the third lens L3.

In Conditional Expression 6-17, α′3 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the third lens L3and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the third lens L3.

In Conditional Expression 6-18, AR′3 refers to an aspect ratio of the optical portion in the object-side surface of the third lens L3. AR′3 refers to a ratio of a length of the minor axis of the optical portion of the third lens L3to a length of the major axis of the optical portion of the third lens L3.

The fourth lens L4satisfies at least one of the following Conditional Expressions 6-19 to 6-21.
0.828 mm<ZS′4<1.089 mm   [Conditional Expression 6-19]
87.8 degrees<α′4<117.3 degrees   [Conditional Expression 6-20]
0.521<AR′4<0.721   [Conditional Expression 6-21]

In Conditional Expression 6-19, ZS′4 refers to a ratio (A′4/l4) of an area (A′4) of an object-side surface of the fourth lens L4to a distance (l4) of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A′4) of the object-side surface of the fourth lens L4refers to an area of an optical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 6-20, α′4 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fourth lens L4and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fourth lens L4.

In Conditional Expression 6-21, AR′4 refers to an aspect ratio of the optical portion in the object-side surface of the fourth lens L4. AR′4 refers to a ratio of a length of the minor axis of the optical portion of the fourth lens L4to a length of the major axis of the optical portion of the fourth lens L4.

The fifth lens L5satisfies at least one of the following Conditional Expressions 6-22 to 6-24.
0.909 mm<ZS′5<1.179 mm   [Conditional Expression 6-22]
84.3 degrees<α′5<114.4 degrees   [Conditional Expression 6-23]
0.542<AR′5<0.742   [Conditional Expression 6-24]

In Conditional Expression 6-22, ZS′5 refers to a ratio (A′5/l5) of an area (A′5) of an object-side surface of the fifth lens L5to a distance (l5) of the optical axis from the object-side surface of the fifth lens L5to an imaging plane of an image sensor S. The area (A′5) of the object-side surface of the fifth lens L5refers to an area of an optical portion in the object-side surface of the fifth lens L5.

In Conditional Expression 6-23, α′5 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the fifth lens L5and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the fifth lens L5.

In Conditional Expression 6-24, AR′5 refers to an aspect ratio of the optical portion in the object-side surface of the fifth lens L5. AR′5 refers to a ratio of a length of the minor axis of the optical portion of the fifth lens L5to a length of the major axis of the optical portion of the fifth lens L5.

The sixth lens L6satisfies at least one of the following Conditional Expressions 6-25 to 6-27.
1.502 mm<ZS′6<1.997 mm   [Conditional Expression 6-25]
90.6 degrees<α′6<119.5 degrees   [Conditional Expression 6-26]
0.503<AR′6<0.703   [Conditional Expression 6-27]

In Conditional Expression 6-25, ZS′6 refers to a ratio (A′6/l6) of an area (A′6) of an object-side surface of the sixth lens L6to a distance (l6) of the optical axis from the object-side surface of the sixth lens L6to an imaging plane of an image sensor S. The area (A′6) of the object-side surface of the sixth lens L6refers to an area of an optical portion in the object-side surface of the sixth lens L6.

In Conditional Expression 6-26, α′6 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the sixth lens L6and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the sixth lens L6.

In Conditional Expression 6-27, AR′6 refers to an aspect ratio of the optical portion in the object-side surface of the sixth lens L6. AR′6 refers to a ratio of a length of the minor axis of the optical portion of the sixth lens L6to a length of the major axis of the optical portion of the sixth lens L6.

The seventh lens L7satisfies at least one of the following Conditional Expressions 6-28 to 6-30.
1.946 mm<ZS′7<2.662 mm   [Conditional Expression 6-28]
96.7 degrees<α′7<124.7 degrees   [Conditional Expression 6-29]
0.464<AR′7<0.664   [Conditional Expression 6-30]

In Conditional Expression 6-28, ZS′7 refers to a ratio (A′7/l7) of an area (A′7) of an object-side surface of the seventh lens L7to a distance (l7) of the optical axis from the object-side surface of the seventh lens L7to an imaging plane of an image sensor S. The area (A′7) of the object-side surface of the seventh lens L7refers to an area of an optical portion in the object-side surface of the seventh lens L7.

In Conditional Expression 6-29, α′7 refers to an angle between a first imaginary line connecting an optical axis and a connection point between a first edge and a fourth edge of the optical portion of the seventh lens L7and a second imaginary line connecting an optical axis and a connection point between a second edge and a fourth edge of the optical portion of the seventh lens L7.

In Conditional Expression 6-30, AR′7 refers to an aspect ratio of the optical portion in the object-side surface of the seventh lens L7. AR′7 refers to a ratio of a length of the minor axis of the optical portion of the seventh lens L7to a length of the major axis of the optical portion of the seventh lens L7.

The following Table 6 illustrates an embodiment of the lens assembly2satisfying the above Conditional Expressions 6-1 to 6-30.

The first to sixth embodiments of the lens assembly2described above satisfy at least one of the following Conditional Expressions 7 and 8.
0.62398<ZS1/ZS2<1.36318   [Conditional Expression 7]
0.73598<ZS′1/ZS′2<1.37987   [Conditional Expression 8]

In Conditional Expression 7, ZS1 refers to a ratio (A1/l1) of an area (A1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A1) of the object-side surface of the first lens L1refers to the total area of the object-side surface of the first lens L1(the sum of an area of an optical portion and an area of a flange portion).

Further, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of the object-side surface of the second lens L2refers to the total area of the object-side surface of the second lens L2(the sum of an area of an optical portion and an area of a flange portion).

In Conditional Expression 8, ZS′1 refers to a ratio (A1/l1) of an area (A′1) of an object-side surface of the first lens L1to a distance (l1) of the optical axis from the object-side surface of the first lens L1to an imaging plane of an image sensor S. The area (A′1) of the object-side surface of the first lens L1refers to an area of the optical portion10in the object-side surface of the first lens L1.

Further, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of an object-side surface of the second lens L2to a distance (l2) of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A′2) of the object-side surface of the second lens L2refers to an area of the optical portion in the object-side surface of the second lens L2.

Next, an optical imaging system3including a first lens to a fifth lens will be described with reference toFIGS. 9 to 23.

In the configuration diagrams ofFIGS. 9 to 23, a thickness, a size, and a shape of a lens may be exaggerated for the sake of explanation. For example, a shape of a spherical or non-spherical surface of the lens illustrated in the configuration diagram may be illustrated as an example, and is not limited thereto.

In the lens, a first surface refers to a relatively closer surface to an object side (or an object-side surface), and a second surface refers to a relatively closer surface to an image side (or an image-side surface). In this specification, numerical values regarding radii of curvature of a lens, thickness of a lens, distance between lenses, effective aperture radius, and the like are expressed in millimeters (mm), and angles are expressed in degrees.

In addition, in explanation of the shape of the lens, a convex shape of one surface refers to a paraxial region of the surface being convex, and a concave shape of one surface refers to a paraxial region of the surface being concave. Therefore, even when one surface of a lens is described as a convex shape, an edge portion of the lens may be concave. Similarly, even when one surface of a lens is described as a concave shape, an edge portion of the lens may be convex.

The paraxial region refers to a relatively very narrow region adjacent to and including an optical axis.

All lenses constituting an optical imaging system3according to an embodiment of the present disclosure may be made of a plastic material.

At least a portion of a first lens L1to a fifth lens L5constituting the optical imaging system3may have a non-circular planar shape. For example, the first lens L1and the second lens L2may be formed in a non-circular shape, and the third lens L3to the fifth lens L5may be formed in a circular shape.

Effective radius of the non-circular lens may be formed larger than effective radius of the other lenses.

Effective aperture radius refers to radius of one surface (an object-side surface and an image-side surface) of a lens through which light actually passes. For example, the effective radius refers to radius of an optical portion of a lens.

Since the first lens L1may be non-circular, effective radius of the first lens L1may have the maximum effective radius (half of a relative long axis (c)) and the minimum effective radius (half of a relative short axis (d)). In this specification, effective radius of a non-circular lens refers to the maximum effective radius.

A plurality of lenses may have at least one non-spherical surface, respectively.

For example, at least one of a first surface and a second surface of the first lens L1to the fifth lens L5may be a non-spherical surface. Here, the non-spherical surface of the first lens L1to the fifth lens L5may be expressed by Equation 1.

In Equation 1, c is a curvature of a lens (an inverse of a radius of curvature of the lens), K is a conic constant, Y is a distance from a certain point on a non-spherical surface of the lens to an optical axis of the lens. Further, A to E are non-spherical constants. In addition, Z (or sag) is a distance from a certain point on the non-spherical surface of the lens to an apex of the non-spherical surface of the lens in an optical axis direction.

An optical imaging system comprised of a first lens L1to a fifth lens L5may have positive/negative/positive/negative/positive refractive power from an object side in sequence, or may have positive/negative/positive/positive/positive refractive powers from an object side in sequence.

In the Conditional Expressions, IMG HT refers to one-half of a diagonal length of the imaging plane of the image sensor, and TTL refers to a distance from the object-side surface of the first lens to an imaging plane of the image sensor.

f refers to the total focal length of the optical imaging system, and BFL refers to a distance along the optical axis from the image-side surface of the lens, disposed closest to the image sensor, to the imaging plane of the image sensor.

f12 refers to a combined focal length of the first lens and the second lens, and TD12 refers to a distance along the optical axis from the object-side surface of the first lens to the image-side surface of the second lens.

ER11 refers to effective radius of the object-side surface of the first lens, ER21 refers to effective radius of the object-side surface of the second lens, and ER51 refers to effective radius of the object-side surface of the lens, disposed closest to the image sensor.

ER_max refers to a maximum value among effective radius of the object-side surface and effective radius of the image-side surface of the lenses, except for the first lens and the second lens.

CRA_max refers to a maximum value of an incident angle on an imaging plane of a chief ray.

The optical imaging system3may improve aberration improving performance, because a plurality of lenses perform an aberration correcting function.

In addition, an optical imaging system3according to an embodiment of the present disclosure may have a telephoto ratio (TTL/f) of greater than 0.8 and smaller than 1.2, and thus may have a feature of a telephoto lens, and may realize a relative narrow angle of view.

An example of the first embodiment of the optical imaging system3will be described with reference toFIGS. 9 to 11.

The first embodiment of the optical imaging system3includes a first lens110, a second lens120, a third lens130, a fourth lens140, and a fifth lens150.

InFIG. 9, reference numeral160denotes an infrared light blocking filter, and reference numeral170denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thickness of a lens, distance between lenses, a refractive index, an Abbe number, an effective aperture radius, and the like) are illustrated in Table 7.

The total focal length of the optical imaging system3is 15.0027 mm.

In the first embodiment of the optical imaging system3, the first lens110has positive refractive power, and a first surface and a second surface of the first lens110are convex in the paraxial region.

A focal length of the first lens110is shorter than half of the total focal length, and larger than the absolute value of the focal length of the second lens120.

The second lens120has negative refractive power, a first surface of the second lens120is convex in the paraxial region, and a second surface of the second lens120is concave in the paraxial region.

The third lens130has positive refractive power, a first surface of the third lens130is convex in the paraxial region, and a second surface of the third lens130is concave in the paraxial region.

The fourth lens140has negative refractive power, a first surface of the fourth lens140is convex in the paraxial region, and a second surface is concave in the paraxial region.

The fifth lens150has positive refractive power, a first surface of the fifth lens150is convex in the paraxial region, and a second surface is concave in the paraxial region. In addition, in a region except for the paraxial region, the first surface of the fifth lens150is convex, and the second surface is concave.

Surfaces of the first lens110to the fifth lens150have a non-spherical surface coefficient as illustrated in Table 8, respectively. For example, the object-side surface and the image-side surface of the first lens110to the fifth lens150are all non-spherical surfaces.

Further, the thus configured optical imaging system has aberration characteristics illustrated inFIGS. 10 and 11.

An example of the second embodiment of the optical imaging system3will be described with reference toFIGS. 12 to 14.

The second embodiment of the optical imaging system3includes a first lens210, a second lens220, a third lens230, a fourth lens240, and a fifth lens250.

InFIG. 12, reference numeral260denotes an infrared light blocking filter, and reference numeral270denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thickness of a lens, distance between lenses, a refractive index, an Abbe number, an effective aperture radius, and the like) are illustrated in Table 9.

The total focal length of the optical imaging system3is 15 mm.

In the second embodiment of the optical imaging system3, the first lens210has positive refractive power, and a first surface and a second surface of the first lens210are convex in the paraxial region.

A focal length of the first lens210is shorter than half of the total focal length, and larger than the absolute value of the focal length of the second lens220.

The second lens220has negative refractive power, a first surface of the second lens220is convex in the paraxial region, and a second surface of the second lens220is concave in the paraxial region.

The third lens230has positive refractive power, and a first surface of the third lens230is convex in the paraxial region, and a second surface of the third lens230is concave in the paraxial region.

The fourth lens240has negative refractive power, a first surface of the fourth lens240is concave in the paraxial region, and a second surface is convex in the paraxial region.

The fifth lens250has positive refractive power, a first surface of the fifth lens250is convex in the paraxial region, and a second surface is concave in the paraxial region. In addition, in a region except for the paraxial region, the first surface of the fifth lens250is convex, and the second surface is concave.

Surfaces of the first lens210to the fifth lens250have a non-spherical surface coefficient as illustrated in Table 10, respectively. For example, the object-side surface and the image-side surface of the first lens210to the fifth lens250are all non-spherical surfaces.

Further, the thus configured optical imaging system has aberration characteristics illustrated inFIGS. 13 and 14.

An example of the third embodiment of the optical imaging system3will be described with reference toFIGS. 15 to 17.

The third embodiment of the optical imaging system3includes a first lens310, a second lens320, a third lens330, a fourth lens340, and a fifth lens350.

InFIG. 15, reference numeral360denotes an infrared light blocking filter, and reference numeral370denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thickness of a lens, distance between lenses, a refractive index, an Abbe number, an effective aperture radius, and the like) are illustrated in Table 11.

The total focal length of the optical imaging system3is 15 mm.

In the third embodiment of the optical imaging system3, the first lens310has positive refractive power, and a first surface and a second surface of the first lens310are convex in the paraxial region.

A focal length of the first lens310is shorter than half of the total focal length, and larger than the absolute value of the focal length of the second lens320.

The second lens320has negative refractive power, a first surface of the second lens320is convex in the paraxial region, and a second surface of the second lens320is concave in the paraxial region.

The third lens330has positive refractive power, a first surface of the third lens330is convex in the paraxial region, and a second surface of the third lens330is concave in the paraxial region.

The fourth lens340has negative refractive power, a first surface of the fourth lens340is concave in the paraxial region, and a second surface is convex in the paraxial region.

The fifth lens350has positive refractive power, a first surface of the fifth lens350is convex in the paraxial region, and a second surface is concave in the paraxial region. In addition, in a region except for the paraxial region, the first surface of the fifth lens350is convex, and the second surface is concave.

Surfaces of the first lens310to the fifth lens350have a non-spherical surface coefficient as illustrated in Table 12, respectively. For example, the object-side surface and the image-side surface of the first lens310to the fifth lens350are all non-spherical surfaces.

Further, the thus configured optical imaging system has aberration characteristics illustrated inFIGS. 16 and 17.

An example of the fourth embodiment of the optical imaging system3will be described with reference toFIGS. 18 to 20.

The fourth embodiment of the optical imaging system3includes a first lens410, a second lens420, a third lens430, a fourth lens440, and a fifth lens450.

InFIG. 18, reference numeral460denotes an infrared light blocking filter, and reference numeral470denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thickness of a lens, distance between lenses, a refractive index, an Abbe number, an effective aperture radius, and the like) are illustrated in Table 13.

The total focal length of the optical imaging system3is 15 mm.

In the fourth embodiment of the optical imaging system3, the first lens410has positive refractive power, and a first surface and a second surface of the first lens410are convex in the paraxial region.

A focal length of the first lens410is shorter than half of the total focal length, and larger than the absolute value of the focal length of the second lens420.

The second lens420has negative refractive power, a first surface of the second lens420is convex in the paraxial region, and a second surface of the second lens420is concave in the paraxial region.

The third lens430has positive refractive power, a first surface of the third lens430is convex in the paraxial region, and a second surface of the third lens430is concave in the paraxial region.

The fourth lens440has positive refractive power, a first surface of the fourth lens440is concave in the paraxial region, and a second surface is convex in the paraxial region.

The fifth lens450has positive refractive power, a first surface of the fifth lens450is convex in the paraxial region, and a second surface is concave in the paraxial region. In addition, in a region except for the paraxial region, the first surface of the fifth lens450is convex, and the second surface is concave.

Surfaces of the first lens410to the fifth lens450have a non-spherical surface coefficient as illustrated in Table 14, respectively. For example, the object-side surface and the image-side surface of the first lens410to the fifth lens450are all non-spherical surfaces.

Further, the thus configured optical imaging system has aberration characteristics illustrated inFIGS. 19 and 20.

An example of the fifth embodiment of the optical imaging system3will be described with reference toFIGS. 21 to 23.

The fifth embodiment of the optical imaging system3includes a first lens510, a second lens520, a third lens530, a fourth lens540, and a fifth lens550.

InFIG. 21, reference numeral560denotes an infrared light blocking filter, and reference numeral570denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thickness of a lens, distance between lenses, a refractive index, an Abbe number, an effective aperture radius, and the like) are illustrated in Table 15.

The total focal length (f) of the optical imaging system3is 14.9712 mm.

In the fifth embodiment of the optical imaging system3, the first lens510has positive refractive power, and a first surface and a second surface of the first lens510are convex in the paraxial region.

A focal length of the first lens510is shorter than half of the total focal length, and larger than the absolute value of the focal length of the second lens520.

The second lens520has negative refractive power, a first surface of the second lens520is convex in the paraxial region, and a second surface of the second lens520is concave in the paraxial region.

The third lens530has positive refractive power, a first surface of the third lens530is concave in the paraxial region, and a second surface of the third lens530is convex in the paraxial region.

The fourth lens540has negative refractive power, a first surface of the fourth lens540is concave in the paraxial region, and a second surface is convex in the paraxial region.

The fifth lens550has positive refractive power, a first surface of the fifth lens550is convex in the paraxial region, and a second surface is concave in the paraxial region. In addition, in a region except for the paraxial region, the first surface of the fifth lens550is convex, and the second surface is concave.

Surfaces of the first lens510to the fifth lens550have a non-spherical surface coefficient as illustrated in Table 16, respectively. For example, the object-side surface and the image-side surface of the first lens510to the fifth lens550are all non-spherical surfaces.

Further, the thus configured optical imaging system has aberration characteristics illustrated inFIGS. 22 and 23.

Referring to the above embodiments, a lens assembly according to an embodiment of the present disclosure may reduce a size of the lens assembly while securing performance of the lens assembly.

The optical imaging system and the lens assembly including the optical imaging system according to an embodiment of the present disclosure may reduce the size of the optical imaging system and the lens assembly and improve the performance.