OPTICAL IMAGING SYSTEM

An optical imaging system includes a first lens group, including at least one lens disposed on a first optical axis, a second lens group, including at least one lens disposed on a second optical axis, perpendicular to the first optical axis, and a prism disposed between the first lens group and the second lens group to convert a light path from the first optical axis to the second optical axis. A conditional expression 0.20<d(LG1P)/d(PLG2)<0.60 is satisfied, where d(LG1P) is a distance on the first optical axis from an image-side surface of a lens disposed closest to an image side of the first lens group to an incident surface of the prism, and d(PLG2) is a distance on the second optical axis from an exit surface of the prism to an object-side surface of a lens disposed closest to an object side of the second lens group.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 USC 119 (a) of Korean Patent Application Nos. 10-2023-0130723 filed on Sep. 27, 2023, and 10-2024-0005236 filed on Jan. 12, 2024, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes.

BACKGROUND

The present disclosure relates to an optical imaging system.

2. Description of the Background

Recently, in the camera market for mobile devices, the need for slim, high-magnification telephoto camera modules has been increasing. Since high-magnification telephoto camera modules require a long focal length, there may be a problem that physically, an overall length of the camera must increase. Accordingly, the overall length of the camera is secured by arranging a prism, altering a path of incident light, on an object side of a plurality of lenses. Instead, with this structure, there is a limit to increasing a diameter of the lens, which may make it difficult to lower an f-number.

SUMMARY

In one general aspect, an optical imaging system includes a first lens group, including at least one lens disposed in a direction of a first optical axis; a second lens group, including at least one lens disposed in a direction of a second optical axis, perpendicular to the first optical axis; and a prism disposed between the first lens group and the second lens group and configured to convert a path of light from the direction of the first optical axis to the direction of the second optical axis, wherein a conditional expression 0.20<d(LG1P)/d(PLG2)<0.60 is satisfied, where d(LG1P) is a distance on the first optical axis from an image-side surface of a lens disposed closest to an image side of the first lens group to an incident surface of the prism, and d(PLG2) is a distance on the second optical axis from an exit surface of the prism to an object-side surface of a lens disposed closest to an object side of the second lens group.

The first lens group may include a first lens having positive refractive power, and the second lens group may include a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power.

A conditional expression 0.70 (mm−1)≤Fno/dP1<1.00 (mm−1) may be satisfied by the optical imaging system, where Fno is an f-number of the optical imaging system, and dP1 is a distance on the first optical axis from the incident surface of the prism to a reflection surface of the prism.

A conditional expression 0.95≤fLG1/fLG2≤3.50 may be satisfied by the optical imaging system, where fLG1 is a focal length of the first lens group, and fLG2 is a focal length of the second lens group.

A conditional expression 2.20≤Fno<3.20 may be satisfied by the optical imaging system.

A conditional expression 8.00 mm<dLG12<11.00 mm may be satisfied by the optical imaging system, where dLG12 is a distance from an image-side surface of a lens disposed closest to the image side in the first lens group to an object-side surface of a lens disposed closest to an object side in the second lens group.

A conditional expression 0.10≤f/fLG1<0.60 may be satisfied by the optical imaging system, where f is a total focal length of the optical imaging system.

A conditional expression 0.50≤f/fLG2<0.95 may be satisfied by the optical imaging system.

A conditional expression 0.20<dLG2/OAL≤0.40 may be satisfied by the optical imaging system, where dLG2 is a distance on an optical axis from an object-side surface of a lens disposed closest to an object side to an image-side surface of a lens disposed closest to an image side, among lenses included in the second lens group, and OAL is a sum of a distance on the first optical axis from the object-side surface of the lens disposed closest to the object side in the first lens group to the reflection surface of the prism and a distance on the second optical axis from the reflection surface of the prism to an image plane.

In another general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in order from an object side toward an image side, and a prism disposed between the first lens and the second lens to convert a path of incident light from a direction of a first optical axis to a direction of a second optical axis, wherein a conditional expression 8.00 mm<dLG12<11.00 mm is satisfied, where dLG12 is a distance on an optical axis from an image-side surface of the first lens to an object-side surface of the second lens.

The third lens may have negative refractive power, and both an object-side surface and an image-side surface thereof may have a concave shape.

A conditional expression 17.00 mm<R1+R2<30.00 mm may be satisfied by the optical imaging system, where R1 is a radius of curvature of an object-side surface of the first lens, and R2 is a radius of curvature of an image-side surface of the first lens.

The fourth lens may have negative refractive power and a concave image-side surface.

A conditional expression 0.20<dLG2/OAL≤0.40 may be satisfied by the optical imaging system, where dLG2 is a distance from an object-side surface of the second lens to an image-side surface of the sixth lens, and OAL is a sum of a distance on the first optical axis from an object-side surface of the first lens to a reflection surface of the prism and a distance on the second optical axis from the reflection surface of the prism to an image plane.

A conditional expression 0.20≤OAL1/OAL2≤0.35 may be satisfied by the optical imaging system, where OAL1 is a distance on the first optical axis from an object-side surface of the first lens to a reflection surface of the prism, and OAL2 is a distance on the second optical axis from the reflection surface of the prism to an image plane.

The first lens may constitute a first lens group, and the second to sixth lenses may constitute a second lens group.

A conditional expression 1.25<ODL1/PSi<1.60 may be satisfied by the optical imaging system, where ODL1 is half an outer diameter of the first lens, and PSi is a length of an incident surface of the prism in a direction, perpendicular to the first optical axis.

In another general aspect, an optical imaging system includes a first lens group including a first lens having refractive power, a second lens group, including a second lens having refractive power, a third lens having negative refractive power, a fourth lens having refractive power, a fifth lens having refractive power, and a sixth lens having negative refractive power disposed in order from an object side toward an image side, and a prism disposed between the first lens and the second lens to convert a path of incident light from a direction of a first optical axis to a direction of a second optical axis.

The third lens may have a concave object-side surface.

Throughout the drawings and the detailed description, unless otherwise described, the same reference numerals refer to the same elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

Hereinafter, while examples 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.

An aspect of the present disclosure is to provide an optical imaging system having improved low-light image capturing performance. In an example, such an optical imaging system may be adopted in a mobile telephoto camera module.

Herein, numerical values for a radius of curvature of a lens, a thickness, a gap or a distance, a focal length, IMG HT (½ of a diagonal length of an image plane), and an effective radius (semi-aperture) are all in millimeters (mm), and the unit of a field of view (FOV) is degree. Additionally, a thickness of a lens and a gap between lenses refers to a thickness and a gap on an optical axis, respectively.

Herein, an object side may indicate a direction in which an object is disposed, and an image side may indicate, for example, a direction in which an image plane having an image formed thereon is disposed or a direction in which an image sensor is disposed. For example, an object side may indicate a direction along an optical axis in which an object is disposed, and an image side may indicate, a direction along an optical axis in which an image plane in which an image may be formed is disposed.

In the description related to a shape of a lens in this specification, the disclosure that a surface is convex denotes that a paraxial region of the corresponding surface is convex, and the disclosure that a surface is concave denotes that the paraxial region of the corresponding surface is concave. Accordingly, even if one surface of the lens is described as having a convex shape, an edge of the lens may be concave. Similarly, even if one surface of the lens is described as having a concave shape, an edge of the lens may have a convex shape.

An optical imaging system according to example embodiments of the present disclosure may be employed in a telephoto camera module for a mobile device. For example, the mobile device may be any type of portable electronic device, such as a mobile communication terminal, a smart phone, or a tablet PC.

According to example embodiments of the present disclosure, an optical imaging system may include six lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side toward an image side.

Additionally, according to example embodiments of the present disclosure, the optical imaging system may include a plurality of lens groups. For example, the optical imaging system may include a first lens group and a second lens group arranged in order from the object side toward the image side and each including at least one lens among the first to sixth lenses.

The optical imaging system according to example embodiments of the present disclosure may not be comprised of only six lenses, but may also include an optical path conversion member for converting a path of incident light, an image sensor for converting the incident light into an electrical signal, an infrared cut-off filter for blocking light in an infrared range incident on the image sensor, and an aperture for controlling the amount of light.

According to example embodiments of the present disclosure, the optical path conversion member may be a prism, and the prism may be disposed between the first lens group and the second lens group. The prism may be tilt-driven with respect to two axes when correcting camera shake (the optical path conversion member is described herein as a prism, but other types of reflective members (e.g., mirrors) capable of converting the optical path may be adopted in place of the prism). Additionally, the infrared cut-off filter may be disposed between the sixth lens and the image sensor, and the aperture may be disposed inside the second lens group.

An optical imaging system according to example embodiments of the present disclosure may include a plastic lens. For example, at least some of the first to sixth lenses may be formed of plastic, for example, the first to sixth lenses may be formed of plastic.

Additionally, the optical imaging system according to example embodiments of the present disclosure may include an aspherical lens. For example, at least one of the first to sixth lenses may be an aspherical lens, and in at least one of the first to sixth lenses, at least one surface of an object-side surface and an image-side surface may be aspherical. The aspherical surface of the lens is expressed by Equation 1.

In Equation 1, c represents an inverse number of the radius of curvature of a lens, K represents the Conic constant, and Y represents a distance from any point on an aspherical surface of the lens to the optical axis. Additionally, constants A to H and J are aspheric constants from fourth to twentieth order, and Z (or SAG) is a distance in an optical axis direction between any point on the aspherical surface and a vertex of the corresponding aspherical surface.

In example embodiments of the present disclosure, the first lens group may be disposed on an object side of the prism and may include a first lens. The first lens may be disposed in a direction of a first optical axis c1. The second lens group may be disposed on an image side of the prism and may include second to sixth lenses. The second to sixth lenses may be disposed in a direction of a second optical axis c2.

The prism may be disposed between the first lens group and the second lens group to convert a path of incident light from the direction of the first optical axis c1to the direction of the second optical axis c2. The direction of the first optical axis c1and the direction of the second optical axis c2may be substantially perpendicular to each other.

In example embodiments of the present disclosure, the prism may be tilted by a predetermined angle with respect to two axes perpendicular to the second optical axis c2during shake correction of a camera module. Additionally, in example embodiments of the present disclosure, the second lens group may be moved in the direction of the second optical axis c2when adjusting a focus of the camera module.

The optical imaging system according to example embodiments of the present disclosure may satisfy the following conditional expressions.

In Conditional Expression 1, f is a focal length of an entire optical imaging system, and f1 is a focal length of the first lens, and Conditional Expression 1 is related to a focal length range of the first lens to form an appropriate focal length for a telephoto camera module.

In Conditional Expression 2, OAL1 is a distance on the first optical axis from an object-side surface of a lens (or a first lens) disposed closest to the object side in the first lens group to a reflection surface of the prism, and OAL2 is the distance on the second optical axis from the reflection surface of the prism to an image plane. Conditional Expression 2 is related to characteristics (lens lead-type optical system) in which a lens is disposed on an object side of the prism according to embodiments of the present disclosure, and when the conditional expression deviates, it may be difficult to manufacture a module to an appropriate size (length and thickness).

In Conditional Expression 3 and Conditional Expression 4, Fno is an f-number of the optical imaging system, and dP1 is a distance on the first optical axis from an incident surface of the prism to the reflection surface of the prism. Conditional Expression 3 is related to the brightness of the telephoto camera module, and Conditional Expression 4 is related to the brightness performance of a lens lead-type optical system according to example embodiments of the present disclosure.

In Conditional Expression 5 to Conditional Expression 7, fLG1 is a focal length of the first lens group, fLG2 is a focal length of the second lens group, and f is a focal length of the entire optical imaging system. Conditional Expression 5 to Conditional Expression 7 are related to a focal length range of the first lens group and the second lens group to form an appropriate focal length for a telephoto camera module.

In Conditional Expression 8 to Conditional Expression 10, d(LG1P) is a distance on the first optical axis from the image side of the lens (or first lens) disposed closest to the image side in the first lens group to the incident surface of the prism, d(PLG2) is a distance on the second optical axis from an exit surface of the prism to an object-side surface of a lens (or second lens) disposed closest to an object side in the second lens group, and OAL is a sum of a distance on the first optical axis from the object-side surface of the lens (or first lens) disposed closest to the object side in the first lens group to the reflection surface of the prism and a distance on the second optical axis from the reflection surface of the prism to the image plane. Conditional Expression 8 and Conditional Expression 10 are related to characteristics that a gap between the prism and the second lens group according to the example embodiments of the present disclosure is large, and are for focus adjustment and shake correction operation. Conditional Expression 9 is a condition for miniaturization of the module under the shape condition of the first lens.

In Conditional Expression 11, d(LG12) is a sum of a distance on the first optical axis from the image-side surface of the lens (or first lens) disposed closest to the image side in the first lens group to the reflection surface of the prism and a distance on the second optical axis from the reflection surface of the prism to the object-side surface of the lens (or second lens) disposed closest to the object in the second lens group. Conditional Expression 11 is related to characteristics that a gap between the prism and the first lens group and the second lens group according to example embodiments of the present disclosure is large.

In Conditional Expression 12 and Conditional Expression 13, dP is a sum of a distance on the first optical axis from the incident surface of the prism to the reflection surface of the prism and a distance on the second optical axis from the reflection surface of the prism to the exit surface of the prism, ODL1 is half an outer diameter of the lens (or first lens) disposed closest to the object side in the first lens group, and PSi is half a length of the incident surface of the prism in a direction, perpendicular to the first optical axis. Here, the direction perpendicular to the first optical axis may denote a direction substantially parallel to the second optical axis among the two directions, perpendicular to the first optical axis. Conditional Expression 12 and Conditional Expression 13 are related to the prism miniaturization characteristics according to example embodiments of the present disclosure.

In Conditional Expression 14, R1 and R2 are curvature radii of the object-side surface and the image-side surface of the first lens, respectively, and Conditional Expression 14 is related to a curvature (shape) condition of the first lens for prism miniaturization.

In Conditional Expression 15, dLG2 is a distance on the optical axis from the object-side surface of the lens (or second lens) disposed closest to the object to an image-side surface of a lens (or sixth lens) disposed closest to the image side, among the lenses included in the second lens group. Conditional Expression 15 is related to characteristics that a distance between the prism and the second lens group according to the example embodiments of the present disclosure is large, and is intended to secure a driving space.

Additionally, the optical imaging system according to example embodiments of the present disclosure may additionally satisfy the following conditional expressions.

In Conditional Expression 16 and Conditional Expression 17, dP1 is a distance on the first optical axis from the incident surface of the prism to the reflection surface thereof, and ODL2 is half an outer diameter of the lens (or second lens) disposed closest to the object side in the second lens group. Conditional Expression 16 and Conditional Expression 17 are related to distances and conditions between the prism and the first lens group and the second lens group for tilt-driving of the prism, and when the conditional expressions deviate from the range, it may be difficult to secure sufficient distances therebetween, or the volume of the optical system may increase, which may disadvantageous in ensuring portability.

In Conditional Expression 18, dLG1 is a distance from the object-side surface of the lens (or first lens) disposed closest to the object side in the first lens group to the image-side surface of the lens (or first lens) disposed closest to the image side, and Conditional Expression 18 suggests an appropriate distance range between the first lens group and the prism in terms of securing prism a driving space and miniaturizing the module.

Conditional Expression 19 is related to the shape condition of the first lens for a lens through which light is incident, that is, the first lens to have an appropriate focal length, and when the conditional expression deviates from the range, the refractive power may be significantly reduced so that a focal length becomes significantly long, or vice versa, which may increase the aberration burden on subsequent lenses.

In Conditional Expression 20, R3 is a radius of curvature of the object-side surface of the second lens, and is a shape condition of the second lens for the optical system to have an appropriate size (length and thickness).

Conditional Expression 21 and Conditional Expression 22 respectively suggest an appropriate range related to a distance between the prism and the second lens group, and Conditional Expression 22 suggests an appropriate range related to a size of the optical system.

Hereinafter, an optical imaging system according to example embodiments of the present disclosure will be described with reference to the attached drawings.

First Embodiment

FIG.1Ais a block diagram of an optical imaging system according to a first embodiment of the present disclosure, andFIG.1Bis a graph illustrating aberration characteristics of an optical imaging system according to the first embodiment of the present disclosure.

An optical imaging system100according to a first embodiment may include a first lens110, a second lens120, a third lens130, a fourth lens140, a fifth lens150, and a sixth lens160arranged in order from an object side toward an image side, and may further include an infrared cut-off filter170and an image sensor180disposed on an image side of the sixth lens160.

The first lens110may have positive refractive power. An object-side surface of the first lens110may have a convex shape in the paraxial region, and an image-side surface of the first lens110may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens110may be formed of plastic. The first lens110may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens110may be aspherical.

The second lens120may have positive refractive power. An object-side surface and an image-side surface of the second lens120may have a convex shape in the paraxial region. The second lens120may be formed of plastic. The second lens120may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens120may be aspherical.

The third lens130may have negative refractive power. An object-side surface and an image-side surface of the third lens130may have a concave shape in the paraxial region. The third lens130may be formed of plastic. In detail, the third lens130may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens120. The third lens130may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens130may be aspherical.

The fourth lens140may have negative refractive power. An object-side surface of the fourth lens140has a convex shape in the paraxial region, and an image-side surface of the fourth lens140may have a concave shape in the paraxial region. The fourth lens140may be formed of plastic. In detail, the fourth lens140may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens130. The fourth lens140may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens140may be aspherical.

The fifth lens150may have positive refractive power. An object-side surface and an image-side surface of the fifth lens150may have a convex shape in the paraxial region. The fifth lens150may be formed of plastic. In detail, the fifth lens150may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens140. The fifth lens150may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens150may be aspherical.

The sixth lens160may have negative refractive power. An object-side surface and an image-side surface of the sixth lens160may have a concave shape in the paraxial region. The sixth lens160may be formed of plastic. In detail, the sixth lens160may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens150. The sixth lens160may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens160may be aspherical.

A prism P may be disposed between the first lens110and the second lens120. The first lens110disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses120to160disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 1 illustrates optical and physical parameters of the optical imaging system100according to the first embodiment of the present disclosure.

Table 2 illustrates aspheric data of the optical system imaging100according to the first embodiment of the present disclosure.

Second Embodiment

FIG.2Ais a block diagram of an optical imaging system according to a second embodiment of the present disclosure, andFIG.2Bis a graph illustrating aberration characteristics of an optical imaging system according to the second embodiment of the present disclosure.

An optical imaging system200according to the second embodiment may include a first lens210, a second lens220, a third lens230, a fourth lens240, a fifth lens250, and a sixth lens260arranged in order from an object side toward an image side, and may further include an infrared cut-off filter270and an image sensor280disposed on an image side of the sixth lens260.

The first lens210may have positive refractive power. An object-side surface of the first lens210may have a convex shape in the paraxial region, and an image-side surface of the first lens210may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens210may be formed of plastic. The first lens210may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens210may be aspherical.

The second lens220may have positive refractive power. An object-side surface and an image-side surface of the second lens220may have a convex shape in the paraxial region. The second lens220may be formed of plastic. The second lens220may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens220may be aspherical.

The third lens230may have negative refractive power. An object-side surface and an image-side surface of the third lens230may have a concave shape in the paraxial region. The third lens230may be formed of plastic. In detail, the third lens230may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens220. The third lens230may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens230may be aspherical.

The fourth lens240may have negative refractive power. An object-side surface of the fourth lens240may have a convex shape in the paraxial region, and an image-side surface of the fourth lens240may have a concave shape in the paraxial region. The fourth lens240may be formed of plastic. In detail, the fourth lens240may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens230. The fourth lens240may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens240may be aspherical.

The fifth lens250may have positive refractive power. An object-side surface and an image-side surface of the fifth lens250may have a convex shape in the paraxial region. The fifth lens250may be formed of plastic. In detail, the fifth lens250may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens240. The fifth lens250may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens250may be aspherical.

The sixth lens260may have negative refractive power. An object-side surface and an image-side surface of the sixth lens260may have a concave shape in the paraxial region. The sixth lens260may be formed of plastic. In detail, the sixth lens260may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens250. The sixth lens260may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens260may be aspherical.

A prism P may be disposed between the first lens210and the second lens220. The first lens210disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses220to260disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 3 illustrates optical and physical parameters of the optical imaging system200according to the second embodiment of the present disclosure.

Table 4 illustrates aspheric data of the optical imaging system200according to the second embodiment of the present disclosure.

Third Embodiment

FIG.3Ais a block diagram of an optical imaging system according to a third embodiment of the present disclosure, andFIG.3Bis a graph illustrating aberration characteristics of an optical imaging system according to the third embodiment of the present disclosure.

An optical imaging system300according to the third embodiment may include a first lens310, a second lens320, a third lens330, a fourth lens340, a fifth lens350, and a sixth lens360arranged in order from an object side toward an image side, and may further include an infrared cut-off filter370and an image sensor380disposed on an image side of the sixth lens360.

The first lens310may have positive refractive power. An object-side surface of the first lens310may have a convex shape in the paraxial region, and an image-side surface of the first lens310may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens310may be formed of plastic. The first lens310may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens310may be aspherical.

The second lens320may have positive refractive power. An object-side surface and an image-side surface of the second lens320may have a convex shape in the paraxial region. The second lens320may be formed of plastic. The second lens320may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens320may be aspherical.

The third lens330may have negative refractive power. An object-side surface and an image-side surface of the third lens330may have a concave shape in the paraxial region. The third lens330may be formed of plastic. In detail, the third lens330may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens320. The third lens330may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens330may be aspherical.

The fourth lens340may have negative refractive power. An object-side surface of the fourth lens340may have a convex shape in the paraxial region, and an image-side surface of the fourth lens340may have a concave shape in the paraxial region. The fourth lens340may be formed of plastic. In detail, the fourth lens340may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens330. The fourth lens340may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens340may be aspherical.

The fifth lens350may have positive refractive power. An object-side surface and an image-side surface of the fifth lens350may have a convex shape in the paraxial region. The fifth lens350may be formed of plastic. In detail, the fifth lens350may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens340. The fifth lens350may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens350may be aspherical.

The sixth lens360may have negative refractive power. An object-side surface and an image-side surface of the sixth lens360may have a concave shape in the paraxial region. The sixth lens360may be formed of plastic. In detail, the sixth lens360may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens350. The sixth lens360may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens360may be aspherical.

A prism P may be disposed between the first lens310and the second lens320. The first lens310disposed on the object side with respect to the prism P may constitute the first lens group LG1, and the second to sixth lenses320to360disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 5 illustrates optical and physical parameters of the optical imaging system300according to the third embodiment of the present disclosure.

Table 6 illustrates aspheric data of the optical imaging system300according to the third embodiment of the present disclosure.

Fourth Embodiment

FIG.4Ais a block diagram of an optical imaging system according to a fourth embodiment of the present disclosure, andFIG.4Bis a graph illustrating aberration characteristics of an optical imaging system according to the fourth embodiment of the present disclosure.

An optical imaging system400according to the fourth embodiment may include a first lens410, a second lens420, a third lens430, a fourth lens440, a fifth lens450, and a sixth lens460arranged in order from an object side toward an image side, and may further include an infrared cut-off filter470and an image sensor480disposed on an image side of the sixth lens460.

The first lens410may have positive refractive power. An object-side surface of the first lens410may have a convex shape in the paraxial region, and an image-side surface of the first lens410may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens410may be formed of plastic. The first lens410may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens410may be aspherical.

The second lens420may have positive refractive power. An object-side surface and an image-side surface of the second lens420may have a convex shape in the paraxial region. The second lens420may be formed of plastic. The second lens420may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens420may be aspherical.

The third lens430may have negative refractive power. An object-side surface and an image-side surface of the third lens430may have a concave shape in the paraxial region. The third lens430may be formed of plastic. In detail, the third lens430may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens420. The third lens430may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens430may be aspherical.

The fourth lens440may have positive refractive power. An object-side surface and an image-side surface of the fourth lens440may have a convex shape in the paraxial region. The fourth lens440may be formed of plastic. In detail, the fourth lens440may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens430. The fourth lens440may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens440may be aspherical.

The fifth lens450may have positive refractive power. An object-side surface and an image-side surface of the fifth lens450may have a convex shape in the paraxial region. The fifth lens450may be formed of plastic. In detail, the fifth lens450may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens440. The fifth lens450may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens450may be aspherical.

The sixth lens460may have negative refractive power. An object-side surface and an image-side surface of the sixth lens460may have a concave shape in the paraxial region. The sixth lens460may be formed of plastic. In detail, the sixth lens460may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens450. The sixth lens460may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens460may be aspherical.

A prism P may be disposed between the first lens410and the second lens420. The first lens410disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses420to460disposed on the image side with respect to the prism P may constitute the second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 7 illustrates optical and physical parameters of the optical imaging system400according to the fourth embodiment of the present disclosure.

Table 8 illustrates aspheric data of the optical imaging system400according to the fourth embodiment of the present disclosure.

Fifth Embodiment

FIG.5Ais a block diagram of an optical imaging system according to a fifth embodiment of the present disclosure, andFIG.5Bis a graph illustrating aberration characteristics of an optical imaging system according to the fifth embodiment of the present disclosure

An optical imaging system500according to the fifth embodiment may include a first lens510, a second lens520, a third lens530, a fourth lens540, a fifth lens550, and a sixth lens560arranged in order from an object side toward an image side, may further include an infrared cut-off filter570and an image sensor580disposed on an image side of the sixth lens560.

The first lens510may have positive refractive power. An object-side surface of the first lens510may have a convex shape in the paraxial region, and an image-side surface of the first lens510may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens510may be formed of plastic. The first lens510may be formed of an aspherical lens. For example, the object-side surface and the image-side surface of the first lens510may be aspherical.

The second lens520may have positive refractive power. An object-side surface and an image-side surface of the second lens520may have a convex shape in the paraxial region. The second lens520may be formed of plastic. The second lens520may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens520may be aspherical.

The third lens530may have negative refractive power. An object-side surface and an image-side surface of the third lens530may have a concave shape in the paraxial region. The third lens530may be formed of plastic. In detail, the third lens530may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens520. The third lens530may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens530may be aspherical.

The fourth lens540may have positive refractive power. An object-side surface of the fourth lens540may have a convex shape in the paraxial region, and an image-side surface of the fourth lens540may have a concave shape in the paraxial region. The fourth lens540may be formed of plastic. In detail, the fourth lens540may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens530. The fourth lens540may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens540may be aspherical.

The fifth lens550may have positive refractive power. An object-side surface and an image-side surface of the fifth lens550may have a convex shape in the paraxial region. The fifth lens550may be formed of plastic. In detail, the fifth lens550may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens540. The fifth lens550may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens550may be aspherical.

The sixth lens560may have negative refractive power. An object-side surface and an image-side surface of the sixth lens560may have a concave shape in the paraxial region. The sixth lens560may be formed of plastic. In detail, the sixth lens560may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens550. The sixth lens560may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens560may be aspherical.

A prism P may be disposed between the first lens510and the second lens520. The first lens510disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses520to560disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 9 illustrates optical and physical parameters of the optical imaging system500according to the fifth embodiment of the present disclosure.

Table 10 illustrates aspheric data of the optical imaging system500according to the fifth embodiment of the present disclosure.

Six Embodiment

FIG.6Ais a block diagram of an optical imaging system according to a sixth embodiment of the present disclosure, andFIG.6Bis a graph illustrating aberration characteristics of an optical imaging system according to the sixth embodiment of the present disclosure.

An optical imaging system600according to the sixth embodiment includes a first lens610, a second lens620, a third lens630, a fourth lens640, a fifth lens650, and a sixth lens660arranged in order from an object side toward an image side, and may further include an infrared cut-off filter670and an image sensor680disposed on an image side of the sixth lens660.

The first lens610may have positive refractive power. An object-side surface of the first lens610may have a convex shape in the paraxial region, and an image-side surface of the first lens610may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens610may be formed of plastic. The first lens610may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens610may be aspherical.

The second lens620may have positive refractive power. An object-side surface and an image-side surface of the second lens620may have a convex shape in the paraxial region. The second lens620may be formed of plastic. The second lens620may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens620may be aspherical.

The third lens630may have negative refractive power. An object-side surface and an image-side surface of the third lens630may have a concave shape in the paraxial region. The third lens630may be formed of plastic. In detail, the third lens630may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens620. The third lens630may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens630may be aspherical.

The fourth lens640may have positive refractive power. An object-side surface of the fourth lens640may be convex in the paraxial region, and an image-side surface of the fourth lens640may have a concave shape in the paraxial region. The fourth lens640may be formed of plastic. In detail, the fourth lens640may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens630. The fourth lens640may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens640may be aspherical.

The fifth lens650may have positive refractive power. An object-side surface and an image-side surface of the fifth lens650may have a convex shape in the paraxial region. The fifth lens650may be formed of plastic. In detail, the fifth lens650may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens640. The fifth lens650may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens650may be aspherical.

The sixth lens660may have negative refractive power. An object-side surface and an image-side surface of the sixth lens660may have a concave shape in the paraxial region. The sixth lens660may be formed of plastic. In detail, the sixth lens660may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens650. The sixth lens660may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens660may be aspherical.

A prism P may be disposed between the first lens610and the second lens620. The first lens610disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses620to660disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 11 illustrates optical and physical parameters of the optical imaging system600according to the sixth embodiment of the present disclosure.

Table 12 illustrates aspheric data of the optical imaging system600according to the sixth embodiment of the present disclosure.

Seventh Embodiment

FIG.7Ais a block diagram of an optical imaging system according to a seventh embodiment of the present disclosure, andFIG.7Bis a graph illustrating aberration characteristics of an optical imaging system according to the seventh embodiment of the present disclosure.

An optical imaging system700according to the seventh embodiment may include a first lens710, a second lens720, a third lens730, a fourth lens740, a fifth lens750, and a sixth lens760arranged in order from an object side toward an image side, and may further include an infrared cut-off filter770and an image sensor780disposed on an image side of the sixth lens760.

The first lens710may have positive refractive power. An object-side surface of the first lens710may have a convex shape in the paraxial region, and an image-side surface of the first lens710may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens710may be formed of plastic. The first lens710may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens710may be aspherical.

The second lens720may have positive refractive power. An object-side surface and an image-side surface of the second lens720may have a convex shape in the paraxial region. The second lens720may be formed of plastic. The second lens720may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens720may be aspherical.

The third lens730may have negative refractive power. An object-side surface and an image-side surface of the third lens730may have a concave shape in the paraxial region. The third lens730may be formed of plastic. In detail, the third lens730may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens720. The third lens730may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens730may be aspherical.

The fourth lens740may have positive refractive power. An object-side surface of the fourth lens740may be convex in the paraxial region, and an image-side surface of the fourth lens740may be concave in the paraxial region. The fourth lens740may be formed of plastic. In detail, the fourth lens740may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens730. The fourth lens740may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens740may be aspherical.

The fifth lens750may have positive refractive power. An object-side surface and an image-side surface of the fifth lens750may have a convex shape in the paraxial region. The fifth lens750may be formed of plastic. In detail, the fifth lens750may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens740. The fifth lens750may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens750may be aspherical.

The sixth lens760may have negative refractive power. An object-side surface and an image-side surface of the sixth lens760may have a concave shape in the paraxial region. The sixth lens760may be formed of plastic. In detail, the sixth lens760may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens750. The sixth lens760may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens760may be aspherical.

A prism P may be disposed between the first lens710and the second lens720. The first lens710disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses720to760disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 13 illustrates optical and physical parameters of the optical imaging system700according to the seventh embodiment of the present disclosure.

Table 14 illustrates aspheric data of the optical imaging system700according to the seventh embodiment of the present disclosure.

Eighth Embodiment

FIG.8Ais a block diagram of an optical imaging system according to an eighth embodiment of the present disclosure, andFIG.8Bis a graph illustrating aberration characteristics of an optical imaging system according to then eighth embodiment of the present disclosure.

An optical imaging system800according to the eighth embodiment may include a first lens810, a second lens820, a third lens830, a fourth lens840, a fifth lens850, and a sixth lens860arranged in order from an object side toward an image side, and may further include an infrared cut-off filter870and an image sensor880disposed on an image side of the sixth lens860.

The first lens810may have positive refractive power. An object-side surface of the first lens810may have a convex shape in the paraxial region, and an image-side surface of the first lens810may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens810may be formed of plastic. The first lens810may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens810may be aspherical.

The second lens820may have positive refractive power. The object-side surface and the image-side surface of the second lens820may have a convex shape in the paraxial region. The second lens820may be formed of plastic. The second lens820may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens820may be aspherical.

The third lens830may have negative refractive power. An object-side surface and an image-side surface of the third lens830may have a concave shape in the paraxial region. The third lens830may be formed of plastic. In detail, the third lens830may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens820. The third lens830may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens830may be aspherical.

The fourth lens840may have positive refractive power. An object-side surface of the fourth lens840may have a convex shape in the paraxial region, and an image-side surface of the fourth lens840may have a concave shape in the paraxial region. The fourth lens840may be formed of plastic. In detail, the fourth lens840may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens830. The fourth lens840may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens840may be aspherical.

The fifth lens850may have positive refractive power. An object-side surface and an image-side surface of the fifth lens850may have a convex shape in the paraxial region. The fifth lens850may be formed of plastic. In detail, the fifth lens850may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens840. The fifth lens850may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens850may be aspherical.

The sixth lens860may have negative refractive power. An object-side surface and an image-side surface of the sixth lens860may have a concave shape in the paraxial region. The sixth lens860may be formed of plastic. In detail, the sixth lens860may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens850. The sixth lens860may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens860may be aspherical.

A prism P may be disposed between the first lens810and the second lens820. The first lens810disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses820to860disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 15 illustrates optical and physical parameters of the optical imaging system800according to the eighth embodiment of the present disclosure.

Table 16 illustrates aspheric data of the optical imaging system800according to the eighth embodiment of the present disclosure.

Ninth Embodiment

FIG.9Ais a block diagram of an optical imaging system according to a ninth embodiment of the present disclosure, andFIG.9Bis a graph illustrating aberration characteristics of an optical imaging system according to the ninth embodiment of the present disclosure.

An optical imaging system900according to the ninth embodiment may include a first lens910, a second lens920, a third lens930, a fourth lens940, a fifth lens950, and a sixth lens960arranged in order from an object side toward an image side, and may further include an infrared cut-off filter970and an image sensor980disposed on an image side of the sixth lens960.

The first lens910may have positive refractive power. An object-side surface of the first lens910may have a convex shape in the paraxial region, and an image-side surface of the first lens910may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens910may be formed of plastic. The first lens910may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens910may be aspherical.

The second lens920may have positive refractive power. An object-side surface and an image-side surface of the second lens920may have a convex shape in the paraxial region. The second lens920may be formed of plastic. The second lens920may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens920may be aspherical.

The third lens930may have negative refractive power. An object-side surface and an image-side surface of the third lens930may have a concave shape in the paraxial region. The third lens930may be formed of plastic. In detail, the third lens930may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens920. The third lens930may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens930may be aspherical.

The fourth lens940may have positive refractive power. An object-side surface of the fourth lens940may be convex in the paraxial region, and an image-side surface of the fourth lens940may be concave in the paraxial region. The fourth lens940may be formed of plastic. In detail, the fourth lens940may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens930. The fourth lens940may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens940may be aspherical.

The fifth lens950may have positive refractive power. An object-side surface and an image-side surface of the fifth lens950may have a convex shape in the paraxial region. The fifth lens950may be formed of plastic. In detail, the fifth lens950may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens940. The fifth lens950may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens950may be aspherical.

The sixth lens960may have negative refractive power. The object-side surface and the image-side surface of the sixth lens960may have a concave shape in the paraxial region. The sixth lens960may be formed of plastic. In detail, the sixth lens960may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens950. The sixth lens960may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens960may be aspherical.

A prism P may be disposed between the first lens910and the second lens920. The first lens910disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses920to960disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 17 illustrates optical and physical parameters of the optical imaging system900according to the ninth embodiment of the present disclosure.

Table 18 illustrates aspheric data of the optical imaging system900according to the ninth embodiment of the present disclosure.

Tenth Embodiment

FIG.10Ais a block diagram of an optical imaging system according to a tenth embodiment of the present disclosure, andFIG.10Bis a graph illustrating aberration characteristics of an optical imaging system according to the tenth embodiment of the present disclosure.

An optical imaging system1000according to the tenth embodiment may include a first lens1010, a second lens1020, a third lens1030, a fourth lens1040, a fifth lens1050, and a sixth lens1060arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1070and an image sensor1080disposed on an image side of the sixth lens1060.

The first lens1010may have positive refractive power. An object-side surface of the first lens1010may have a convex shape in the paraxial region, and an image-side surface of the first lens1010may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1010may be formed of plastic. The first lens1010may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1010may be aspherical.

The second lens1020may have positive refractive power. An object-side surface and an image-side surface of the second lens1020may have a convex shape in the paraxial region. The second lens1020may be formed of plastic. The second lens1020may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1020may be aspherical.

The third lens1030may have negative refractive power. An object-side surface and an image-side surface of the third lens1030may have a concave shape in the paraxial region. The third lens1030may be formed of plastic. In detail, the third lens1030may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1020. The third lens1030may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1030may be aspherical.

The fourth lens1040may have positive refractive power. An object-side surface of the fourth lens1040may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1040may have a convex shape in the paraxial region. The fourth lens1040may be formed of plastic. In detail, the fourth lens1040may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1030. The fourth lens1040may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1040may be aspherical.

The fifth lens1050may have positive refractive power. An object-side surface of the fifth lens1050may have a concave shape in the paraxial region, and an image-side surface of the fifth lens1050may have a convex shape in the paraxial region. The fifth lens1050may be formed of plastic. In detail, the fifth lens1050may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1040. The fifth lens1050may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1050may be aspherical.

The sixth lens1060may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1060may have a concave shape in the paraxial region. The sixth lens1060may be formed of plastic. In detail, the sixth lens1060may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1050. The sixth lens1060may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1060may be aspherical.

A prism P may be disposed between the first lens1010and the second lens1020. The first lens1010disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1020to1060disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 19 illustrates optical and physical parameters of the optical imaging system1000according to the tenth embodiment of the present disclosure.

Table 20 illustrates aspheric data of the optical imaging system1000according to the tenth embodiment of the present disclosure.

Eleventh Embodiment

FIG.11Ais a block diagram of an optical imaging system according to an eleventh embodiment of the present disclosure, andFIG.11Bis a graph illustrating aberration characteristics of an optical imaging system according to the eleventh embodiment of the present disclosure.

An optical imaging system1100according to the eleventh embodiment may include a first lens1110, a second lens1120, a third lens1130, a fourth lens1140, a fifth lens1150, and a sixth lens1160arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1170and an image sensor1180disposed on an image side of the sixth lens1160.

The first lens1110may have positive refractive power. An object-side surface of the first lens1110may have a convex shape in the paraxial region, and an image-side surface of the first lens1110may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1110may be formed of plastic. The first lens1110may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1110may be aspherical.

The second lens1120may have positive refractive power. An object-side surface and an image-side surface of the second lens1120may have a convex shape in the paraxial region. The second lens1120may be formed of plastic. The second lens1120may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1120may be aspherical.

The third lens1130may have negative refractive power. An object-side surface and an image-side surface of the third lens1130may have a concave shape in the paraxial region. The third lens1130may be formed of plastic. In detail, the third lens1130may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1120. The third lens1130may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1130may be aspherical.

The fourth lens1140may have positive refractive power. An object-side surface of the fourth lens1140may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1140may have a convex shape in the paraxial region. The fourth lens1140may be formed of plastic. In detail, the fourth lens1140may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1130. The fourth lens1140may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1140may be aspherical.

The fifth lens1150may have positive refractive power. The object-side surface of the fifth lens1150may be concave in the paraxial region, and the image-side surface of the fifth lens1150may be convex in the paraxial region. The fifth lens1150may be formed of plastic. In detail, fifth lens1150may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1140. The fifth lens1150may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1150may be aspherical.

The sixth lens1160may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1160may have a concave shape in the paraxial region. The sixth lens1160may be formed of plastic. In detail, the sixth lens1160may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1150. The sixth lens1160may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1160may be aspherical.

A prism P may be disposed between the first lens1110and the second lens1120. The first lens1110disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1120to1160disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 21 illustrates optical and physical parameters of the optical imaging system1100according to the eleventh embodiment of the present disclosure.

Table 22 illustrates aspheric data of the optical imaging system1100according to the eleventh embodiment of the present disclosure.

Twelfth Embodiment

FIG.12Ais a block diagram of an optical imaging system according to a twelfth embodiment of the present disclosure, andFIG.12Bis a graph illustrating aberration characteristics of an optical imaging system according to the twelfth embodiment of the present disclosure.

An optical imaging system1200according to the twelfth embodiment may include a first lens1210, a second lens1220, a third lens1230, a fourth lens1240, a fifth lens1250and a sixth lens1260arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1270and an image sensor1280disposed on an image side of the sixth lens1260.

The first lens1210may have positive refractive power. An object-side surface of the first lens1210may have a convex shape in the paraxial region, and an image-side surface of the first lens1210may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1210may be formed of plastic. The first lens1210may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1210may be aspherical.

The second lens1220may have positive refractive power. An object-side surface and an image-side surface of the second lens1220may have a convex shape in the paraxial region. The second lens1220may be formed of plastic. The second lens1220may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1220may be aspherical.

The third lens1230may have negative refractive power. An object-side surface and an image-side surface of the third lens1230may have a concave shape in the paraxial region. The third lens1230may be formed of plastic. In detail, the third lens1230may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1220. The third lens1230may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1230may be aspherical.

The fourth lens1240may have positive refractive power. An object-side surface of the fourth lens1240may have a concave shape in the paraxial region, and the image-side surface of the fourth lens1240may have a convex shape in the paraxial region. The fourth lens1240may be formed of plastic. In detail, the fourth lens1240may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1230. The fourth lens1240may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1240may be aspherical.

The fifth lens1250may have positive refractive power. An object-side surface of the fifth lens1250may have a concave shape in the paraxial region, and an image-side surface of the fifth lens1250may have a convex shape in the paraxial region. The fifth lens1250may be formed of plastic. In detail, the fifth lens1250may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1240. The fifth lens1250may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1250may be aspherical.

The sixth lens1260may have negative refractive power. The object-side surface and the image-side surface of the sixth lens1260may have a concave shape in the paraxial region. The sixth lens1260may be formed of plastic. In detail, the sixth lens1260may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1250. The sixth lens1260may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1260may be aspherical.

A prism P may be disposed between the first lens1210and the second lens1220. The first lens1210disposed on the object side based on the prism P may constitute a first lens group LG1, and the second to sixth lenses1220to1260disposed on the image side based on the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 23 illustrates optical and physical parameters of the optical imaging system1200according to the twelfth embodiment of the present disclosure.

Table 24 illustrates aspheric data of the optical imaging system1200according to the twelfth embodiment of the present disclosure.

Thirteenth Embodiment

FIG.13Ais a block diagram of an optical imaging system according to a thirteenth embodiment of the present disclosure, andFIG.13Bis a graph illustrating aberration characteristics of an optical imaging system according to the thirteenth embodiment of the present disclosure.

An imaging optical system1300according to the thirteenth embodiment may include a first lens1310, a second lens1320, a third lens1330, a fourth lens1340, a fifth lens1350and a sixth lens1360arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1370and an image sensor1380disposed on an image side of the sixth lens1360.

The first lens1310may have positive refractive power. An object-side surface of the first lens1310may have a convex shape in the paraxial region, and an image-side surface of the first lens1310may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1310may be formed of plastic. The first lens1310may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1310may be aspherical.

The second lens1320may have positive refractive power. An object-side surface and an image-side surface of the second lens1320may have a convex shape in the paraxial region. The second lens1320may be formed of plastic. The second lens1320may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1320may be aspherical.

The third lens1330may have negative refractive power. An object-side surface and an image-side surface of the third lens1330may have a concave shape in the paraxial region. The third lens1330may be formed of plastic. In detail, the third lens1330may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1320. The third lens1330may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1330may be aspherical.

The fourth lens1340may have positive refractive power. An object-side surface of the fourth lens1340may be concave in the paraxial region, and an image-side surface of the fourth lens1340may be convex in the paraxial region. The fourth lens1340may be formed of plastic. In detail, the fourth lens1340may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1330. The fourth lens1340may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1340may be aspherical.

The fifth lens1350may have positive refractive power. An object-side surface of the fifth lens1350may have a concave shape in the paraxial region, and the image-side surface of the fifth lens1350may have a convex shape in the paraxial region. The fifth lens1350may be formed of plastic. In detail, the fifth lens1350may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1340. The fifth lens1350may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1350may be aspherical.

The sixth lens1360may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1360may have a concave shape in the paraxial region. The sixth lens1360may be formed of plastic. In detail, the sixth lens1360may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1350. The sixth lens1360may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1360may be aspherical.

A prism P may be disposed between the first lens1310and the second lens1320. The first lens1310disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1320to1360disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 25 illustrates optical and physical parameters of the optical imaging system1300according to the thirteenth embodiment of the present disclosure.

Table 26 illustrates aspheric data of the optical imaging system1300according to the thirteenth embodiment of the present disclosure.

Fourteenth Embodiment

FIG.14Ais a block diagram of an optical imaging system according to a fourteenth embodiment of the present disclosure, andFIG.14Bis a graph illustrating aberration characteristics of an optical imaging system according to the fourteenth embodiment of the present disclosure.

An imaging optical system1400according to the fourteenth embodiment may include a first lens1410, a second lens1420, a third lens1430, a fourth lens1440, a fifth lens1450, and a sixth lens1460arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1470and an image sensor1480disposed on an image side of the sixth lens1460.

The first lens1410may have positive refractive power. An object-side surface of the first lens1410may have a convex shape in the paraxial region, and an image-side surface of the first lens1410may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1410may be formed of plastic. The first lens1410may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1410may be aspherical.

The second lens1420may have positive refractive power. An object-side surface and an image-side surface of the second lens1420may have a convex shape in the paraxial region. The second lens1420may be formed of plastic. The second lens1420may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1420may be aspherical.

The third lens1430may have negative refractive power. An object-side surface and an image-side surface of the third lens1430may have a concave shape in the paraxial region. The third lens1430may be formed of plastic. In detail, the third lens1430may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1420. The third lens1430may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1430may be aspherical.

The fourth lens1440may have negative refractive power. An object-side surface of the fourth lens1440may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1440may have a convex shape in the paraxial region. The fourth lens1440may be formed of plastic. In detail, the fourth lens1440may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1430. The fourth lens1440may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1440may be aspherical.

The fifth lens1450may have positive refractive power. An object-side surface and an image-side surface of the fifth lens1450may have a convex shape in the paraxial region. The fifth lens1450may be formed of plastic. In detail, the fifth lens1450may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1440. The fifth lens1450may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1450may be aspherical.

The sixth lens1460may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1460may have a concave shape in the paraxial region. The sixth lens1460may be formed of plastic. In detail, the sixth lens1460may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1450. The sixth lens1460may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1460may be aspherical.

A prism P may be disposed between the first lens1410and the second lens1420. The first lens1410disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1420to1460disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 27 illustrates optical and physical parameters of the optical imaging system1400according to the fourteenth embodiment of the present disclosure.

Table 28 illustrates aspheric data of the optical imaging system1400according to the fourteenth embodiment of the present disclosure.

Fifteenth Embodiment

FIG.15Ais a block diagram of an optical imaging system according to a fifteenth embodiment of the present disclosure, andFIG.15Bis a graph illustrating aberration characteristics of an optical imaging system according to the fifteenth embodiment of the present disclosure.

An imaging optical system1500according to the fifteenth embodiment may include a first lens1510, a second lens1520, a third lens1530, a fourth lens1540, a fifth lens1550, and a sixth lens1560arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1570and an image sensor1580disposed on an image side of the sixth lens1560.

The first lens1510may have positive refractive power. An object-side surface of the first lens1510may have a convex shape in the paraxial region, and an image-side surface of the first lens1510may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1510may be formed of plastic. The first lens1510may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1510may be aspherical.

The second lens1520may have positive refractive power. An object-side surface and an image-side surface of the second lens1520may have a convex shape in the paraxial region. The second lens1520may be formed of plastic. The second lens1520may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1520may be aspherical.

The third lens1530may have negative refractive power. An object-side surface and an image-side surface of the third lens1530may have a concave shape in the paraxial region. The third lens1530may be formed of plastic. In detail, the third lens1530may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1520. The third lens1530may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1530may be aspherical.

The fourth lens1540may have positive refractive power. An object-side surface of the fourth lens1540may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1540may have a convex shape in the paraxial region. The fourth lens1540may be formed of plastic. In detail, the fourth lens1540may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1530. The fourth lens1540may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1540may be aspherical.

The fifth lens1550may have positive refractive power. An object-side surface of the fifth lens1550may have a concave shape in the paraxial region, and an image-side surface of the fifth lens1550may have a convex shape in the paraxial region. The fifth lens1550may be formed of plastic. In detail, the fifth lens1550may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1540. The fifth lens1550may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1550may be aspherical.

The sixth lens1560may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1560may have a concave shape in the paraxial region. The sixth lens1560may be formed of plastic. In detail, the sixth lens1560may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1550. The sixth lens1560may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1560may be aspherical.

A prism P may be disposed between the first lens1510and the second lens1520. The first lens1510disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1520to1560disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 29 illustrates optical and physical parameters of the optical imaging system1500according to the fifteenth embodiment of the present disclosure.

Table 30 illustrates aspheric data of the optical imaging system1500according to the fifteenth embodiment of the present disclosure.

Sixteenth Embodiment

FIG.16Ais a block diagram of an optical imaging system according to a sixteenth embodiment of the present disclosure, andFIG.16Bis a graph illustrating aberration characteristics of an optical imaging system according to the sixteenth embodiment of the present disclosure.

An imaging optical system1600according to the sixteenth embodiment includes a first lens1610, a second lens1620, a third lens1630, a fourth lens1640, a fifth lens1650, and a sixth lens1660arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1670and an image sensor1680disposed on an image side of the sixth lens1660.

The first lens1610may have positive refractive power. An object-side surface of the first lens1610may have a convex shape in the paraxial region, and an image-side surface of the first lens1610may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1610may be formed of plastic. The first lens1610may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1610may be aspherical.

The second lens1620may have positive refractive power. An object-side surface and an image-side surface of the second lens1620may have a convex shape in the paraxial region. The second lens1620may be formed of plastic. The second lens1620may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1620may be aspherical.

The third lens1630may have negative refractive power. An object-side surface and an image-side surface of the third lens1630may have a concave shape in the paraxial region. The third lens1630may be formed of plastic. In detail, the third lens1630may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1620. The third lens1630may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1630may be aspherical.

The fourth lens1640may have positive refractive power. An object-side surface of the fourth lens1640may have a concave shape in the paraxial region, and the image-side surface of the fourth lens1640may have a convex shape in the paraxial region. The fourth lens1640may be formed of plastic. In detail, the fourth lens1640may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1630. The fourth lens1640may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1640may be aspherical.

The fifth lens1650may have positive refractive power. An object-side surface of the fifth lens1650may have a concave shape in the paraxial region, and an image-side surface of the fifth lens1650may have a convex shape in the paraxial region. The fifth lens1650may be formed of plastic. In detail, the fifth lens1650may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1640. The fifth lens1650may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1650may be aspherical.

The sixth lens1660may have negative refractive power. The object-side surface and the image-side surface of the sixth lens1660may have a concave shape in the paraxial region. The sixth lens1660may be formed of plastic. In detail, the sixth lens1660may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1650. The sixth lens1660may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1660may be aspherical.

A prism P may be disposed between the first lens1610and the second lens1620. The first lens1610disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1620to1660disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 31 illustrates optical and physical parameters of the optical imaging system1600according to the sixteenth embodiment of the present disclosure.

Table 32 illustrates aspheric data of the optical imaging system1600according to the sixteenth embodiment of the present disclosure.

Seventeenth Example

FIG.17Ais a block diagram of an optical imaging system according to a seventeenth embodiment of the present disclosure, andFIG.17Bis a graph illustrating aberration characteristics of an optical imaging system according to the seventeenth embodiment of the present disclosure.

An imaging optical system1700according to the seventeenth embodiment may include a first lens1710, a second lens1720, a third lens1730, a fourth lens1740, a fifth lens1750, and a sixth lens1760arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1770and an image sensor1780disposed on an image side of the sixth lens1760.

The first lens1710may have positive refractive power. An object-side surface of the first lens1710may have a convex shape in the paraxial region, and an image-side surface of the first lens1710may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1710may be formed of plastic. The first lens1710may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1710may be aspherical.

The second lens1720may have positive refractive power. An object-side surface and an image-side surface of the second lens1720may have a convex shape in the paraxial region. The second lens1720may be formed of plastic. The second lens1720may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1720may be aspherical.

The third lens1730may have negative refractive power. An object-side surface and an image-side surface of the third lens1730may have a concave shape in the paraxial region. The third lens1730may be formed of plastic. In detail, the third lens1730may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1720. The third lens1730may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1730may be aspherical.

The fourth lens1740may have negative refractive power. An object-side surface of the fourth lens1740may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1740may have a convex shape in the paraxial region. The fourth lens1740may be formed of plastic. In detail, the fourth lens1740may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1730. The fourth lens1740may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1740may be aspherical.

The fifth lens1750may have positive refractive power. An object-side surface and an image-side surface of the fifth lens1750may have a convex shape in the paraxial region. The fifth lens1750may be formed of plastic. In detail, the fifth lens1750may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1740. The fifth lens1750may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1750may be aspherical.

The sixth lens1760may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1760may have a concave shape in the paraxial region. The sixth lens1760may be formed of plastic. In detail, the sixth lens1760may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1750. The sixth lens1760may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1760may be aspherical.

A prism P may be disposed between the first lens1710and the second lens1720. The first lens1710disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1720to1760disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 33 illustrates optical and physical parameters of the optical imaging system1700according to the seventeenth embodiment of the present disclosure.

Table 34 illustrates aspheric data of the optical imaging system1700according to the seventeenth embodiment of the present disclosure.

Eighteenth Embodiment

FIG.18Ais a block diagram of an optical imaging system according to an eighteenth embodiment of the present disclosure, andFIG.18Bis a graph illustrating aberration characteristics of an optical imaging system according to then eighteenth embodiment of the present disclosure.

An imaging optical system1800according to the eighteenth embodiment may include a first lens1810, a second lens1820, a third lens1830, a fourth lens1840, a fifth lens1850, and a sixth lens1860arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1870and an image sensor1880disposed on an image side of the sixth lens1860.

The first lens1810may have positive refractive power. An object-side surface of the first lens1810may have a convex shape in the paraxial region, and an image-side surface of the first lens1810may be concave in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1810may be formed of plastic. The first lens1810may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1810may be aspherical.

The second lens1820may have positive refractive power. An object-side surface and an image-side surface of the second lens1820may have a convex shape in the paraxial region. The second lens1820may be formed of plastic. The second lens1820may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1820may be aspherical.

The third lens1830may have negative refractive power. An object-side surface and an image-side surface of the third lens1830may have a concave shape in the paraxial region. The third lens1830may be formed of plastic. In detail, the third lens1830may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1820. The third lens1830may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1830may be aspherical.

The fourth lens1840may have negative refractive power. An object-side surface of the fourth lens1840may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1840may have a convex shape in the paraxial region. The fourth lens1840may be formed of plastic. In detail, the fourth lens1840may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1830. The fourth lens1840may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1840may be aspherical.

The fifth lens1850may have positive refractive power. An object-side surface of the fifth lens1850may have a concave shape in the paraxial region, and an image-side surface of the fifth lens1850may have a convex shape in the paraxial region. The fifth lens1850may be formed of plastic. In detail, the fifth lens1850may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1840. The fifth lens1850may be an aspherical lens. For example, an object-side surface and an image-side surface of the fifth lens1850may be aspherical.

The sixth lens1860may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1860may have a concave shape in the paraxial region. The sixth lens1860may be formed of plastic. In detail, the sixth lens1860may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1850. The sixth lens1860may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1860may be aspherical.

A prism P may be disposed between the first lens1810and the second lens1820. The first lens1810disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1820to1860disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 35 illustrates optical and physical parameters of the optical imaging system1800according to the eighteenth embodiment of the present disclosure.

Table 36 illustrates aspheric data of the optical imaging system1800according to the eighteenth embodiment of the present disclosure.

Nineteenth Embodiment

FIG.19Ais a block diagram of an optical imaging system according to a nineteenth embodiment of the present disclosure, andFIG.19Bis a graph illustrating aberration characteristics of an optical imaging system according to the nineteenth embodiment of the present disclosure.

An imaging optical system1900according to the nineteenth embodiment may include a first lens1910, a second lens1920, a third lens1930, a fourth lens1940, a fifth lens1950, and a sixth lens1960arranged in order from an object side toward an image side, and may further include an infrared cut-off filter1970and an image sensor1980disposed on an image side of the sixth lens1960.

The first lens1910may have positive refractive power. An object-side surface of the first lens1910may have a convex shape in the paraxial region, and an image-side surface of the first lens1910may have a concave shape in the paraxial region, that is, a meniscus shape convex toward the object side. The first lens1910may be formed of plastic. The first lens1910may be an aspherical lens. For example, the object-side surface and the image-side surface of the first lens1910may be aspherical.

The second lens1920may have positive refractive power. An object-side surface and an image-side surface of the second lens1920may have a convex shape in the paraxial region. The second lens1920may be formed of plastic. The second lens1920may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens1920may be aspherical.

The third lens1930may have negative refractive power. An object-side surface and an image-side surface of the third lens1930may have a concave shape in the paraxial region. The third lens1930may be formed of plastic. In detail, the third lens1930may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the second lens1920. The third lens1930may be an aspherical lens. For example, the object-side surface and the image-side surface of the third lens1930may be aspherical.

The fourth lens1940may have negative refractive power. An object-side surface of the fourth lens1940may have a concave shape in the paraxial region, and an image-side surface of the fourth lens1940may have a convex shape in the paraxial region. The fourth lens1940may be formed of plastic. In detail, the fourth lens1940may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the third lens1930. The fourth lens1940may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens1940may be aspherical.

The fifth lens1950may have positive refractive power. An object-side surface and an image-side surface of the fifth lens1950may have a convex shape in the paraxial region. The fifth lens1950may be formed of plastic. In detail, the fifth lens1950may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fourth lens1940. The fifth lens1950may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens1950may be aspherical.

The sixth lens1960may have negative refractive power. An object-side surface and an image-side surface of the sixth lens1960may have a concave shape in the paraxial region. The sixth lens1960may be formed of plastic. In detail, the sixth lens1960may be formed of a plastic material with optical properties (e.g., refractive index and Abbe number) different from the fifth lens1950. The sixth lens1960may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens1960may be aspherical.

A prism P may be disposed between the first lens1910and the second lens1920. The first lens1910disposed on the object side with respect to the prism P may constitute a first lens group LG1, and the second to sixth lenses1920to1960disposed on the image side with respect to the prism P may constitute a second lens group LG2. Both the first lens group LG1 and the second lens group LG2 may have positive refractive power.

Table 37 illustrates optical and physical parameters of the optical imaging system1900according to the nineteenth embodiment of the present disclosure.

Table 38 illustrates aspheric data of the optical imaging system1900according to the nineteenth embodiment of the present disclosure.

Table 39 illustrates optical and physical parameters related to focal lengths and conditional expressions of the optical imaging system according to example embodiments of the present disclosure.

The optical imaging system according to example embodiments of the present disclosure described above has the effect of improving low-light image capturing performance.