CN104570280B

CN104570280B - Camera lens module

Info

Publication number: CN104570280B
Application number: CN201410214964.6A
Authority: CN
Inventors: 白在铉
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2013-10-14
Filing date: 2014-05-21
Publication date: 2017-06-30
Anticipated expiration: 2034-05-21
Also published as: KR101580382B1; TWI561846B; TW201543072A; CN104570280A; TW201514531A; KR20150043186A; TWI603115B

Abstract

The present invention provides a kind of camera lens module.The camera lens module may include optical system, and the optical system sequentially includes from the object side to the image side：First lens, with positive refractive power；Second lens, with refractive power；3rd lens, with positive refractive power；4th lens, with refractive power；5th lens, with refractive power；6th lens, with refractive power；7th lens, with negative refractive power.Flex point can be formed in the image interface of the 6th lens.Turning point can be formed in the image interface of the 7th lens.

Description

Lens module

This application claims the rights of korean patent applications No. 10-2013-0122193 and No. 10-2014-0008211, which were filed in the korean intellectual property office on days 10 and 14 in 2013 and 23 in 2014, respectively, the disclosures of which are incorporated herein by reference in their entireties.

Technical Field

The present technology relates generally to a lens module.

Background

Recent mobile communication terminals have been provided with a camera module to capture images and perform video calls. In addition, as the functionality of camera modules provided in mobile communication terminals has gradually increased, cameras for mobile communication terminals have gradually been required to have a high degree of resolution and a high level of performance.

However, due to the trend of miniaturization and weight reduction of mobile communication terminals, there is a limitation in implementing a camera module having a high resolution and a high level of performance.

Recently, lenses provided in camera modules have been made of plastic (a material lighter than glass), and in order to achieve high resolution, five or more lenses have been used to constitute a lens module.

However, when compared with a lens formed of glass, in the case where the lens is formed of plastic, improvement of chromatic aberration and realization of a relatively bright optical system are problematic.

Disclosure of Invention

Some embodiments of the present disclosure may provide a lens module capable of improving an aberration correction effect and realizing a high degree of resolution.

According to some embodiments of the present disclosure, a lens module may sequentially include, from an object side to an image side: a first lens having a positive refractive power; a second lens having refractive power; a third lens having a positive refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; and a seventh lens having a negative refractive power. At least one inflection point may be formed on an image-side surface of the sixth lens. At least one inflection point may be formed on an image-side surface of the seventh lens.

According to some embodiments of the present disclosure, a lens module may sequentially include, from an object side to an image side: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; and a seventh lens having a negative refractive power. At least one inflection point may be formed on an image-side surface of the sixth lens. At least one inflection point may be formed on an image-side surface of the seventh lens.

According to some embodiments of the present disclosure, a lens module may sequentially include, from an object side to an image side: a first lens having a positive refractive power; a second lens having refractive power; a third lens having a negative refractive power; a fourth lens having positive refractive power; a fifth lens having positive refractive power; a sixth lens having refractive power; and a seventh lens having a negative refractive power. At least one inflection point may be formed on an image-side surface of the sixth lens. At least one inflection point may be formed on an image-side surface of the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 1:

[ Condition 1]

1.0<f12/f<2.1

Where f12 is a composite focal length [ mm ] of the first lens and the second lens, and f is an overall focal length [ mm ] of the optical system configured by the first lens to the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 2:

[ Condition 2]

TTL/f<1.40

Where TTL is a distance [ mm ] from the object side surface of the first lens to the image plane, and f is an overall focal length [ mm ] of the optical system configured by the first lens to the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 3:

[ Condition 3]

BFL/f>0.2

Where BFL is a distance [ mm ] from the image side surface of the seventh lens to the image plane, and f is an overall focal length [ mm ] of the optical system configured by the first lens to the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 4:

[ Condition 4]

R1/f>0.35

Where R1 is a radius of curvature [ mm ] of the object side surface of the first lens, and f is an overall focal length [ mm ] of the optical system constructed by the first lens to the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 5:

[ conditional formula 5] -0.6< (R11-R12)/(R11+ R12) <8.0

Where R11 is a radius of curvature [ mm ] of the object side surface of the sixth lens, and R12 is a radius of curvature [ mm ] of the image side surface of the sixth lens.

The lens module of some embodiments may satisfy the following conditional expression 6:

[ conditional formula 6] -2.0< R13/f <1.0

Where R13 is a radius of curvature [ mm ] of the object side surface of the seventh lens, and f is an overall focal length [ mm ] of the optical system constructed by the first lens to the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 7:

[ conditional formula 7] -10.0< (R5-R6)/(R5+ R6) <14.0

Where R5 is a radius of curvature [ mm ] of the object side surface of the third lens, and R6 is a radius of curvature [ mm ] of the image side surface of the third lens.

The lens module of some embodiments may satisfy the following conditional expression 8:

[ conditional formula 8] ANG/f >15.0

Where ANG is an angle of view of the lens module, and f is a total focal length [ mm ] of an optical system configured by the first lens to the seventh lens.

The lens module of some embodiments may satisfy the following conditional expression 9:

[ conditional expression 9] | f1| < | f3 |)

Where f1 is the focal length [ mm ] of the first lens, and f3 is the focal length [ mm ] of the third lens.

Drawings

Exemplary embodiments of the present disclosure will become more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a structural diagram of a lens module according to a first exemplary embodiment of the present disclosure;

fig. 2 is a graph illustrating a Modulation Transfer Function (MTF) of the lens module shown in fig. 1;

fig. 3 is a graph illustrating aberration characteristics of the lens module shown in fig. 1;

fig. 4 is a structural diagram of a lens module according to a second exemplary embodiment of the present disclosure;

fig. 5 is a graph illustrating MTF of the lens module shown in fig. 4;

fig. 6 is a graph illustrating aberration characteristics of the lens module shown in fig. 4;

fig. 7 is a structural diagram of a lens module according to a third exemplary embodiment of the present disclosure;

fig. 8 is a graph illustrating MTF of the lens module shown in fig. 7;

fig. 9 is a graph illustrating aberration characteristics of the lens module shown in fig. 7;

fig. 10 is a structural view of a lens module according to a fourth exemplary embodiment of the present disclosure;

fig. 11 is a graph illustrating MTF of the lens module shown in fig. 10;

fig. 12 is a graph illustrating aberration characteristics of the lens module shown in fig. 10;

fig. 13 is a structural view of a lens module according to a fifth exemplary embodiment of the present disclosure;

fig. 14 is a graph illustrating MTF of the lens module shown in fig. 13;

fig. 15 is a graph illustrating aberration characteristics of the lens module shown in fig. 13;

fig. 16 is a structural view of a lens module according to a sixth exemplary embodiment of the present disclosure;

fig. 17 is a graph illustrating MTF of the lens module shown in fig. 16;

fig. 18 is a graph illustrating aberration characteristics of the lens module shown in fig. 16;

fig. 19 is a structural view of a lens module according to a seventh exemplary embodiment of the present disclosure;

fig. 20 is a graph illustrating MTF of the lens module shown in fig. 19;

fig. 21 is a graph illustrating aberration characteristics of the lens module illustrated in fig. 19.

Detailed Description

Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, the described embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated. In the drawings, the shapes and sizes of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or similar elements. It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. As used in the specification and in the claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In the present exemplary embodiment, the first lens refers to a lens closest to the object side, and the seventh lens refers to a lens closest to the image side. In addition, the term "front" refers to a direction from the lens module toward the object side, and the term "rear" refers to a direction from the lens module toward the image sensor or the image side. In addition, the first surface of each lens refers to a surface close to the object side (or object side surface), and the second surface of each lens refers to a surface close to the image side (or image side surface). In addition, unless otherwise specifically described, in the present exemplary embodiment, the units of the radius of curvature, the thickness, TTL, BFL, the focal length of the lens (e.g., f1, f2, f3, f4, f5, f6, f7, and f12) may all be mm. In addition, the thickness of the lenses, the spacing between lenses, TTL (or OAL), SL and BFL are distances measured along the optical axis of the lenses. In addition, in the description of the shape of the lens, the one surface of the lens being convex means that the optical axis portion of the corresponding surface is convex, and the one surface of the lens being concave means that the optical axis portion of the corresponding surface is concave. Therefore, even if the lens is described as having one surface of the lens being convex, the peripheral portion of the lens may be concave. Conversely, even if the lens is described as having one surface of the lens being concave, the peripheral portion of the lens may be convex. In addition, in the following description, the term "inflection point" refers to a point at which the radius of curvature changes at a portion that does not cross the optical axis. In addition, in the following description, the term "turning point" refers to a point that is convex or concave in a portion that does not cross the optical axis.

Fig. 1 is a structural diagram of a lens module according to a first exemplary embodiment of the present disclosure, fig. 2 is a graph showing a Modulation Transfer Function (MTF) of the lens module shown in fig. 1, fig. 3 is a graph showing an aberration characteristic of the lens module shown in fig. 1, fig. 4 is a structural diagram of a lens module according to a second exemplary embodiment of the present disclosure, fig. 5 is a graph showing an MTF of the lens module shown in fig. 4, fig. 6 is a graph showing an aberration characteristic of the lens module shown in fig. 4, fig. 7 is a structural diagram of a lens module according to a third exemplary embodiment of the present disclosure, fig. 8 is a graph showing an MTF of the lens module shown in fig. 7, fig. 9 is a graph showing an aberration characteristic of the lens module shown in fig. 7, fig. 10 is a structural diagram of a lens module according to a fourth exemplary embodiment of the present disclosure, fig. 11 is a graph showing MTF of the lens module shown in fig. 10, fig. 12 is a graph showing aberration characteristics of the lens module shown in fig. 10, fig. 13 is a structural view of a lens module according to a fifth exemplary embodiment of the present disclosure, fig. 14 is a graph illustrating MTF of the lens module shown in fig. 13, fig. 15 is a graph illustrating aberration characteristics of the lens module shown in fig. 13, fig. 16 is a structural view of the lens module according to a sixth exemplary embodiment of the present disclosure, fig. 17 is a graph showing MTF of the lens module shown in fig. 16, fig. 18 is a graph showing aberration characteristics of the lens module shown in fig. 16, fig. 19 is a structural diagram of a lens module according to a seventh exemplary embodiment of the present disclosure, fig. 20 is a graph illustrating MTF of the lens module shown in fig. 19, and fig. 21 is a graph illustrating aberration characteristics of the lens module shown in fig. 19.

A lens module according to the present disclosure may include an optical system including seven lenses sequentially from an object side to an image side. The lens module may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. However, the lens module may further include other components or additional one or more lenses, if necessary. For example, the lens module may include a diaphragm for controlling the amount of light. In addition, the lens module may further include an infrared ray cut filter blocking the infrared ray. In addition, the lens module may include an image sensor (i.e., an imaging device) for converting an image of an object incident through the optical system into an electrical signal or data. The lens module may further include a space maintaining member that adjusts a space between the lenses. In addition to the seven lenses, one or more lenses may be disposed in front of the first lens, behind the seventh lens, or between the first and seventh lenses.

At least one of the first to seventh lenses may be formed of plastic. For example, the first lens and the seventh lens may be formed of plastic, and the other lenses may be formed of different materials. However, the materials of the first to seventh lenses are not limited to the above materials. For example, all of the first to seventh lenses may be formed of plastic.

At least one of the object side surface and the image side surface of at least one of the first lens to the seventh lens may be an aspherical surface. For example, the object side surface or the image side surface of the first lens to the seventh lens may be an aspherical surface. As another example, both surfaces (the object side surface and the image side surface) of the first lens to the seventh lens may be aspherical surfaces. The aspherical surface of each lens can be represented by equation 1.

[ equation 1]

In equation 1, Z represents the height of a tangent plane to the vertex of the aspherical surface at a point on the aspherical surface spaced from the optical axis by a distance Y, c represents the curvature (1/r), K represents a conic constant, and Y represents the distance from the point on the curve of the aspherical surface to the optical axis. The constants a to J sequentially represent 4 th to 20 th order aspherical coefficients.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 1:

[ Condition 1]

1.0<f12/f<2.1

Here, f12 is a composite focal length (mm) of the first lens and the second lens, and f is a total focal length of the optical system (i.e., a total focal length of the lens module) [ mm ].

Here, the conditional expression 1 may be a numerical range for optimizing the refractive powers of the first lens and the second lens. For example, in the case where the value of f12/f is lower than the lower limit value of conditional expression 1, the refractive power becomes large, so that it may be difficult to correct spherical aberration. In contrast, in the case where the value of f12/f is higher than the upper limit value of conditional expression 1, the lens module may be advantageous in correcting aberrations, but it may be difficult to miniaturize the optical system.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 2:

[ Condition 2]

TTL/f<1.40

Here, TTL is a distance [ mm ] from the object side surface of the first lens to the image plane, and f is an overall focal length [ mm ] of the optical system.

The conditional expression 2 may be a numerical range for miniaturizing the lens module. For example, if the value of TTL/f is higher than the upper limit value of conditional expression 2, it may be difficult to miniaturize the optical system.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 3:

[ Condition 3]

BFL/f>0.2

Here, BFL is a distance [ mm ] from an image side surface of the seventh lens to an image plane, and f is an overall focal length [ mm ] of the optical system.

The conditional expression 3 may be a numerical range for optimizing manufacturing convenience of the lens module. For example, in the case where the value of BFL/f is lower than the lower limit value of conditional expression 3, the distance between the seventh lens and the image plane may not be ensured, and it may be difficult to actually manufacture the lens module.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 4:

[ Condition 4]

R1/f>0.35

Here, R1 is a radius of curvature [ mm ] of the object side surface of the first lens, and f is an overall focal length [ mm ] of the optical system.

Conditional expression 4 may be a numerical range for optimizing the first lens. For example, in the case where the value of R1/f is lower than the lower limit value of conditional expression 4, the radius of curvature may be excessively small, the first lens may be sensitive to manufacturing tolerances, and the first lens may not be easily manufactured.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 5:

[ Condition 5]

-0.6<(R11-R12)/(R11+R12)<8.0

Here, R11 is a radius of curvature [ mm ] of the object side surface of the sixth lens, and R12 is a radius of curvature [ mm ] of the image side surface of the sixth lens.

The conditional expression 5 may be a numerical range for optimizing the shape of the sixth lens. For example, in the case where the value of (R11-R12)/(R11+ R12) exceeds the numerical range of conditional expression 5, the deviation between the radius of curvature of the object side surface and the radius of curvature of the image side surface of the sixth lens becomes large, and the sixth lens may be disadvantageous in correcting aberrations.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 6:

[ Condition 6]

-2.0<R13/f<1.0

Here, R13 is a radius of curvature [ mm ] of the object side surface of the seventh lens.

Conditional expression 6 may be a numerical range for optimizing the shape of the seventh lens, for example, in the case where the value of R13/f exceeds the numerical range of conditional expression 6, it may be difficult to manufacture the seventh lens, and the effect of correcting aberrations may be reduced.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 7:

[ Condition 7]

-10.0<(R5-R6)/(R5+R6)<14.0

Here, R5 is a radius of curvature [ mm ] of the object side surface of the third lens, and R6 is a radius of curvature [ mm ] of the image side surface of the third lens.

For example, in the case where the value of (R5-R6)/(R5+ R6) is out of the numerical range of conditional expression 7, the deviation between the radius of curvature of the object side surface and the radius of curvature of the image side surface of the third lens becomes large, and the third lens may be disadvantageous in correcting aberrations.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 8:

[ Condition 8]

ANG/f>15.0

Here, ANG is an angle of view [ mm ] of the lens module, and f is a total focal length [ mm ] of the optical system including the first to seventh lenses.

For example, in the case where the value of ANG/f is lower than the lower limit value of conditional expression 8, the lens module may be disadvantageous in providing a wide angle of view.

In a lens module according to an exemplary embodiment of the present disclosure, an optical system including first to seventh lenses may satisfy conditional expression 9:

[ Condition 9]

|f1|<|f3|

Here, f1 is the focal length [ mm ] of the first lens, and f3 is the focal length [ mm ] of the third lens.

Hereinafter, the first to seventh lenses of the lens module according to the exemplary embodiment of the present disclosure will be described in detail.

The first lens may have an optical power. For example, the optical power of the first lens may be positive. The first lens may be formed of plastic. However, the material of the first lens is not limited to plastic. For example, different materials that can transmit light can be used to fabricate the first lens. The first surface of the first lens may be convex, and the second surface thereof may be concave. For example, the first lens may have a meniscus shape convex toward the object side or a plano-convex shape with one surface thereof convex. However, the shape of the first lens is not limited to the above shape. For example, the second surface of the first lens may be convex if desired. At least one of the first surface and the second surface of the first lens may be an aspherical surface. For example, the first surface or the second surface of the first lens may be aspherical, or both surfaces of the first lens may be aspherical.

The second lens may have an optical power. For example, the optical power of the second lens may be positive or negative. The second lens may be formed of plastic. However, the material of the second lens is not limited to plastic. For example, different materials that can transmit light may be used to fabricate the second lens. The first surface of the second lens may be convex, and the second surface thereof may be concave. For example, the second lens may have a meniscus shape convex toward the object side. However, the shape of the second lens is not limited to the above shape. For example, the first surface of the second lens may be concave if desired. At least one of the first surface and the second surface of the second lens may be an aspherical surface. For example, the first surface or the second surface of the second lens may be aspherical, or both surfaces of the second lens may be aspherical.

The third lens may have an optical power. For example, the optical power of the third lens may be positive or negative. The third lens may be formed of plastic. However, the material of the third lens is not limited to plastic. For example, different materials that can transmit light may be used to fabricate the third lens. Both surfaces of the third lens may be convex. However, the shape of the third lens is not limited to the above shape. For example, the third lens may have a shape in which an optical axis portion of an object side surface thereof is convex and a peripheral portion of the object side surface thereof is concave. In addition, the second surface of the third lens may be concave. At least one of the first surface and the second surface of the third lens may be an aspherical surface. For example, the first surface or the second surface of the third lens may be aspherical, or both surfaces of the third lens may be aspherical.

The fourth lens may have an optical power. For example, the optical power of the fourth lens may be positive or negative. The fourth lens may be formed of plastic. However, the material of the fourth lens is not limited to plastic. For example, different materials that can transmit light may be used to fabricate the fourth lens. The first surface of the fourth lens may have a concave shape and the second surface thereof may have a convex shape. For example, the fourth lens may have a meniscus shape convex toward the image side. However, the shape of the fourth lens is not limited to the above shape. The fourth lens may have various shapes, for example, a first surface of the fourth lens is convex, and a second surface thereof is concave. At least one of the first surface and the second surface of the fourth lens may be an aspherical surface. For example, the first surface or the second surface of the fourth lens may be aspherical, or both surfaces of the fourth lens may be aspherical.

The fifth lens may have an optical power. For example, the optical power of the fifth lens may be positive or negative. The fifth lens may be formed of plastic. However, the material of the fifth lens is not limited to plastic. For example, a different material that can transmit light may be used to fabricate the fifth lens. The first surface of the fifth lens may be concave, and the second surface thereof may be convex. For example, the fifth lens may have a meniscus shape convex toward the image side. At least one of the first surface and the second surface of the fifth lens may be an aspherical surface. For example, the first surface or the second surface of the fifth lens may be an aspherical surface, or both surfaces of the fifth lens may be aspherical surfaces.

The sixth lens may have an optical power. For example, the refractive power of the sixth lens may be positive or negative. The sixth lens may be formed of plastic. However, the material of the sixth lens is not limited to plastic. For example, a different material that can transmit light may be used to fabricate the sixth lens. The first surface of the sixth lens may be convex, and the second surface thereof may be concave. However, the shape of the sixth lens is not limited to the above shape. The sixth lens may have various shapes, for example, a first surface of the sixth lens may be concave, and a second surface thereof may be convex. In addition, the sixth lens may have a shape in which an inflection point is formed on at least one of the first and second surfaces thereof. At least one of the first surface and the second surface of the sixth lens may be an aspherical surface, or both surfaces of the sixth lens may be aspherical surfaces.

The seventh lens may have an optical power. For example, the refractive power of the seventh lens may be negative. The seventh lens may be formed of plastic. However, the material of the seventh lens is not limited to plastic. For example, a different material that can transmit light may be used to fabricate the seventh lens. The first surface of the seventh lens may be convex, and the second surface thereof may be concave. However, the shape of the seventh lens is not limited to the above shape. The seventh lens may have various shapes, for example, both surfaces of the seventh lens are concave. The seventh lens may have a shape forming an inflection point on at least one of the first and second surfaces thereof. For example, the second surface of the seventh lens may be concave at the center of the optical axis and become convex toward the edge of the second surface of the seventh lens. In addition, one or more inflection points may be formed on at least one of the object-side surface and the image-side surface of the seventh lens. At least one of the first surface and the second surface of the seventh lens may be an aspherical surface, or both surfaces of the seventh lens may be aspherical surfaces.

Some embodiments of the lens module configured as described above may reduce aberrations that degrade image quality. In addition, some embodiments of the lens module configured as described above may improve the lightening and reduce the manufacturing cost.

Hereinafter, the lens modules according to the first to seventh exemplary embodiments of the present disclosure will be described.

First, a lens module according to a first exemplary embodiment (example 1) of the present disclosure will be described with reference to fig. 1 to 3.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.543mm, the focal length of the first lens 10 may be 4.199mm, the focal length of the second lens 20 may be-9.17 mm, the focal length of the third lens 30 may be 4.903mm, the focal length of the fourth lens 40 may be-6.400 mm, the focal length of the fifth lens 50 may be-124.921 mm, the focal length of the sixth lens 60 may be 27.141mm, and the focal length of the seventh lens 70 may be-14.863 mm.

Table 1 below shows the radius of curvature of the lens, the thickness of the lens or the distance between the lenses, the refractive index of the lens, and the abbe number of the lens. More specifically, the value in the horizontal line corresponding to 1 in the vertical column sequentially indicates the radius of curvature R1 of the first surface of the first lens 10, the thickness of the first lens 10, the refractive index of the first lens 10, and the abbe number of the first lens 10. In addition, the value in the horizontal line corresponding to 2 in the vertical column sequentially indicates the radius of curvature R2 of the second surface of the first lens 10, the distance between the first lens 10 and the second lens 20. Similarly, a value in a horizontal line corresponding to 3 in the vertical column sequentially indicates the radius of curvature R3 of the first surface of the second lens 20, the thickness of the second lens 20, the refractive index of the second lens 20, and the abbe number of the second lens 20. In addition, the value in the horizontal line corresponding to 4 in the vertical column indicates the radius of curvature R4 of the second surface of the second lens 20, the distance between the second lens 20 and the third lens 30 in order. For ease of reference, the radii of curvature R5 to R14 of the third to seventh lenses, the thicknesses of the third to seventh lenses or the distance between the third to seventh lenses, the refractive indices of the third to seventh lenses, and the abbe numbers of the third to seventh lenses are shown in the same scheme as that described above.

Table 2 below shows the aspherical coefficients of each lens. Specifically, the first horizontal row in table 2 indicates the first and second surfaces of each lens. For example, the number 2 in the first horizontal line indicates the first surface of the first lens 10, and the number 3 in the first horizontal line indicates the second surface of the first lens 10. Further, numeral 4 in the first horizontal line denotes a first surface of the second lens 20, and numeral 5 in the first horizontal line denotes a second surface of the second lens 20. Similarly, reference numerals 6 to 15 in the first horizontal line denote first and second surfaces of the third to seventh lenses 30 to 70, respectively.

In the present exemplary embodiment, the first lens 10 may have a positive refractive power. The first surface of the first lens 10 may be convex and the second surface thereof may be concave. The second lens 20 may have a negative refractive power. The first surface of the second lens 20 may be convex and the second surface thereof may be concave. The third lens 30 may have a positive refractive power. Both surfaces of the third lens 3 may be convex. The fourth lens 40 may have a negative refractive power. The first surface of the fourth lens 40 may be concave and the second surface thereof may be convex. That is, the fourth lens 40 may have a meniscus shape convex toward the image side. The fifth lens 50 may have a negative refractive power. The first surface of the fifth lens 50 may be concave and the second surface thereof may be convex. That is, the fifth lens 50 may have a meniscus shape convex toward the image side. The sixth lens 60 may have a positive refractive power. In addition, the first surface of the sixth lens 60 may be convex and the second surface thereof may be concave. The sixth lens 60 may have inflection points formed on the first and second surfaces thereof, respectively. The seventh lens 70 may have a negative refractive power. The first surface of the seventh lens 70 may be convex and the second surface thereof may be concave. In addition, the seventh lens 70 may have an inflection point formed on the second surface thereof.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 2 and aberration characteristics as shown in fig. 3, respectively.

[ Table 1]

Example 1	Radius of curvature	Thickness/distance	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.050
					1	1.8598	0.518	1.544	56.1
2	9.0224	0.105
					3	3.9767	0.220	1.635	24.0
4	2.3118	0.327
					5	6.3324	0.470	1.544	56.1
6	-4.4884	0.341
					7	-1.2726	0.220	1.635	24.0
8	-1.9772	0.162
					9	-1.5843	0.220	1.544	56.1
10	-1.7015	0.100
					11	2.6609	0.519	1.635	24.0
12	2.9085	0.371
					13	2.34792	0.641	1.544	56.1
14	1.64465	0.438
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.503
					Image

[ Table 2]

A lens module according to a second exemplary embodiment (example 2) of the present disclosure will be described with reference to fig. 4 to 6.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.462mm, the focal length of the first lens 10 may be 3.742mm, the focal length of the second lens 20 may be-7.998 mm, the focal length of the third lens 30 may be 5.553mm, the focal length of the fourth lens 40 may be-8.276 mm, the focal length of the fifth lens 50 may be 104.962mm, the focal length of the sixth lens 60 may be 517.567mm, and the focal length of the seventh lens 70 may be-12.343 mm.

Table 3 below shows the radius of curvature of the lenses, the thickness of the lenses or the distance between the lenses, the refractive index of the lenses, and the abbe number of the lenses. Table 4 below shows the aspherical coefficients of each surface of each lens.

In the present exemplary embodiment, the first lens 10 may have a positive refractive power. The first surface of the first lens 10 may be convex and the second surface thereof may be concave. The second lens 20 may have a negative refractive power. The first surface of the second lens 20 may be convex and the second surface thereof may be concave. The third lens 30 may have a positive refractive power. Both surfaces of the third lens 3 may be convex. The fourth lens 40 may have a negative refractive power. The first surface of the fourth lens 40 may be concave and the second surface thereof may be convex. That is, the fourth lens 40 may have a meniscus shape convex toward the image side. The fifth lens 50 may have a positive refractive power. The first surface of the fifth lens 50 may be concave and the second surface thereof may be convex. That is, the fifth lens 50 may have a meniscus shape convex toward the image side. The sixth lens 60 may have a positive refractive power. The first surface of the sixth lens 60 may be convex and the second surface thereof may be concave. In addition, the sixth lens 60 may have inflection points formed on the first and second surfaces thereof, respectively. The seventh lens 70 may have a negative refractive power. The first surface of the seventh lens 70 may be convex and the second surface thereof may be concave. In addition, the seventh lens 70 may have an inflection point formed on the second surface thereof.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 5 and aberration characteristics as shown in fig. 6, respectively.

[ Table 3]

Example 2	Radius of curvature	Thickness/distance	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.050
					1	1.823	0.592	1.544	56.1
2	15.421	0.100
					3	4.172	0.220	1.635	24.0
4	2.244	0.375
					5	7.162	0.467	1.544	56.1
6	-5.106	0.336
					7	-1.312	0.240	1.635	24.0
8	-1.872	0.158
					9	-1.566	0.242	1.544	56.1
10	-1.607	0.100
					11	2.899	0.497	1.635	24.0
12	2.731	0.290
					13	3.143	0.724	1.544	56.1
14	1.967	0.265
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.501
					Image

[ Table 4]

A lens module according to a third exemplary embodiment (example 3) of the present disclosure will be described with reference to fig. 7 to 9.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.271mm, the focal length of the first lens 10 may be 3.782mm, the focal length of the second lens 20 may be-7.960 mm, the focal length of the third lens 30 may be 5.239mm, the focal length of the fourth lens 40 may be-6.790 mm, the focal length of the fifth lens 50 may be 53.775mm, the focal length of the sixth lens 60 may be 72.888mm, and the focal length of the seventh lens 70 may be-15.543 mm.

Table 5 below shows the radius of curvature of the lenses, the thickness of the lenses or the distance between the lenses, the refractive index of the lenses, and the abbe number of the lenses. Table 6 below shows aspheric coefficients of each surface of each lens.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 8 and aberration characteristics as shown in fig. 9, respectively.

[ Table 5]

Example 3	Radius of curvature	Thickness/distance	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.050.
					1	1.802	0.540	1.544	56.1
2	13.001	0.104
					3	4.169	0.242	1.635	24.0
4	2.233	0.301
					5	6.476	0.398	1.544	56.1
6	-4.982	0.347
					7	-1.252	0.240	1.635	24.0
8	-1.895	0.164
					9	-1.547	0.242	1.544	56.1
10	-1.551	0.100
					11	2.535	0.554	1.635	24.0
12	2.455	0.281
					13	2.075	0.537	1.544	56.1
14	1.514	0.252
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.600
					Image

[ Table 6]

A lens module according to a fourth exemplary embodiment (example 4) of the present disclosure will be described with reference to fig. 10 to 12.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.300mm, the focal length of the first lens 10 may be 5.204mm, the focal length of the second lens 20 may be 1000.000mm, the focal length of the third lens 30 may be 4.026mm, the focal length of the fourth lens 40 may be-4.520 mm, the focal length of the fifth lens 50 may be 7.456mm, the focal length of the sixth lens 60 may be-31.268 mm, and the focal length of the seventh lens 70 may be-5.024 mm.

Table 7 below shows the radius of curvature of the lenses, the thickness of the lenses or the distance between the lenses, the refractive index of the lenses, and the abbe number of the lenses. Table 8 below shows aspherical coefficients of each surface of each lens.

In the present exemplary embodiment, the first lens 10 may have a positive refractive power. The first surface of the first lens 10 may be convex and the second surface thereof may be concave. The second lens 20 may have a positive refractive power. The first surface of the second lens 20 may be convex and the second surface thereof may be concave. The third lens 30 may have a positive refractive power. Both surfaces of the third lens 3 may be convex. The fourth lens 40 may have a negative refractive power. The first surface of the fourth lens 40 may be concave and the second surface thereof may be convex. That is, the fourth lens 40 may have a meniscus shape convex toward the image side. The fifth lens 50 may have a positive refractive power. The first surface of the fifth lens 50 may be concave and the second surface thereof may be convex. That is, the fifth lens 50 may have a meniscus shape convex toward the image side. The sixth lens 60 may have a negative refractive power. The first surface of the sixth lens 60 may be convex and the second surface thereof may be concave. In addition, the sixth lens 60 may have inflection points formed on the first and second surfaces thereof, respectively. The seventh lens 70 may have a negative refractive power. The first surface of the seventh lens 70 may be concave and the second surface thereof may be concave. In addition, the seventh lens 70 may have an inflection point formed on the second surface thereof.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 11 and aberration characteristics as shown in fig. 12, respectively.

[ Table 7]

Example 4	Radius of curvature	Thickness/distance	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.050
					1	1.946	0.426	1.544	56.1
2	5.740	0.102
					3	5.025	0.250	1.635	24.0
4	4.968	0.222
					5	16.021	0.471	1.544	56.1
6	-2.312	0.188
					7	-1.396	0.570	1.635	24.0
8	-3.150	0.174
					9	-1.832	0.340	1.544	56.1
10	-1.344	0.100
					11	3.272	0.576	1.635	24.0
12	2.617	0.590
					13	-5.948	0.501	1.544	56.1
14	5.208	0.139
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.489
					Image

[ Table 8]

A lens module according to a fifth exemplary embodiment (example 5) of the present disclosure will be described with reference to fig. 13 to 15.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.522mm, the focal length of the first lens 10 may be 4.584mm, the focal length of the second lens 20 may be-8.221 mm, the focal length of the third lens 30 may be 6.410mm, the focal length of the fourth lens 40 may be 73.896mm, the focal length of the fifth lens 50 may be 17.417mm, the focal length of the sixth lens 60 may be-12.539 mm, and the focal length of the seventh lens 70 may be-6.829 mm.

Table 9 below shows the radius of curvature of the lenses, the thickness of the lenses or the distance between the lenses, the refractive index of the lenses, and the abbe number of the lenses. Table 10 below shows aspheric coefficients of each surface of each lens.

In the present exemplary embodiment, the first lens 10 may have a positive refractive power. The first surface of the first lens 10 may be convex and the second surface thereof may be concave. The second lens 20 may have a negative refractive power. The first surface of the second lens 20 may be convex and the second surface thereof may be concave. The third lens 30 may have a positive refractive power. Both surfaces of the third lens 3 may be convex. The fourth lens 40 may have a positive refractive power. The first surface of the fourth lens 40 may be concave and the second surface thereof may be convex. That is, the fourth lens 40 may have a meniscus shape convex toward the image side. The fifth lens 50 may have a positive refractive power. The first surface of the fifth lens 50 may be concave and the second surface thereof may be convex. That is, the fifth lens 50 may have a meniscus shape convex toward the image side. The sixth lens 60 may have a negative refractive power. The first surface of the sixth lens 60 may be convex and the second surface thereof may be concave. In addition, the sixth lens 60 may have inflection points formed on the first and second surfaces thereof, respectively. The seventh lens 70 may have a negative refractive power. The first surface of the seventh lens 70 may be convex and the second surface thereof may be concave. In addition, the seventh lens 70 may have an inflection point formed on the second surface thereof.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 14 and aberration characteristics as shown in fig. 15, respectively.

[ Table 9]

Example 5	Radius of curvature	Distance of thickness	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.050
					1	2.004.	0.440	1.544	56.1
2	9.413	0.102
					3	5.035	0.220	1.635	24.0
4	2.520	0.305
					5	4.272	0.481	1.544	56.1
6	-18.245	0.322
					7	-2.96.4	0.262	1.635	24.0
8	-2.883	0.125
					9	-2.34.8	0.329	1.544	56.1
10	-1.975	0.150
					11	5.085	0.581	1.635	24.0
12	2.965	0.516
					13	2.794	0.500	1.544	56.1
14	1.494	0.317
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.503
					Image

[ Table 10]

A lens module according to a sixth exemplary embodiment (example 6) of the present disclosure will be described with reference to fig. 16 to 18.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.165mm, the focal length of the first lens 10 may be 3.794mm, the focal length of the second lens 20 may be-8.619 mm, the focal length of the third lens 30 may be-341.847 mm, the focal length of the fourth lens 40 may be 96.237mm, the focal length of the fifth lens 50 may be 3.198mm, the focal length of the sixth lens 60 may be-11.131 mm, and the focal length of the seventh lens 70 may be-4.635 mm.

Table 11 below shows the radius of curvature of the lenses, the thickness of the lenses or the distance between the lenses, the refractive index of the lenses, and the abbe number of the lenses. Table 12 below shows aspheric coefficients of each surface of each lens.

In the present exemplary embodiment, the first lens 10 may have a positive refractive power. Both of the first lenses 10 may have a convex shape. The second lens 20 may have a negative refractive power. Both surfaces of the second lens 20 may be concave. The third lens 30 may have a negative refractive power. The first surface of the third lens 3 may be convex and the second surface thereof may be concave. The fourth lens 40 may have a positive refractive power. The first surface of the fourth lens 40 may be convex and the second surface thereof may be concave. The fifth lens 50 may have a positive refractive power. The first surface of the fifth lens 50 may be concave and the second surface thereof may be convex. That is, the fifth lens 50 may have a meniscus shape convex toward the image side. The sixth lens 60 may have a negative refractive power. The first surface of the sixth lens 60 may be concave and the second surface thereof may be convex. The seventh lens 70 may have a negative refractive power. The first surface of the seventh lens 70 may be convex and the second surface thereof may be concave. In addition, the seventh lens 70 may have an inflection point formed on the second surface thereof.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 17 and aberration characteristics as shown in fig. 18, respectively.

[ Table 11]

Example 6	Radius of curvature	Thickness/distance	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.050
					1	2.143	0.439	1.544	56.1
2	-51.915	0.111
					3	-52.701	0.224	1.635	24.0
4	6.117	0.345
					5	4.745	0.289	1.544	56.1
6	4.527	0.196
					7	6.434	0.310	1.635	24.0
8	7.057	0.252
					9	-4.163	0.578	1.544	56.1
10	-1.287	0.194
					11	-1.752	0.300	1.635	24.0
12	-2.448	0.221
					13	2.768	0.664	1.544	56.1
14	1.208	0.489
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.515
					Image

[ Table 12]

A lens module according to a seventh exemplary embodiment (example 7) of the present disclosure will be described with reference to fig. 19 to 21.

The lens module 100 according to the present exemplary embodiment may include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70. The lens module 100 may further include an infrared cut filter 80 and an image sensor 90. In addition, the lens module 100 may include at least one aperture stop (not shown). An aperture stop (not shown) may be provided in front of the first lens 10, or at any position between the first lens 10 to the seventh lens 70. For reference, the total focal length f of the lens module 100 may be 4.000mm, the focal length of the first lens 10 may be 3.907mm, the focal length of the second lens 20 may be-9.478 mm, the focal length of the third lens 30 may be-415.933 mm, the focal length of the fourth lens 40 may be 986.711mm, the focal length of the fifth lens 50 may be 3.042mm, the focal length of the sixth lens 60 may be-10.825 mm, and the focal length of the seventh lens 70 may be-4.979 mm.

Table 13 below shows the radius of curvature of the lenses, the thickness of the lenses or the distance between the lenses, the refractive index of the lenses, and the abbe number of the lenses. Table 14 below shows the aspherical coefficients of each surface of each lens.

The lens module of the exemplary embodiment configured as described above may have MTF characteristics as shown in fig. 20 and aberration characteristics as shown in fig. 21, respectively.

[ Table 13]

Example 7	Radius of curvature	Thickness/distance	Refractive index	Abbe number
					Article (A)	Infinity(s)	Infinity(s)
ST	Infinity(s)	0.05
					1	2.158	0.415	1.544	56.1
2	-135.165	0.100
					3	-252.549	0.220	1.635	24.0
4	6.167	0.372
					5	5.119	0.298	1.544	56.1
6	4.903	0.165
					7	7.230	0.313	1.635	24.0
8	7.191	0.238
					9	-4.289	0.634	1.544	56.1
10	-1.256	0.100
					11	-1.725	0.221	1.635	24.0
12	-2.419	0.221
					13	2.586	0.744	1.544	56.1
14	1.189	0.527
					15	Infinity(s)	0.300	1.517	64.2
16	Infinity(s)	0.515
					Image

[ Table 14]

The lens modules according to the first to seventh exemplary embodiments of the present disclosure configured as described above may satisfy conditional expressions 1 to 8 as shown in table 15, and may improve optical performance of the lens.

[ Table 15 ]

Reference numerals	Conditional formula (II)	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7
									1	1.0<f12/f<2.1	1.455	1.318	1.405	1.181	1.906	1.472	1.526
2	TTL/f<1.40	1.211	1.223	1.229	1.279	1.216	1.318	1.362
									3	BFL/f>0.2	0.272	0.239	0.270	0.218	0.247	0.317	0.339
4	R1/f>0.35	0.409	0.409	0.422	0.452	0.443	0.515	0.539
									5	-0.6<(R11-R12)/(R11+R12)<8.0	-0.044	0.030	0.016	0.112	0.263	-0.171	-0.168
6	-2.0<R13/f<1.0	0.517	0.704	0.486	-1.383	0.618	0.665	0.647
									7	-10.0<(R5-R6)/(R5+R6)<14.0	5.868	5.966	7.673	1.372	-1.611	0.023	0.022

8

ANG/f>15.0

16.101

15.258

16.438

17.715

16.264

18.647

20.350

As described above, according to the exemplary embodiments of the present disclosure, aberrations can be easily corrected and high resolution can be achieved.

While exemplary embodiments have been shown and described above, it will be apparent to those of ordinary skill in the art that modifications and changes may be made thereto without departing from the spirit and scope of the disclosure as defined by the claims. The illustrative discussions above are not intended to be exhaustive or to limit the invention to the precise forms disclosed.

Claims

1. A lens module, comprising in order from an object side to an image side:

a first lens having a positive refractive power;

a second lens having refractive power;

a third lens having a positive refractive power;

a fourth lens having refractive power;

a fifth lens having refractive power;

a sixth lens having negative refractive power;

a seventh lens having a negative refractive power, an image side surface of the seventh lens having one or more inflection points.

2. The lens module as claimed in claim 1, wherein the second lens has a negative refractive power.

3. The lens module as claimed in claim 1, wherein the fourth lens has a negative refractive power.

4. The lens module as claimed in claim 1, wherein the fourth lens has a positive refractive power.

5. The lens module of claim 1, wherein the object side surface of the first lens is convex and the image side surface of the first lens is concave.

6. The lens module of claim 1, wherein an object side surface of the second lens is convex and an image side surface of the second lens is concave.

7. The lens module as claimed in claim 1, wherein both surfaces of the third lens are convex.

8. The lens module of claim 1, wherein an object side surface of the fourth lens is concave and an image side surface of the fourth lens is convex.

9. The lens module of claim 1, wherein an object side surface of the fifth lens is concave and an image side surface of the fifth lens is convex.

10. The lens module of claim 1, wherein an object side surface of the sixth lens is concave and an image side surface of the sixth lens is convex.

11. The lens module of claim 1, wherein an object side surface of the seventh lens is convex and an image side surface of the seventh lens is concave.

12. The lens module of claim 1, wherein one or more inflection points are formed on at least one of an object-side surface and an image-side surface of the sixth lens.

13. The lens module of claim 1, wherein one or more inflection points are formed on at least one of an object-side surface and an image-side surface of the seventh lens.

14. The lens module according to claim 1, wherein at least one of the first to seventh lenses is formed of plastic.

15. The lens module according to claim 1, wherein at least one of an object side surface and an image side surface of at least one of the first lens to the seventh lens is an aspherical surface.

16. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional expression ]1.0< f12/f <2.1

Where f12 is a composite focal length of the first lens and the second lens, and f is a total focal length of the optical system configured by the first lens to the seventh lens.

17. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] TTL/f <1.40

Where TTL is a distance from the object side surface of the first lens to the image plane, and f is a total focal length of the optical system configured by the first lens to the seventh lens.

18. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] BFL/f >0.2

Where BFL is a distance from the image side surface of the seventh lens to the image plane, and f is a total focal length of the optical system configured by the first lens to the seventh lens.

19. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] R1/f >0.35

Where R1 is a radius of curvature of the object side surface of the first lens, and f is an overall focal length of the optical system constructed by the first lens to the seventh lens.

20. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -0.6< (R11-R12)/(R11+ R12) <8.0

Where R11 is a radius of curvature of the object side surface of the sixth lens, and R12 is a radius of curvature of the image side surface of the sixth lens.

21. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -2.0< R13/f <1.0

Where R13 is a radius of curvature of the object side surface of the seventh lens, and f is an overall focal length of the optical system constructed by the first lens to the seventh lens.

22. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -10.0< (R5-R6)/(R5+ R6) <14.0

Where R5 is a radius of curvature of the object side surface of the third lens, and R6 is a radius of curvature of the image side surface of the third lens.

23. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

(conditional) ANG/f >15.0

Where ANG is an angle of view of the lens module, and f is a total focal length of an optical system configured by the first to seventh lenses.

24. The lens module according to claim 1, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] | f1| < | f3| ventilation

Where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

25. A lens module, comprising in order from an object side to an image side:

a first lens having a positive refractive power;

a second lens having a positive refractive power;

a third lens having a positive refractive power;

a fourth lens having refractive power;

a fifth lens having refractive power;

a sixth lens having negative refractive power;

26. The lens module as recited in claim 25, wherein the fourth lens has a negative refractive power.

27. The lens module as claimed in claim 25, wherein the fifth lens has a positive refractive power.

28. The lens module as recited in claim 25, wherein an object side surface of the first lens is convex and an image side surface of the first lens is concave.

29. The lens module of claim 25, wherein the object side surface of the second lens is convex and the image side surface of the second lens is concave.

30. The lens module as recited in claim 25, wherein both surfaces of the third lens are convex.

31. The lens module as recited in claim 25, wherein an object side surface of the fourth lens is concave and an image side surface of the fourth lens is convex.

32. The lens module as recited in claim 25, wherein an object side surface of the fifth lens is concave and an image side surface of the fifth lens is convex.

33. The lens module as recited in claim 25, wherein an object side surface of the sixth lens is concave and an image side surface of the sixth lens is convex.

34. The lens module of claim 25, wherein an object side surface of the seventh lens is concave and an image side surface of the seventh lens is concave.

35. The lens module of claim 25, wherein one or more inflection points are formed on at least one of an object-side surface and an image-side surface of the sixth lens.

36. The lens module of claim 25, wherein one or more inflection points are formed on at least one of an object-side surface and an image-side surface of the seventh lens.

37. The lens module as recited in claim 25, wherein at least one of an object side surface and an image side surface of at least one of the first to seventh lenses is an aspherical surface.

38. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional expression ]1.0< f12/f <2.1

39. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] TTL/f <1.40

40. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] BFL/f >0.2

41. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] R1/f >0.35

42. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -0.6< (R11-R12)/(R11+ R12) <8.0

43. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -2.0< R13/f <1.0

44. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -10.0< (R5-R6)/(R5+ R6) <14.0

45. The lens module of claim 25, wherein the lens module satisfies the following conditional expression:

(conditional) ANG/f >15.0

46. A lens module, comprising in order from an object side to an image side:

a first lens having a positive refractive power;

a second lens having refractive power;

a third lens having a negative refractive power;

a fourth lens having positive refractive power;

a fifth lens having positive refractive power;

a sixth lens having negative refractive power;

47. The lens module as recited in claim 46, wherein the second lens has a negative refractive power.

48. The lens module of claim 46, wherein both surfaces of the first lens are convex.

49. The lens module of claim 46, wherein both surfaces of the second lens are concave.

50. The lens module of claim 46, wherein an object side surface of the third lens is convex and an image side surface of the third lens is concave.

51. The lens module of claim 46, wherein an object side surface of the fourth lens is convex and an image side surface of the fourth lens is concave.

52. The lens module of claim 46, wherein an object side surface of the fifth lens is concave and an image side surface of the fifth lens is convex.

53. The lens module of claim 46, wherein an object side surface of the sixth lens is concave and an image side surface of the sixth lens is convex.

54. The lens module of claim 46, wherein an object side surface of the seventh lens is convex and an image side surface of the seventh lens is concave.

55. The lens module of claim 46, wherein one or more inflection points are formed on at least one of an object-side surface and an image-side surface of the sixth lens.

56. The lens module of claim 46, wherein one or more inflection points are formed on at least one of an object-side surface and an image-side surface of the seventh lens.

57. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional expression ]1.0< f12/f <2.1

58. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] TTL/f <1.40

59. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] BFL/f >0.2

60. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] R1/f >0.35

61. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -0.6< (R11-R12)/(R11+ R12) <8.0

62. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -2.0< R13/f <1.0

63. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -10.0< (R5-R6)/(R5+ R6) <14.0

64. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

(conditional) ANG/f >15.0

65. The lens module of claim 46, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] | f1| < | f3| ventilation

66. A lens module, comprising:

seven lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in order from an object side to an image side,

wherein,

the object side surface of the first lens is convex, and the first lens has positive refractive power;

the image side surface of the second lens is concave;

the object side surface of the third lens is convex;

the seventh lens element includes a concave image-side surface having one or more inflection points, and

the sixth lens has a negative refractive power.

67. The lens module of claim 66, wherein an image side surface of the fifth lens is convex.

68. The lens module of claim 67, wherein the fourth and fifth lenses have meniscus shapes that are concave toward the object.

69. The lens module of claim 67, wherein the third, fourth, fifth, and sixth lenses have meniscus shapes.

70. The lens module of claim 66, wherein an image side surface of the first lens is concave and an object side surface of the second lens is convex.

71. The lens module of claim 66, wherein an image side surface of the first lens is convex and an object side surface of the second lens is concave.

72. The lens module as recited in claim 66, wherein the third lens has a positive refractive power and the seventh lens has a negative refractive power.

73. The lens module of claim 72, wherein the second lens has a positive refractive power.

74. The lens module as recited in claim 66, wherein the third lens has a negative refractive power, the fourth lens has a positive refractive power, the fifth lens has a positive refractive power, and the seventh lens has a negative refractive power.

75. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional expression ]1.0< f12/f <2.1

Where f12 is a composite focal length of the first lens and the second lens, and f is a total focal length of the lens module.

76. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] TTL/f <1.40

Wherein, TTL is the distance from the object side surface of the first lens to the image plane, and f is the total focal length of the lens module.

77. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] BFL/f >0.2

Wherein BFL is a distance from an image side surface of the seventh lens to an image plane, and f is a total focal length of the lens module.

78. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] R1/f >0.35

Where R1 is a radius of curvature of the object side surface of the first lens, and f is an overall focal length of the lens module.

79. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -0.6< (R11-R12)/(R11+ R12) <8.0

80. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -2.0< R13/f <1.0

Where R13 is a radius of curvature of an object side surface of the seventh lens, and f is an overall focal length of the lens module.

81. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional formula ] -10.0< (R5-R6)/(R5+ R6) <14.0

82. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

(conditional) ANG/f >15.0

Wherein ANG is a viewing angle of the lens module, and f is a total focal length of the lens module.

83. The lens module of claim 66, wherein the lens module satisfies the following conditional expression:

[ conditional expression ] | f1| < | f3| ventilation