KR102077234B1 - Photographing lens and photographing apparatus - Google Patents

Abstract

Disclosed is an imaging lens and an imaging device having the same.
The disclosed photographing lens includes: a first lens arranged in order from an object side to an image side, and having a positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having a negative refractive power; and the upper surface of the sixth lens includes a concave surface near the optical axis.

Description

Photography lens and photographing apparatus including the same {Photographing lens and photographing apparatus}

An embodiment of the present invention relates to a small photographing lens and a photographing apparatus including the same.

BACKGROUND ART Imaging devices using solid-state imaging devices such as a charge coupled devices (CCD) type image sensor or a complementary metal-oxide semiconductor (CMOS) type image sensor are widely used. Such photographing devices include digital still cameras, video cameras, and interchangeable lens cameras. In addition, since the imaging device using the solid-state imaging element is suitable for miniaturization, it has recently been applied to small information terminals, such as mobile phones. Users have demands for high performance such as high resolution and wide angle. In addition, consumer expertise in cameras continues to increase.

The miniaturization and high pixelation of the imaging device are progressing, and accordingly, high resolution and high performance of the imaging lens are required. However, although a bright lens having an F number of 2.8 or higher was also implemented, it is difficult to obtain sufficient optical performance due to the effect of diffraction in the case of a bright lens.

An embodiment of the present invention provides a photographing lens that is compact and has high imaging performance.

An embodiment of the present invention provides a photographing apparatus including a photographing lens having a small size and high imaging performance.

The photographing lens according to an embodiment of the present invention is arranged in order from the object side to the image side,

A first lens having positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having negative refractive power;

The upper surface of the sixth lens has a concave surface near the optical axis,

The following equation is satisfied.

<Expression>

-1.0 <r42 / f

Here, r42 is the paraxial curvature radius of the image-side surface of the fourth lens, and f is the focal length of the photographing lens.

The photographing lens according to another embodiment of the present invention is arranged in order from the object side to the image side,

A first lens having positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having negative refractive power, wherein the upper surface of the sixth lens has a concave surface near the optical axis,

The following equation is satisfied.

<Expression>

r11 <| r12 |

| r52 | <| r42 |

Here, r11 is the paraxial curvature radius of the object-side surface of the first lens, r12 is the paraxial curvature radius of the image-side surface of the first lens, r42 is the paraxial curvature radius of the image-side surface of the fourth lens, and r52 is It is the paraxial curvature radius of the image-side surface of the fifth lens.

The photographing lens according to another embodiment of the present invention is arranged in order from the object side to the image side,

A first lens having positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having negative refractive power, wherein the upper surface of the fourth lens has a concave surface near the paraxial axis, and the upper surface of the sixth lens has a concave surface near the optical axis.

The sixth lens may have at least one inflection point at a position other than the intersection point with the optical axis.

The object-side surface of the first lens may have a convex surface, and the image-side surface of the second lens may have a concave surface.

The photographing lens may satisfy the following equation.

<Expression>

20 <ν1-ν2 <70

Here, ν1 is the Abbe number for the d line of the first lens, and ν2 is the Abbe number for the d line of the second lens.

The upper surface of the third lens may have a concave meniscus shape near the optical axis.

The third lens may have positive refractive power.

The photographing lens may satisfy the following equation.

<Expression>

-3.5 <f2 / f <-0.5

1.0 <f3 / f <30.0

Here, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f is the focal length of the photographing lens.

The upper surface of the fourth lens is concave near the optical axis, and may have at least one inflection point at a position other than an intersection with the optical axis.

The fourth lens may have positive refractive power.

The photographing lens may satisfy the following equation.

<Expression>

0.4 <f1 / f <1.5

1.0 <f4 / f

Here, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f is the focal length of the photographing lens.

The sixth lens may have both concave shapes near the optical axis.

The photographing lens may satisfy the following equation.

<Expression>

0.2 <f5 / f <1.5

-1.5 <f6 / f <-0.1

Here, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f is the focal length of the photographing lens.

The photographing lens may satisfy the following equation.

<Expression>

-2.0 <(r11 + r12) / (r11-r12) <-0.1

Here, r11 is the paraxial curvature radius of the object-side surface of the first lens, and r12 is the paraxial curvature radius of the top surface-side surface of the first lens.

All lenses of the first lens to the sixth lens may be formed of a plastic material.

An imaging device according to an embodiment of the present invention includes: an imaging lens; Includes; a photographing element for receiving an optical image formed by the photographing lens and converting it into an electrical image signal.

A first lens arranged in order from the object side to the image side and having a positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having negative refractive power, wherein the upper surface of the sixth lens has a concave surface near the optical axis, and satisfies the following equation.

<Expression>

-1.0 <r42 / f

Here, r42 is the paraxial curvature radius of the image-side surface of the fourth lens, and f is the focal length of the photographing lens.

A photographing apparatus according to another embodiment of the present invention includes a photographing lens; Includes; a photographing element for receiving an optical image formed by the photographing lens and converting it into an electrical image signal.

A first lens arranged in order from the object side to the image side and having a positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having negative refractive power, wherein the upper surface of the sixth lens has a concave surface near the optical axis, and satisfies the following equation.

<Expression>

r11 <| r12 |

| r52 | <| r42 |

Here, r11 is the paraxial curvature radius of the object-side surface of the first lens, r12 is the paraxial curvature radius of the image-side surface of the first lens, r42 is the paraxial curvature radius of the image-side surface of the fourth lens, and r52 is It is the paraxial curvature radius of the image-side surface of the fifth lens.

A photographing apparatus according to another embodiment of the present invention includes a photographing lens; Includes; a photographing element for receiving an optical image formed by the photographing lens and converting it into an electrical image signal.

A first lens arranged in order from the object side to the image side and having a positive refractive power; A second lens having negative refractive power; A third lens; A fourth lens; A fifth lens having positive refractive power; And a sixth lens having negative refractive power, wherein the upper surface of the fourth lens has a concave surface near the paraxial axis, and the upper surface of the sixth lens has a concave surface near the optical axis.

The imaging lens according to the embodiment of the present invention has a small Fno, small size, and high imaging performance by appropriately configuring the shape of each lens.

1 shows a photographing lens according to a first embodiment of the present invention.
FIG. 2 is an aberration diagram of the photographing lens shown in FIG. 1.
3 shows a photographing lens according to a second embodiment of the present invention.
4 is an aberration diagram of the photographing lens shown in FIG. 3.
5 shows a photographing lens according to a third embodiment of the present invention.
6 is an aberration diagram of the photographing lens shown in FIG. 5.
7 shows a photographing lens according to a fourth embodiment of the present invention.
8 is an aberration diagram of the photographing lens illustrated in FIG. 7.
9 shows a photographing lens according to a fifth embodiment of the present invention.
10 is an aberration diagram of the photographing lens illustrated in FIG. 9.
11 shows a photographing lens according to a sixth embodiment of the present invention.
12 is an aberration diagram of the photographing lens illustrated in FIG. 11.
13 shows a photographing lens according to a seventh embodiment of the present invention.
14 is an aberration diagram of the photographing lens illustrated in FIG. 13.
15 shows a photographing lens according to an eighth embodiment of the present invention.
16 is an aberration diagram of the photographing lens shown in FIG. 15.
17 schematically illustrates a photographing apparatus including a photographing lens according to an embodiment of the present invention.

Hereinafter, an imaging lens according to an embodiment of the present invention and an imaging device having the same will be described in detail with reference to the accompanying drawings.

1 shows a photographing lens according to an embodiment of the present invention. The photographing lens is a first lens (G1), a second lens (G2), a third lens (G3), a fourth lens (from the object side (O) to the image side (I) in order. G4), a fifth lens (G5), and a sixth lens.

An optical aperture stop SP may be disposed on the image side I of the first lens G1. For example, a sheet-shaped aperture stop SP may be disposed between the first lens G1 and the second lens G2. An optical block G may be provided on the image side I of the sixth lens G6. That is, the optical block G may be disposed between the sixth lens G6 and the image plane IP. The optical block G may include, for example, an optical filter or a phase plate. Alternatively, a flat optical member such as a cover glass or an infrared cut filter may be disposed as the optical block.

When a shooting lens is used as a shooting optical system such as an interchangeable lens camera, a surveillance camera, a video camera, or a digital still camera, the top surface (IP) may correspond to the shooting surface of a shooting element (photoelectric conversion element) such as a CCD sensor or CMOS sensor. have. When a photographing lens is used for a camera for a silver salt film, the top surface (IP) may correspond to the film surface.

The first lens G1 may have a positive refractive power. The first lens G1 has a convex surface on the object side O. In this example, the object-side surface of the first lens G1 may have a stronger paraxial radius of curvature than the image-side surface.

By forming the first lens G1 as a positive lens, light incident on the photographing lens can be condensed, and the size of the lens following the first lens G1 can be reduced.

Further, by making the object-side surface of the first lens convex, light incident on the photographing lens is condensed, and high imaging performance can be secured while miniaturizing the rear lens than the first lens G1.

The second lens G2 has a negative refractive power.

The second lens G2 may have a meniscus shape in which an image side plane is concave.

By forming the second lens G2 as a negative lens, the light incident on the image plane can be widened to the periphery of the screen.

Further, by forming the image-side surface of the second lens G2 as a concave surface, coma aberration can be corrected satisfactorily and high imaging performance can be obtained.

The third lens G3 may have a positive refractive power.

The third lens G3 may have a positive meniscus shape in which the image side is concave. For example, the upper surface of the third lens G3 may have a concave shape near the optical axis.

By forming the image-side surface of the third lens as a concave surface, the action of the image-side surface constituting the second lens can be dispersed, and assembly variations occurring during manufacturing can be suppressed, thereby obtaining high imaging performance. Further, by forming the third lens in a positive meniscus shape, many aberrations to the periphery of the screen can be corrected satisfactorily.

The fourth lens G4 may have a positive refractive power.

The upper surface of the fourth lens G4 may have a concave meniscus shape. For example, the image-side surface of the fourth lens may be formed as a concave surface near the paraxial axis.

The image side surface of the fourth lens G4 may have at least one inflection point at a position other than an intersection point with the optical axis. Thereby, the refractive power of the image-side surface of the fourth lens G4 can be dispersed, and the assembly variation occurring during manufacturing can be suppressed, thereby obtaining high imaging performance. Here, the inflection point represents a point where the refractive power (or curvature) changes from (+) to (-) or (-) to (+).

Further, by using the fourth lens G4 as both lenses, the power (refractive power) of both lenses of the photographing lens can be dispersed, and aberrations can be satisfactorily corrected to the periphery of the screen.

The fifth lens G5 may have a positive refractive power.

The fifth lens G5 may have a meniscus shape in which the image side is convex.

In this example, the paraxial curvature radius of the upper surface of the fifth lens G5 may have a stronger curvature than the paraxial curvature radius of the upper surface of the fourth lens G4.

Thus, high imaging performance can be obtained by arranging a positive third lens, a positive fourth lens, and a positive fifth lens.

The sixth lens G6 may have negative refractive power.

The upper surface of the sixth lens G6 may have a concave shape near the optical axis. The sixth lens G6 may have at least one inflection point at a position other than an intersection with the optical axis. For example, when the image-side surface of the sixth lens has a concave shape near the optical axis, it may indicate that it has a concave shape in a range up to an inflection point around the optical axis.

By making the sixth lens a positive concave shape near the optical axis, negative refractive power can be dispersed. In addition, since the angle of incidence of the light incident on the image surface can be secured by using not only the image side surface but also the object side surface of the sixth lens G6, it is possible to secure a high imaging performance in the periphery of the screen. Then, it is possible to satisfactorily correct all aberrations at the periphery of the screen, and it is easy to ensure the incident angle characteristics of the light rays incident on the upper surface.

Further, in this example, when focusing from an infinite object distance to a short distance, focusing is performed by moving the entire first lens G1 through the sixth lens G6. Although focusing may be performed by moving some of the first to sixth lenses, it is preferable to move the whole in order to secure good performance at an infinite object distance and near field, and to reduce the size.

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

-1.0 <r42 / f <Equation 1>

Here, r42 is the paraxial curvature radius of the image-surface side of the fourth lens G4, and f is the focal length of the photographing lens.

Equation 1 limits the ratio between the paraxial curvature radius of the image-side surface of the fourth lens G4 and the focal length of the photographing lens. When the lower limit of r42 / f is less than the lower limit of Equation 1, the curvature of the upper side becomes too strong, and the convergence action on the upper side becomes too strong, so the overall length of the shooting lens must be increased to secure the desired image height, making it difficult to downsize do.

For example, the photographing lens may satisfy the following equation.

-0.8 <r42 / f <2.8 <Equation 1a>

Alternatively, the photographing lens according to the embodiment of the present invention may satisfy the following equation. In this case, Equation 1 may be satisfied or Equation 1 may not be satisfied.

r11 <| r12 | <Equation 2>

| r52 | <| r42 | <Equation 3>

Here, r11 is the paraxial curvature radius of the object-side surface of the first lens G1, r12 is the paraxial curvature radius of the image-side surface of the first lens G1, and r42 is the parity of the image-side surface of the fourth lens G4. The radius of curvature, r52 is the paraxial radius of curvature of the image-side surface of the fifth lens G5.

Equation 2 defines the paraxial curvature radius of the object-side surface of the first lens G1 and the paraxial curvature radius of the image-side surface. If the curvature of the image-side surface of the first lens becomes stronger than the curvature of the object-side surface, correction of coma aberration occurring in the image-side surface may become difficult. In addition, if the curvature of the object-side surface of the first lens is smaller than that of the image-side surface, a sufficient convergence effect cannot be obtained, and it becomes difficult to achieve miniaturization of the lens following the first lens.

Equation 3 limits the ratio of the paraxial curvature radius of the image-side surface of the fourth lens G4 to the paraxial curvature radius of the image-side surface of the fifth lens G5.

When the curvature of the image side of the fourth lens G4 is stronger than the curvature of the image side of the fifth lens G5, the convergence action becomes so strong that the entire length of the photographing lens has to be increased in order to secure a desired image height, making miniaturization difficult. Can be. In addition, when the curvature of the upper surface of the fifth lens G5 is smaller than the upper surface of the fourth lens G4, the angle of incidence of the light incident on the upper surface to be corrected by the upper surface of the sixth lens G6 and the peripheral portion of the screen It becomes difficult to correct the aberration at.

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

20 <ν1-ν2 <70 <Equation 4>

Here, ν1 is the Abbe number for the d line of the first lens G1, and ν2 represents the Abbe number for the d line of the second lens G2.

Equation 4 is an equation that limits the Abbe number of the first lens and the Abbe number of the second lens. By satisfying Equation 4, chromatic aberration can be reduced or eliminated. For example, the first lens and the second lens may be formed of glass. When (ν1-ν2) exceeds the upper limit of Equation 4, it may be difficult to use a stable quality material at low cost, for example, a glass material.

When (ν1-ν2) is below the lower limit of Expression 4, it becomes difficult to correct axial chromatic aberration or magnification chromatic aberration.

For example, the photographing lens may satisfy the following equation.

23 <ν1-ν2 <50 <Equation 4a>

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

-3.5 <f2 / f <-0.5 <Equation 5>

1.0 <f3 / f <30.0 <Equation 6>

Here, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, and f represents the focal length of the photographing lens.

Equation 5 limits the ratio of the focal length of the second lens G2 and the focal length of the photographing lens.

When (f2 / f) exceeds the upper limit of Equation 5, the refractive power of the second lens G2 becomes strong, and the divergence effect becomes too strong, making it difficult to correct aberrations around the screen.

When (f2 / f) is below the lower limit of Equation 5, the refractive power of the second lens G2 is weakened and the divergence effect is weakened, making it difficult to increase the angle of incidence of the off-axis light, making it difficult to downsize.

Equation 6 limits the focal length of the third lens G3 and the focal length of the photographing lens. When (f3 / f) exceeds the upper limit of Equation 6, the refractive power of the third lens G3 is weakened, it is difficult to correct the off-axis light emitted from the second lens G2, and it is difficult to correct the aberration around the screen. It becomes difficult.

When (f3 / f) is less than the lower limit of Equation 6, the refractive power of the third lens G3 becomes strong, and the convergence action becomes too strong, so that the overall length has to be increased to secure the desired image height, making miniaturization difficult.

For example, the photographing lens may satisfy the following equation.

-2.5 <f2 / f <-0.8 <Equation 5a>

2.0 <f3 / f <20.0 <Equation 6a>

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

0.4 <f1 / f <1.5 <Equation 7>

1.0 <f4 / f <Equation 8>

Here, f1 is the focal length of the first lens G1, f4 is the focal length of the fourth lens G4, and f represents the focal length of the photographing lens.

Equation 7 defines the focal length of the first lens G1 and the focal length of the photographing lens. When (f1 / f) satisfies Expression 7, the sensitivity is suppressed, it is compact, and it can be advantageous in securing optical performance.

When (f1 / f) exceeds the upper limit of Equation 7, the refractive power of the first lens G1 is weakened, and the diameter of the first lens G1 is increased, so that the photographing lens may be enlarged.

When (f1 / f) is less than the lower limit of Expression 7, the refractive power of the first lens G1 becomes strong, it is difficult to correct the aberration, and it is difficult to achieve high performance.

Equation 8 limits the focal length of the fourth lens G4 and the focal length of the photographing lens.

When (f4 / f) is below the lower limit of Equation 8, the refractive power of the fourth lens G4 becomes strong, and the convergence action becomes too strong, making correction of astigmatism difficult.

For example, the photographing lens may satisfy the following equation.

0.6 <f1 / f <1.0 <Equation 7a>

2.0 <f4 / f <115 <Equation 8a>

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

0.2 <f5 / f <1.5 <Equation 9>

-1.5 <f6 / f <-0.1 <Equation 10>

Here, f5 represents the focal length of the fifth lens, f6 represents the focal length of the sixth lens, and f represents the focal length of the photographing lens.

Equation 9 limits the ratio of the focal length of the fifth lens G5 and the focal length of the photographing lens.

When (f5 / f) exceeds the upper limit of Equation 9, the refractive power of the fifth lens G5 becomes weak, sufficient convergence cannot be achieved in the fifth lens G5, and the light beam to the image plane performed by the sixth lens G6 It is difficult to secure the incident angle characteristics.

When (f5 / f) is below the lower limit of Equation 9, the refractive power of the fifth lens G5 becomes stronger, and the convergence action becomes too strong, making correction of astigmatism difficult.

Equation 10 limits the ratio of the focal length of the sixth lens G6 and the focal length of the photographing lens.

When (f6 / f) exceeds the upper limit of Equation 10, the refractive power of the sixth lens G6 becomes strong, the divergence effect becomes too strong, and it is difficult to secure the angle of incidence characteristic to the image plane.

When (f6 / f) is less than the lower limit of Expression 10, the refractive power of the sixth lens G6 is weakened, the divergence effect is weakened, and correction of astigmatism near the center of the screen becomes difficult.

For example, the photographing lens may satisfy the following equation.

0.3 <f5 / f <1.0 <Equation 9a>

-1.0 <f6 / f <-0.2 <Equation 10a>

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

-2.0 <(r11 + r12) / (r11-r12) <-0.1 <Equation 11>

Here, r11 is the paraxial curvature radius of the object-side surface of the first lens, and r12 represents the paraxial curvature radius of the image-side surface of the first lens.

Equation 11 is an expression that limits the paraxial curvature radius of the object-side surface of the first lens G1 and the paraxial curvature radius of the image-side surface.

When [(r11 + r12) / (r11-r12)] exceeds the upper limit of Expression 11, the curvature of the upper surface has a strong convex shape, and it is difficult to suppress coma aberration generated during eccentricity.

On the other hand, when the curvature on the object side is loosened, the converging action in the first lens G1 is not sufficient and it is difficult to achieve miniaturization of the entire length.

When [(r11 + r12) / (r11-r12)] is below the lower limit of Equation 11, the curvature of the image side has a strong curvature in a concave shape, and the convergence action in the first lens G1 is not sufficient and the whole It becomes difficult to achieve miniaturization of length.

In addition, when the curvature on the object side when the lower limit of Expression 11 is considered is considered, it becomes difficult for the object side to maintain a convex shape.

For example, a photographing lens may satisfy the following equation.

-1.5 <(r11 + r12) / (r11-r12) <-0.15 <Equation 11a>

Meanwhile, all the lenses of the first lens G1 to the sixth lens G6 may be formed using the same plastic material.

By forming all the lenses of the first lens G1 to the sixth lens G6 from plastic lenses of the same material, performance changes can be reduced by offsetting the change in refractive index and shape according to the temperature change from each lens.

As described above, the photographing lens according to the embodiment of the present invention includes six lenses, and thus, a Fno is small, small, and has a high imaging performance, and a photographing lens with low manufacturing error can be implemented.

Hereinafter, the first to eighth embodiments of the present invention will be described.

Table 1 shows that each embodiment satisfies each conditional expression described above.

The surface number (i) in each embodiment indicates the order of the lens surface from the object side to the image side. ri is the radius of curvature of the i-th optical lens surface, di is the spacing between the i-th surface and the i + 1 surface, ndi and νdi are the refractive index of the i-th optical lens with respect to the d-line, respectively, and the Abbe number .

The back focus (BF) is a value obtained by converting the distance from the final surface of the lens to the paraxial upper surface. The total length of the photographing lens is a value obtained by adding back focus (BF) to the distance from the object side of the first lens to the final surface of the lens, that is, the image side of the sixth lens.

The unit of length is mm.

In addition, when K is the conic constant, A4, A6, A8, A10, and A12 are aspheric coefficients, and displacement in the direction of the optical axis at the position of the height h from the optical axis is x based on the surface vertex, aspherical shape Is as follows.

<식 12>

<Equation 12>

Here, R is the radius of curvature. In addition, for example, the display of "EZ" means "10-Z". f indicates focal length, Fno indicates F number, and ω indicates half angle of view.

(Example 1)

Table 2 shows the first embodiment. 1 shows a photographing lens of the first embodiment. 2 is an aberration diagram of the first embodiment.

2 illustrates spherical aberration, astigmatic aberration, and distortion of the photographing lens according to the first embodiment of the present invention. Astigmatism shows the astigmatism of the top surface of the Meridional (ΔM) and the astigmatism of the top surface of the sagittal (ΔS). Hereinafter, such an aberration diagram is shown in each embodiment.

(Example 2)

Table 3 shows the second embodiment. Fig. 3 shows the photographing lens of the second embodiment. 4 is an aberration diagram of the second embodiment.

(Example 3)

Table 4 shows the third embodiment. Fig. 5 shows the photographing lens of the third embodiment. 6 is an aberration diagram of the third embodiment.

(Example 4)

Table 5 shows the fourth embodiment. Fig. 7 shows the photographing lens of the fourth embodiment. 8 is an aberration diagram of the fourth embodiment.

(Example 5)

Table 6 shows the fifth embodiment. Fig. 9 shows the photographing lens of the fifth embodiment. 10 is an aberration diagram of the fifth embodiment.

(Example 6)

Table 7 shows the sixth example. Fig. 11 shows the photographing lens of the sixth embodiment. 12 is an aberration diagram of the sixth embodiment.

(Example 7)

Table 8 shows the seventh example. Fig. 13 shows the photographing lens of the seventh embodiment. 14 is an aberration diagram of the seventh embodiment.

(Example 8)

Table 8 shows the eighth example. Fig. 17 shows the photographing lens of the eighth embodiment. 18 is an aberration diagram of the eighth embodiment.

As described above, the photographing lens according to the embodiment of the present invention includes six lenses, and by properly configuring the shape and curvature of each lens, Fno is small, small, and has high imaging performance. The photographing lens according to the embodiment of the present invention may be applied to, for example, a video camera, a digital still camera, a mobile phone with a camera, or an information portable terminal.

17 shows an example of a photographing apparatus having a photographing lens according to an embodiment of the present invention. The photographing apparatus includes a photographing lens 100 and a photographing element 112 that receives an optical image formed by the photographing lens 100 and converts it into an electric image signal. The photographing lens 100 is the same as described with reference to FIGS. 1 to 16. The photographing apparatus has a housing 110 that can be detached from the photographing lens 100 as an interchangeable lens, and includes the photographing element in the housing 110. The photographing apparatus may include a recording means 113 in which information corresponding to an object photoelectrically converted from the photographing element 112 is recorded, and a view finder 114 for observing the subject image. Then, a display unit 115 on which the subject image is displayed may be provided. Here, an example in which the viewfinder 114 and the display unit 115 are separately provided is shown, but only the display unit may be provided without a viewfinder. The photographing apparatus illustrated in FIG. 17 is only an example, and is not limited thereto, and is applicable to cameras, mobile optical devices, and the like. By applying the photographing lens according to the embodiment of the present invention to a photographing apparatus such as a digital camera, a photographing apparatus that is compact, bright, and capable of photographing with high performance can be realized.

The above-described embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art. Therefore, the true technical protection scope according to the embodiment of the present invention should be determined by the technical spirit of the invention described in the following claims.

G1 ... first lens, G2 ... second lens,
G3 ... 3rd lens, G4 ... 4th lens,
G5 ... 5th lens, G6 ... 6th lens,
SP ... aperture, IP ... imaging surface
△ M ... Meridional top,
△ S ... top of sagittal hair, ω ... half angle of view,
Fno ... F number

Claims (20)

It is arranged in order from the object side to the top side,
A first lens having positive refractive power;
A second lens having negative refractive power;
A third lens;
A fourth lens;
A fifth lens having positive refractive power; And
It includes; a sixth lens having a negative refractive power;
The upper surface of the sixth lens has a concave surface near the optical axis,
A shooting lens that satisfies the following equation.
<Expression>
1.0 <f3 / f <3.0
Here, f3 is the focal length of the third lens, and f is the focal length of the photographing lens. delete delete According to claim 1,
The sixth lens is a photographing lens having at least one inflection point at a position other than the intersection point with the optical axis. According to claim 1,
The object-side surface of the first lens has a convex surface,
A photographing lens having an upper surface of the second lens having a concave surface. According to claim 1,
A shooting lens that satisfies the following equation.
<Expression>
20 <ν1-ν2 <70
Here, ν1 is the Abbe number for the d line of the first lens, and ν2 is the Abbe number for the d line of the second lens. According to claim 1,
An imaging lens having a meniscus shape in which the image-side surface of the third lens is concave near the optical axis. The method of claim 7,
A photographing lens in which the third lens has a positive refractive power. The method of claim 7,
A shooting lens that satisfies the following equation.
<Expression>
-3.5 <f2 / f <-0.5
Here, f2 is the focal length of the second lens, and f is the focal length of the photographing lens. According to claim 1,
The imaging lens of the fourth lens is concave near the optical axis and has at least one inflection point at a position other than an intersection with the optical axis. The method of claim 10,
The fourth lens is a photographing lens having a positive refractive power. The method of claim 10,
A shooting lens that satisfies the following equation.
<Expression>
0.4 <f1 / f <1.5
1.0 <f4 / f
Here, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f is the focal length of the photographing lens. According to claim 1,
The sixth lens is a photographing lens having both concave shapes near the optical axis. The method of claim 13,
A shooting lens that satisfies the following equation.
<Expression>
0.2 <f5 / f <1.5
-1.5 <f6 / f <-0.1
Here, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f is the focal length of the photographing lens. According to claim 1,
A shooting lens that satisfies the following equation.
<Expression>
-2.0 <(r11 + r12) / (r11-r12) <-0.1
Here, r11 is the paraxial curvature radius of the object-side surface of the first lens, and r12 is the paraxial curvature radius of the top surface-side surface of the first lens. According to claim 1,
A photographing lens in which all lenses of the first to sixth lenses are formed of a plastic material. The photographing lens according to claim 1;
An imaging device that receives an optical image formed by the imaging lens and converts it into an electrical image signal. The method of claim 17,
The sixth lens is an imaging device having at least one inflection point at a position other than an intersection point with an optical axis. The method of claim 17,
The object-side surface of the first lens has a convex surface,
An imaging device in which the image-side surface of the second lens has a concave surface. The method of claim 17,
An imaging device that satisfies the following equation.
<Expression>
20 <ν1-ν2 <70
Here, ν1 is the Abbe number for the d line of the first lens, and ν2 is the Abbe number for the d line of the second lens.

Images