KR101514574B1 - Lens module - Google Patents

Abstract

A lens module of the present invention comprises: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; and a sixth lens in the shape that an inflection point is formed on a side of an image, having negative refractive power. The lens module can satisfy a conditional equation. The conditional equation is 0.3 < SD/f < 0.5. In the conditional equation, SD is the size of an aperture hole [mm], and f is an overall focal length of the lens module [mm].

Description

A lens module {Lens module}

The present invention relates to a lens module having an optical system composed of a six-lens system.

BACKGROUND ART [0002] In recent years, a portable terminal has a camera so that a video call and a photograph can be taken. In addition, as the function of the camera in the portable terminal gradually increases, the demand for high resolution and high performance of the camera for the portable terminal is increasing.

However, since portable terminals are becoming smaller or lighter in weight, there are limitations in realizing high-resolution and high-performance cameras.

In order to solve these problems, recently, a lens of a camera is made of a plastic material that is lighter than glass, and a lens module is composed of more than five lenses to realize a high resolution.

However, it is difficult to improve the chromatic aberration as compared with a lens made of a glass material, and it is difficult to realize a relatively bright optical system.

For reference, Patent Documents 1 to 4 are the prior art related to the present invention.

KR 2008-0057738 A KR 2008-0061461 A JP 2011-085733 A US 2012-0194726 A1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens module capable of realizing high resolution.

According to an aspect of the present invention, there is provided a lens module comprising: a first lens having a positive refractive power; A second lens having a positive refractive power; A third lens having a refractive power; A fourth lens having a positive refractive power; A fifth lens having a negative refractive power; And a sixth lens having a negative refracting power and having a shape in which an inflection point is formed on the image side, and the following conditional expression can be satisfied.

[Conditional expression] 0.36 < SD / f < 0.48

SD is the diameter of the aperture [mm] in the conditional expression, and f is the total focal length [mm] of the lens module.

In the lens module according to an embodiment of the present invention, the third lens may have a negative refractive power.

delete

In the lens module according to an embodiment of the present invention, the first lens may have a shape in which an object side is convex and an upper side is concave.

In the lens module according to an embodiment of the present invention, the second lens may have a shape in which the object side is convex and the image side is convex.

In the lens module according to an embodiment of the present invention, the third lens may have a shape in which the object side is convex and the image side is concave.

In the lens module according to an embodiment of the present invention, the fourth lens may have a shape in which the object side is concave and the image side is convex.

In the lens module according to an embodiment of the present invention, the fifth lens may have a shape in which an object side is concave and an upper side is convex.

In the lens module according to an embodiment of the present invention, the sixth lens may have a shape in which the object side is convex and the image side is concave.

In the lens module according to an embodiment of the present invention, the sixth lens may have a shape in which an inflection point is formed on an object side.

The lens module according to an embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] 1.1 <TTL / f <1.4

In the above conditional expression, TTL is the distance [mm] from the object side surface of the first lens to the image surface, and f is the total focal length [mm] of the lens module.

The lens module according to an embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] V4 - V5 <5.0

In the above conditional formula, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens.

The lens module according to an embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] | R2 | - | R1 | > 0

In the above conditional expression, R1 is the curvature radius [mm] of the object side surface of the first lens, and R2 is the curvature radius [mm] of the image side surface of the first lens.

The lens module according to an embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] SA <36

In the above conditional expression, SA is the sweep angle of the image side of the sixth lens.

According to another aspect of the present invention, there is provided a lens module comprising: a first lens having a positive refractive power; A second lens having a positive refractive power; A third lens having a refractive power; A fourth lens having a positive refractive power; A fifth lens having a negative refractive power; And a sixth lens having a negative refractive power, and the following conditional expression can be satisfied.

[Conditional expression] V5 <30

In the above conditional formula, V5 is the Abbe number of the fifth lens.

In the lens module according to another embodiment of the present invention, the third lens may have a negative refractive power.

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In the lens module according to another embodiment of the present invention, the first lens may have a shape in which the object side is convex and the upper side is concave.

In the lens module according to another embodiment of the present invention, the second lens may have a shape in which the object side is convex and the image side is convex.

In the lens module according to another embodiment of the present invention, the third lens may have a shape in which the object side is convex and the image side is concave.

In the lens module according to another embodiment of the present invention, the fourth lens may have a shape in which the object side is concave and the image side is convex.

In the lens module according to another embodiment of the present invention, the fifth lens may have a shape in which an object side is concave and an upper side is convex.

In the lens module according to another embodiment of the present invention, the sixth lens may have a shape in which the object side is convex and the image side is concave.

In the lens module according to another embodiment of the present invention, the sixth lens may have a shape in which an inflection point is formed on an object side.

The lens module according to another embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] 1.1 <TTL / f <1.4

In the above conditional expression, TTL is the distance [mm] from the object side surface of the first lens to the image surface, and f is the total focal length [mm] of the lens module.

The lens module according to another embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] V4 - V5 <5.0

In the above conditional formula, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens.

The lens module according to another embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] | R2 | - | R1 | > 0

In the above conditional expression, R1 is the curvature radius [mm] of the object side surface of the first lens, and R2 is the curvature radius [mm] of the image side surface of the first lens.

The lens module according to another embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] SA <36

In the above conditional expression, SA is the sweep angle of the image side of the sixth lens.

The lens module according to another embodiment of the present invention can satisfy the following conditional expression.

[Conditional expression] 0.36 < SD / f < 0.48

SD is the diameter of the aperture [mm] in the conditional expression, and f is the total focal length [mm] of the lens module.

The present invention can realize high resolution.

1 is a configuration diagram of a lens module according to an embodiment of the present invention,
FIGS. 2 and 3 are curves showing the aberration characteristics of the lens module shown in FIG. 1,
FIGS. 4 and 5 are tables showing the characteristics of the lens module shown in FIG. 1,
6 is a configuration diagram of a lens module according to another embodiment of the present invention,
FIGS. 7 and 8 are curves showing the aberration characteristics of the lens module shown in FIG. 6,
FIGS. 9 and 10 are tables showing the characteristics of the lens module shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, it is to be understood that the terminology used herein is for the purpose of describing the present invention only and is not intended to limit the technical scope of the present invention.

In addition, throughout the specification, a configuration is referred to as being 'connected' to another configuration, including not only when the configurations are directly connected to each other, but also when they are indirectly connected with each other . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

In the present specification, the first lens means the lens closest to the object side, and the sixth lens means the lens closest to the image side. The term &quot; front side &quot; means a side closer to the object side in the lens module, and &quot; rear side &quot; means a side closer to the image sensor in the lens module. In each lens, the first surface means a surface (or an object side surface) close to the object side, and the second surface means a surface (or an image surface) close to the image side. In the present specification, the units of the curvature radius (Radius), the thickness, the TTL, the SL, the IMGH, the total focal length of the optical system, and the focal length of each lens are all in mm. In addition, in the explanation of the shape of the lens, the convex shape means that the optical axis portion of the surface is convex, and the concave shape of the one surface means that the optical axis portion of the surface is concave. Therefore, even if one surface of the lens is described as a convex shape, the edge portion of the lens can be concave. Similarly, even if one surface of the lens is described as a concave shape, the edge portion of the lens can be convex.

FIG. 1 is a configuration diagram of a lens module according to an embodiment of the present invention, FIGS. 2 and 3 are curves showing aberration characteristics of the lens module shown in FIG. 1, and FIGS. 4 and 5 are cross- FIG. 6 is a configuration diagram of a lens module according to another embodiment of the present invention, FIGS. 7 and 8 are curves showing the aberration characteristics of the lens module shown in FIG. 6, and FIG. And FIG. 10 is a table showing the characteristics of the lens module shown in FIG.

The lens module according to the present invention may include an optical system composed of six lenses. In other words, the lens module may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. However, the lens module does not consist of only six lenses, and may further include other components as needed. For example, the lens module may include a stop for adjusting the amount of light. In addition, the lens module may further include an infrared cut filter for blocking infrared rays. Further, the lens module may further include an image sensor (i.e., an image pickup device) for converting an image of an object incident through the optical system into an electric signal. Further, the lens module may further include a gap holding member for adjusting the distance between the lens and the lens.

The first lens to the sixth lens constituting the optical system may be made of a plastic material. In addition, at least one of the first to sixth lenses may have an aspherical surface. Further, the first to sixth lenses may have at least one aspheric surface. That is, at least one of the first and second surfaces of the first lens to the sixth lens may be an aspherical surface.

In addition, the optical system composed of the first to sixth lenses may have an F number of 2.4 or less. In this case, it is possible to take a picture of a clear subject. For example, the lens module according to the present invention can take an image of a subject clearly even under low illumination conditions (for example, 100 lux or less).

The optical system including the first lens to the sixth lens can satisfy the conditional expression (1).

[Conditional expression 1] 0.36 < SD / f < 0.48

In the conditional expression 1, SD is the diameter of the aperture [mm], and f is the total focal length [mm] of the optical system.

The optical system including the first lens to the sixth lens can satisfy the conditional expression (2).

[Conditional expression 2] 1.1 <TTL / f <1.35

In Conditional Expression 2, TTL is the length [mm] from the first surface to the image surface of the first lens, and f is the total focal length [mm] of the optical system.

Here, it is difficult to secure the optical performance of the lens module deviating from the lower limit value of the conditional expression (2), and it may be difficult to downsize the lens module which exceeds the upper limit value of the conditional expression (2).

The optical system including the first lens to the sixth lens can satisfy the conditional expression (3).

[Conditional expression 3] V4 - V5 < 5.0

In Conditional Expression 3, V4 is the Abbe's value of the fourth lens, and V5 is the Abbe's value of the fifth lens.

Here, the lens module satisfying the conditional expression (3) can be easily miniaturized.

The optical system including the first lens to the sixth lens can satisfy the conditional expression (4).

[Conditional expression 4] | R2 | > | R1 |

In Conditional Expression 4, R2 is the radius of curvature [mm] of the second surface of the first lens, and R1 is the radius of curvature [mm] of the first surface of the first lens.

Here, the first lens satisfying the conditional expression (4) is easy to form, and sensitivity to manufacturing tolerance can be lowered.

The optical system including the first lens to the sixth lens can satisfy the conditional expression (5).

[Conditional expression 5] SA < 36

In Conditional Expression 5, SA is the sweep angle of the second surface of the sixth lens.

Here, the conditional expression 5 may be a numerical condition for minimizing total reflection of the sixth lens. For example, the lens module that is outside the upper limit value of the conditional expression 5 tends to cause inner reflection.

The optical system including the first lens to the sixth lens can satisfy the conditional expression (6).

[Conditional expression 6] 0 < f1 / f4 < 0.8

In Conditional Expression 6, f1 is the focal length [mm] of the first lens, and f4 is the focal length [mm] of the fourth lens.

The optical system including the first lens to the sixth lens can satisfy the conditional expression (7).

[Conditional expression 7] f5 / f6 > 0.8

In Conditional Expression 7, f5 is the focal length [mm] of the fifth lens, and f6 is the focal length [mm] of the sixth lens.

In the following, the first lens to the sixth lens constituting the optical system will be described.

The first lens may have a refractive power. For example, the first lens may have a positive refractive power. The first lens may have a convex shape on the first surface and a concave shape on the second surface. For example, the first lens may be a convex meniscus shape on the object side. At least one of the first surface and the second surface of the first lens may be aspherical. For example, the first lens may be both aspherical on both sides. The first lens can be made of a material having high light transmittance and excellent workability. For example, the first lens may be made of a plastic material. However, the material of the first lens is not limited to plastic. For example, the first lens may be made of glass.

The second lens may have a refractive power. For example, the second lens may have a positive refractive power. The second lens may have a convex shape on both sides. The second lens may have at least one of the first surface and the second surface aspherical. For example, the second lens may be both aspheric on both sides. The second lens can be made of a material having high light transmittance and excellent workability. For example, the second lens may be made of a plastic material. However, the material of the second lens is not limited to plastic. For example, the second lens may be made of glass.

The third lens may have a refractive power. For example, the third lens may have a negative refractive power. The third lens may have a concave shape on both sides. Alternatively, the third lens may have a convex shape on the first surface and a concave shape on the second surface. For example, the third lens may be a convex meniscus shape toward the object side or a convex plano-convex shape toward the object side. The third lens may have at least one of the first surface and the second surface aspherical. For example, the third lens may be both aspherical on both sides. The third lens can be made of a material having high light transmittance and excellent workability. For example, the third lens may be made of a plastic material. However, the material of the third lens is not limited to plastic. For example, the third lens may be made of glass. In addition, the third lens may have a smaller diameter than the first lens and the second lens. For example, the effective diameter of the third lens (that is, the diameter of the portion where the effective light is incident and refracted) may be smaller than the effective diameter of the first lens and the second lens.

The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power. The fourth lens may have a shape in which the first surface is concave and the second surface is convex. For example, the fourth lens may be an upwardly convex meniscus shape or an upwardly convex plano-convex shape. The fourth lens may have at least one of the first surface and the second surface aspherical. For example, the fourth lens may be both aspherical on both sides. The fourth lens can be made of a material having high light transmittance and excellent workability. For example, the fourth lens may be made of a plastic material. However, the material of the fourth lens is not limited to plastic. For example, the fourth lens may be made of glass.

The fifth lens may have a refractive power. For example, the fifth lens may have a negative refractive power. The fifth lens may have a shape in which the first surface is concave and the second surface is convex. For example, the fifth lens may be a meniscus shape convex upward. The fifth lens may have at least one of the first surface and the second surface aspherical. For example, the fifth lens may be both aspherical on both sides. The fifth lens may be made of a material having high light transmittance and excellent workability. For example, the fifth lens may be made of a plastic material. However, the material of the fifth lens is not limited to plastic. For example, the fifth lens may be made of glass.

The sixth lens may have a refractive power. For example, the sixth lens may have a negative refractive power. The sixth lens may have a convex shape on the first surface and a concave shape on the second surface. In addition, the sixth lens may have a shape in which an inflection point is formed on at least one surface. For example, the second surface of the sixth lens may be concave at the center of the optical axis, and convex toward the edge. The sixth lens may have at least one of the first surface and the second surface aspherical. For example, the sixth lens may be both aspherical on both sides. The sixth lens can be made of a material having high light transmittance and excellent workability. For example, the sixth lens may be made of a plastic material. However, the material of the sixth lens is not limited to plastic. For example, the sixth lens may be made of glass.

Meanwhile, in the lens module according to the embodiments, the effective diameter of the lens decreases from the first lens to the third lens, and the lenses are arranged such that the effective diameter of the lens increases from the fourth lens to the sixth lens . The optical system thus configured can increase the amount of light projected onto the image sensor, thereby improving the resolution of the lens module.

The lens module configured as described above can improve aberrations that cause image quality degradation. In addition, the lens module configured as described above can improve the resolution. In addition, the lens module configured as described above can be advantageous in weight reduction and lowering the production cost.

A lens module according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, and 5. FIG.

The lens module 100 according to the present embodiment includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, 60, and may further include an infrared cut filter 70 and an image sensor 80.

In this embodiment, the first lens 10 may have a positive refractive power. In addition, the first lens 10 may have a convex shape on the first surface and a concave shape on the second surface. The second lens 20 may have a positive refractive power. In addition, the second lens 20 may have a convex shape on both sides. The third lens 30 may have negative refractive power. In addition, the third lens 30 may have a convex shape on the first surface and a concave shape on the second surface. The fourth lens 40 may have a positive refractive power. In addition, the fourth lens 40 may have a shape in which the first surface is concave and the second surface is convex. The fifth lens 50 may have a negative refractive power. In addition, the fifth lens 50 may have a concave shape on the first surface and a convex shape on the second surface. The sixth lens 60 may have a negative refractive power. In addition, the sixth lens 60 may have a convex shape on the first surface and a concave shape on the second surface. Further, the sixth lens 60 may have an inflection point. For example, an inflection point may be formed on the second surface of the sixth lens 60.

The lens module 100 according to the present embodiment may include at least one diaphragm ST. For example, the diaphragm ST may be disposed between the second lens 20 and the third lens 30. The first diaphragm (ST) arranged in this way can perform the function of controlling the amount of light and vignetting.

The lens module thus configured may have the aberration characteristics shown in Figs. 2 and 3, and may have the lens characteristics shown in Figs. 4 and 5. 4 is a table showing curvature radii, thicknesses, distances and the like of lenses, and FIG. 5 is a table showing values of aspherical surfaces of lenses.

For example, A (1) in Fig. 4 represents the curvature radius of the object side surface of the first lens, and A (2) in Fig. 4 represents the curvature radius of the image side surface of the first lens. Here, the values of A (1), A (2), and A (i) can be calculated through FIG. For example, the value corresponding to A (1) in FIG. 4 is a reciprocal of a value corresponding to A (1) on the vertical axis and CURV on the horizontal axis in FIG. For example, the curvature radius A (5) of the object side surface of the third lens 30 is 9.138 [mm], which is an inverse number of A0 (5) on the ordinate axis and 0.109435 corresponding to the CURV on the abscissa axis in Fig. As another example, the curvature radius A (8) of the upper surface of the fourth lens 40 is -6.155 [mm], which is the reciprocal of -0.162472 corresponding to A (8) on the ordinate axis and CURV on the abscissa axis in Fig.

In addition, the thickness of each lens and the distance between the lenses can be confirmed from FIG. For example, the thickness of the first lens 10 is 0.49 [mm] corresponding to 1 on the ordinate axis and the thickness / distance on the abscissa axis in Fig. 4, and the distance between the first lens 10 and the second lens 20 is 0.0995 [mm] described below the value.

In addition, the refractive index and the Abbe number of each lens can be confirmed through the GLA value in FIG. For example, the refractive index of the second lens 20 is 1.544, and the Abbe number is 56.0. As another example, the refractive index of the third lens 30 is 1.639, and the Abbe number is 23.0.

Hereinafter, a lens module according to another embodiment of the present invention will be described with reference to FIGS. 6, 7, 8, 9, and 10. FIG.

The lens module 100 according to the present embodiment includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, 60, and may further include an infrared cut filter 70 and an image sensor 80.

In this embodiment, the first lens 10 may have a positive refractive power. In addition, the first lens 10 may have a convex shape on the first surface and a concave shape on the second surface. The second lens 20 may have a positive refractive power. In addition, the second lens 20 may have a convex shape on both sides. The third lens 30 may have negative refractive power. In addition, the third lens 30 may have a convex shape on the first surface and a concave shape on the second surface. The fourth lens 40 may have a positive refractive power. In addition, the fourth lens 40 may have a shape in which the first surface is concave and the second surface is convex. The fifth lens 50 may have a negative refractive power. In addition, the fifth lens 50 may have a concave shape on the first surface and a convex shape on the second surface. The sixth lens 60 may have a negative refractive power. In addition, the sixth lens 60 may have a convex shape on the first surface and a concave shape on the second surface. Further, the sixth lens 60 may have an inflection point. For example, an inflection point may be formed on the second surface of the sixth lens 60.

The lens module 100 according to the present embodiment may include at least one diaphragm ST. For example, the diaphragm ST may be disposed between the second lens 20 and the third lens 30. The first diaphragm (ST) arranged in this way can perform the function of controlling the amount of light and vignetting.

The lens module thus configured may have the aberration characteristics shown in FIGS. 7 and 8, and may have the lens characteristics shown in FIGS. 9 and 10. FIG. 9 is a table showing curvature radii, thicknesses, distances, and the like of lenses, and FIG. 10 is a table showing values of aspherical surfaces of lenses.

For example, A (3) in Fig. 9 represents the curvature radius of the object side surface of the second lens, and A (4) in Fig. 9 represents the curvature radius of the image side surface of the second lens. Here, the values of A (1), A (2), and A (i) can be calculated through FIG. For example, the value corresponding to A (3) in Fig. 9 is a reciprocal of a value corresponding to A (3) on the vertical axis and CURV on the horizontal axis in Fig. For example, the curvature radius A (3) of the object side surface of the second lens 20 is 2.302 [mm], which is the reciprocal of 0.434377 corresponding to A (3) on the ordinate axis and CURV on the abscissa axis in Fig. As another example, the curvature radius A (4) of the upper side of the second lens 20 is -147.102 [mm], which is the reciprocal of -0.006798 corresponding to A (4) on the ordinate axis and CURV on the abscissa axis in Fig.

In addition, the thickness of each lens and the distance between the lenses can be confirmed from FIG. For example, the thickness of the third lens 30 is 0.28 [mm] corresponding to the thickness / distance of the abscissa and the abscissa of the ordinate in Fig. 9, and the distance between the third lens 30 and the fourth lens 40 0.45 [mm] described below the value.

In addition, the refractive index and the Abbe number of each lens can be confirmed through the GLA value in FIG. For example, the refractive index of the fifth lens 50 is 1.639, and the Abbe number is 23.0.

Each of the above-described embodiments satisfies all the conditional expressions (1) to (7) of the present invention although there are some differences in some optical characteristics as shown in Table 1.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions And various modifications may be made.

10 First lens
20 Second lens
30 Third lens
40 fourth lens
50 fifth lens
60 sixth lens
70 Infrared cut filter
80 Image Sensor

Claims (29)

A first lens having a positive refractive power;
A second lens having a positive refractive power;
A third lens having a refractive power;
A fourth lens having a positive refractive power;
A fifth lens having a negative refractive power; And
A sixth lens having a negative refracting power and having a shape having an inflection point on an upper side;
Lt; / RTI &gt;
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] 0.36 < SD / f &lt; 0.48
(SD is the diameter of the aperture [mm] in the conditional expression and f is the total focal length [mm] of the lens module) The method according to claim 1,
And the third lens has a negative refractive power. delete The method according to claim 1,
Wherein the first lens has a convex shape on an object side and a concave shape on an upper side. The method according to claim 1,
Wherein the second lens has a convex shape on an object side and a convex shape on an upper side. The method according to claim 1,
Wherein the third lens has a convex shape on an object side and a concave shape on an upper side. The method according to claim 1,
Wherein the fourth lens has a convex shape on an object side and a convex on an image side. The method according to claim 1,
Wherein the fifth lens has a convex shape on an object side and a convex on an image side. The method according to claim 1,
Wherein the sixth lens has a convex surface on the object side and a concave surface on the image side. The method according to claim 1,
Wherein the sixth lens has a shape in which an inflection point is formed on an object side. The method according to claim 1,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] 1.1 <TTL / f <1.4
(TTL in the above conditional expression is the distance [mm] from the object side surface of the first lens to the image surface, and f is the total focal length [mm] of the lens module) The method according to claim 1,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] V4 - V5 <5.0
(Where V4 is the Abbe number of the fourth lens and V5 is the Abbe number of the fifth lens in the above conditional expression) The method according to claim 1,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] | R2 | - | R1 | > 0
(Where R1 is the curvature radius [mm] of the object side surface of the first lens and R2 is the curvature radius [mm] of the image side surface of the first lens) The method according to claim 1,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] SA <36
(SA is the sweep angle of the image side of the sixth lens in the conditional expression) A first lens having a positive refractive power;
A second lens having a positive refractive power;
A third lens having a refractive power;
A fourth lens having a positive refractive power;
A fifth lens having a negative refractive power; And
A sixth lens having a negative refractive power;
Lt; / RTI &gt;
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] V5 <30
(V5 is the Abbe number of the fifth lens in the above conditional expression) 16. The method of claim 15,
And the third lens has a negative refractive power. delete 16. The method of claim 15,
Wherein the first lens has a convex shape on an object side and a concave shape on an upper side. 16. The method of claim 15,
Wherein the second lens has a convex shape on an object side and a convex shape on an upper side. 16. The method of claim 15,
Wherein the third lens has a convex shape on an object side and a concave shape on an upper side. 16. The method of claim 15,
Wherein the fourth lens has a convex shape on an object side and a convex on an image side. 16. The method of claim 15,
Wherein the fifth lens has a convex shape on an object side and a convex on an image side. 16. The method of claim 15,
Wherein the sixth lens has a convex surface on the object side and a concave surface on the image side. 16. The method of claim 15,
Wherein the sixth lens has a shape in which an inflection point is formed on an object side. 16. The method of claim 15,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] 1.1 <TTL / f <1.4
(TTL in the above conditional expression is the distance [mm] from the object side surface of the first lens to the image surface, and f is the total focal length [mm] of the lens module) 16. The method of claim 15,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] V4 - V5 <5.0
(Where V4 is the Abbe number of the fourth lens and V5 is the Abbe number of the fifth lens in the above conditional expression) 16. The method of claim 15,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] | R2 | - | R1 | > 0
(Where R1 is the curvature radius [mm] of the object side surface of the first lens and R2 is the curvature radius [mm] of the image side surface of the first lens) 16. The method of claim 15,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] SA <36
(SA is the sweep angle of the image side of the sixth lens in the conditional expression) 16. The method of claim 15,
Wherein the lens module satisfies the following conditional expression.
[Conditional expression] 0.36 < SD / f < 0.48
(SD is the diameter of the aperture [mm] in the conditional expression and f is the total focal length [mm] of the lens module)

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