KR20140071868A - Photographing lens and photographing device - Google Patents

Abstract

A photographing lens and a photographing apparatus having the same are disclosed.
The disclosed photographing lens comprises: a first lens having a convex surface on the object side and having a positive refractive power; A second lens having a convex surface on the image side and having a negative refractive power; A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power; A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And a fifth lens having a concave surface on the image side in the vicinity of the optical axis and having a negative refractive power.

Description

[0001] DESCRIPTION [0002] Photographing lens and photographing device having the same [0003]

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

Imaging devices using solid-state imaging devices such as CCD (Charge Coupled Devices) type image sensors or CMOS (Complementary Metal-Oxide Semiconductor) type image sensors are widely used. Such photographing apparatuses include a digital still camera, a video camera, and an interchangeable lens camera. In addition, a photographing device using a solid-state imaging device is suitable for miniaturization, and recently it has been applied to a small information terminal including a cellular phone. Users have a demand for high performance such as high resolution and wide angle. In addition, consumers' expertise in cameras is steadily increasing.

The size and heightening of the size of the image pickup device have progressed, and accordingly, a high resolution and high performance of the photographing lens have been demanded. However, although a bright lens having an F number of 2.8 or more is also realized, it is difficult to obtain sufficient optical performance due to the influence of diffraction in the case of a bright lens.

Embodiments of the present invention provide a photographic lens that is compact and has high imaging performance.

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

A photographic lens of the present invention comprises: a first lens arranged in order from an object side to an image side, the first lens having a convex surface on the object side and having a positive refractive power; A second lens having a convex surface on the image side and having a negative refractive power; A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power; A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And a fifth lens having a concave surface on the image side in the vicinity of the optical axis and having a negative refracting power, and the following formula is satisfied.

<Expression>

-3.0 <(r21 + r22) / (r21-r22) <1.0

-10.0 < (r31 + r32) / (r31-r32) < - 1.5

Wherein r21 is a paraxial radius of curvature of the object side surface of the second lens, r22 is a paraxial radius of curvature of the upper surface of the second lens, r31 is a paraxial radius of curvature of the object side surface of the third lens, 3 is the paraxial radius of curvature of the upper surface of the lens.

The first lens and the second lens satisfy the following equations.

<Expression>

0.75 < f1 / f < 1.4

-2.0 < f2 / f < -0.7

Here, f represents the focal length of the photographing lens, f1 represents the focal length of the first lens, and f2 represents the focal length of the second lens.

The third lens and the fourth lens satisfy the following equations.

<Expression>

1.2 < f3 / f < 3.8

0.4 < f4 / f < 1.0

Here, f is the focal length of the photographing lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

The fifth lens satisfies the following expression.

<Expression>

-0.85 < f5 / f < -0.3

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

The fifth lens has a concave shape in the vicinity of the optical axis.

The upper surface of the second lens does not have an inflection point.

And the upper surface of the fifth lens has at least one inflection point other than the intersection with the optical axis.

The first lens, the third lens, the fourth lens, and the fifth lens are formed of the same material.

The photographing lens satisfies the following expression.

<Expression>

? d1345> 50.0

Here, vd1345 represents the Abbe number with respect to the d line of the first lens, the third lens, the fourth lens, and the fifth lens.

The photographing lens satisfies the following expression.

<Expression>

vd2 < 25.0

Here, vd2 represents the Abbe number with respect to the d line of the second lens.

The photographing lens satisfies the following expression.

<Expression>

D34t < D3t

Here, D34t represents the air-space distance on the optical axis between the third lens and the fourth lens, and D3t represents the thickness on the optical axis of the third lens.

The photographing lens satisfies the following expression.

<Expression>

1.0 < (r41 + r42) / (r41 - r42) < 3.0

Here, r41 represents the radius of paraxial curvature of the object-side surface of the fourth lens, and r42 represents the paraxial radius of curvature of the upper surface of the fourth lens.

The photographing lens satisfies the following expression.

<Expression>

-0.8 < (r51 + r52) / (r51-r52) < 3.0

Here, r51 is a paraxial radius of curvature of the object side surface of the fifth lens, and r52 is a paraxial radius of curvature of the surface of the fifth lens at the top surface.

An imaging device according to an embodiment of the present invention includes an imaging lens and an imaging element that receives an optical image formed by the imaging lens and converts the optical image into an electrical image signal,

A first lens arranged in order from an object side to an image side, the first lens having a convex surface on the object side and having a positive refractive power; A second lens having a convex surface on the image side and having a negative refractive power; A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power; A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And a fifth lens having a concave surface on the image side in the vicinity of the optical axis and having a negative refracting power, and the following formula is satisfied.

<Expression>

-3.0 <(r21 + r22) / (r21-r22) <1.0

-10.0 < (r31 + r32) / (r31-r32) < - 1.5

Wherein r21 is a paraxial radius of curvature of the object side surface of the second lens, r22 is a paraxial radius of curvature of the upper surface of the second lens, r31 is a paraxial radius of curvature of the object side surface of the third lens, 3 is the paraxial radius of curvature of the upper surface of the lens.

The imaging lens according to the embodiment of the present invention has 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.
2 is an aberration diagram of the photographing lens shown in Fig.
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.
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.
7 shows a photographing lens according to a fourth embodiment of the present invention.
8 is an aberration diagram of the photographing lens shown in Fig.
9 shows a photographing lens according to a fifth embodiment of the present invention.
10 is an aberration diagram of the photographing lens shown in Fig.
11 shows a photographing lens according to a sixth embodiment of the present invention.
12 is an aberration diagram of the photographing lens shown in Fig.
13 shows a photographing lens according to a seventh embodiment of the present invention.
14 is an aberration diagram of the photographing lens shown in Fig.
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.
17 schematically shows a photographing apparatus including a photographing lens according to an embodiment of the present invention.

Hereinafter, a photographing lens and a photographing apparatus having the same according to an embodiment of the present invention 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 has a first lens G1, a second lens G2, a third lens G3 and a fourth lens G3 in order from the object side (O) to the image side (I) G4, and a fifth lens G5.

An optical aperture stop SP may be disposed on the upper side I of the first lens G1. For example, a sheet-like aperture stop SP may be disposed between the first lens G1 and the second lens G2. An optical block G may be provided between the fifth lens G5 and an image plane IP. The optical block G may comprise, for example, an optical filter or a phase plate. Alternatively, as the optical block, for example, a plate-like optical member such as a cover glass or an infrared cut filter may be disposed.

When the photographing lens is used as a photographing optical system such as a replacement lens camera, a surveillance camera, a video camera, a digital still camera or the like, the top surface IP corresponds to the photographing surface of a solid-state photographing element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor .

When the photographing lens is used for a silver halide film camera, the image 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 first lens G1 has a convex shape having a convex surface on the image side.

By forming the object-side surface of the first lens to have a convex shape, it is possible to focus the light incident on the photographing lens and secure a high imaging performance while reducing the size of the lens subsequent to the first lens G1.

The second lens G2 may have a negative refractive power. The second lens G2 may have a convex surface on the image side. The second lens G2 may have a meniscus shape. Further, an inflection point is not provided on the upper surface of the second lens. The inflection point indicates a point where the refractive power (or curvature) changes from (+) to (-) or changes from (-) to (+). By having the convex surface having no inflection point on the upper surface of the second lens, it is possible to reduce the influence on the eccentricity which greatly affects the assembling deviation, for example, the deterioration in performance, which occurs during lens manufacturing.

The third lens G3 may have a positive refractive power. The third lens G3 may have a concave surface on the upper side. The third lens G3 may have a meniscus shape. High imaging performance can be obtained by forming the third lens G3 with a meniscus lens having a concave surface on the image side (I).

The fourth lens G4 may have a positive refractive power.

The fourth lens G4 may have a convex surface on the upper surface. The fourth lens G4 may have a meniscus shape. By forming the fourth lens G4 with a meniscus lens having a convex surface on the image side, the aberration can be corrected well to the peripheral portion of the screen.

The fifth lens G5 may have a positive refractive power.

The fifth lens G5 may have at least one inflection point at a position other than the intersection point with the optical axis on the image side plane. The fifth lens G5 may have a concave shape on the upper surface in the vicinity of the optical axis. The fifth lens G5 is capable of satisfactorily correcting the aberration at the peripheral portion of the screen and making it easy to secure the incident angle characteristic of the light ray incident on the upper side.

Also, in this embodiment, focusing is performed by moving the entire first to fifth lenses G1 to G5 during focusing from the infinite object distance to the near side. Although focusing may be performed by moving some lenses among the first to fifth lenses, it is preferable to move all of the first to fifth lenses in order to ensure good performance at a short distance from the infinite object distance and to downsize the lens.

The photographing lens according to the embodiment of the present invention can satisfy the following expression.

-3.0 < (r21 + r22) / (r21-r22) <

-10.0 < (r31 + r32) / (r31-r32) < - 1.5 &

Here, r21 is the paraxial radius of curvature of the object side surface of the second lens, r22 is the paraxial radius of curvature of the upper surface of the second lens, r31 is the paraxial radius of curvature of the object side surface of the third lens, Represents the paraxial radius of curvature of the upper surface of the lens.

Equation 1 defines the paraxial radius of curvature of the object-side surface of the second lens G2 and the paraxial radius of curvature of the image-side surface. The manufacturing error can be reduced by satisfying the formula (1).

If (r21 + r22) / (r21-r22)] exceeds the upper limit of the formula (1), it is difficult to maintain the shape having the convex surface without the upper surface having the inflection point, It gets harder.

Further, the curvature of the object side surface can not maintain the negative refractive power of the second lens, and it may become difficult to secure performance around the screen.

If [r21 + r22) / (r21-r22)] is lower than the lower limit of the formula (1), the curvature of the upper surface becomes larger and the diverging action becomes stronger.

Further, regarding the curvature of the object side surface, the negative refracting power of the second lens is weakened, and the surface that gives rise to the diverging action is reduced, so that it is difficult to correct the Petzval sum.

Equation 2 defines the paraxial radius of curvature of the object-side surface of the third lens and the paraxial radius of curvature of the image-side surface. This can limit the shape of the third lens necessary for ensuring optical performance.

When [(r31 + r32) / (r31-r32)] exceeds the upper limit of the formula (2), the curvature of the object side becomes large while the curvature of the upper side becomes small. As a result, the angle of incidence of light on the object side surface of the third lens becomes large, and it becomes difficult to correct coma aberration.

When [r31 + r32) / (r31-r32)] is lower than the lower limit of the formula (2), the curvature of the object side becomes smaller while the curvature of the upper side becomes larger. As a result, the spherical aberration increases, and aberration correction becomes difficult.

The photographing lens according to the embodiment of the present invention can satisfy the following expression.

-2.0 < (r21 + r22) / (r21-r22) <

-8.0 <(r31 + r32) / (r31-r32) <- 2.3 <Formula 2a>

Further, the fifth lens G5 may have a concave shape in the vicinity of the optical axis.

By forming the fifth lens G5 in both recesses in the vicinity of the optical axis, it is possible to disperse the negative refracting power, and the incidence angle characteristic of the light ray incident on the upper surface can be secured not only on the image side of the fifth lens, Therefore, it is possible to secure a high imaging performance at the periphery of the screen.

The first through fifth lenses may satisfy the following formulas, respectively.

0.75 < f1 / f < 1.4 &

-2.0 < f2 / f < -0.7 <

1.2 < f3 / f < 3.8 &

0.4 < f4 / f < 1.0 &

-0.85 < f5 / f < -0.3 <

Here, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, f5 denotes the focal length of the fifth lens G5, and f denotes the focal length of the entire photographing lens.

Equation 3 defines the ratio of the focal length of the first lens G1 to the focal length of the photographing lens. (f1 / f) If the refractive power of the first lens G1 is weakened beyond the upper limit value of the formula (3), the diameter of the first lens G1 can be increased and increased. If (f1 / f) is lower than the lower limit value of the formula (3), the refractive power of the first lens (G1) becomes strong and it becomes difficult to correct the aberration and it is difficult to obtain high performance.

Equation 4 defines the ratio of the focal length of the second lens G2 to the focal length of the photographing lens. (f2 / f) exceeds the upper limit value of the formula (4), the refracting power of the second lens (G2) becomes strong and the diverging effect becomes too strong, and it becomes difficult to correct the aberration of the peripheral portion of the screen.

(f2 / f) is lower than the lower limit value of the equation (4), the refracting power of the second lens G2 becomes weak, the diverging effect becomes weak, and it becomes difficult to increase the angle of incidence of the off-axis light.

Formula 5 defines the ratio of the focal length of the third lens G3 to the focal length of the photographing lens. (f3 / f) exceeds the upper limit value of the equation (5), the refracting power of the third lens (G3) becomes weak and it is difficult to correct the off-axis light emitted from the second lens (G2) It can be difficult.

If f3 / f is lower than the lower limit value of the expression (5), the refractive power of the third lens G3 becomes strong and the convergence action becomes too strong, so that the length of the entire optical system must be increased to secure a desired image height.

Equation 6 defines the ratio of the focal length of the fourth lens G4 to the focal length of the photographing lens. (f4 / f) exceeds the upper limit value of the formula (6), the refracting power of the fourth lens (G4) is weakened and the convergence of the light can not be sufficiently performed in the fourth lens (G4). On the upper surface It becomes difficult to secure the angle of incidence of the light ray.

(f4 / f) is lower than the lower limit value of the equation (6), the refracting power of the fourth lens G4 becomes strong, and the converging action becomes too strong, and correction of astigmatism or the like becomes difficult.

Equation 7 defines the ratio of the focal length of the fifth lens G5 to the focal length of the photographing lens.

(f5 / f) exceeds the upper limit value of the equation (7), the refracting power of the fifth lens G5 becomes strong, the diverging effect becomes too strong, and it becomes difficult to secure the incidence angle characteristic on the upper surface.

If f5 / f is lower than the lower limit value of the equation (7), the refracting power of the fifth lens G5 becomes weak, the diverging effect becomes weak, and it becomes difficult to correct the astigmatism near the center of the screen.

For example, the first through fifth lenses may satisfy the following expressions.

0.80 < f1 / f < 1.1 <

-1.7 < f2 / f < -1.0 <

1.5 < f3 / f < 3.3 <

0.5 < f4 / f < 0.8 <

-0.65 < f5 / f < -0.4 <

Meanwhile, the first lens G1, the third lens G3, the fourth lens G4 and the fifth lens may be formed of the same material. For example, the first through fifth lenses may satisfy the following expressions.

? d1345> 50.0 <Formula 8>

vd2 < 25.0 <

Here, vd1345 represents the Abbe number of the d-line of the first lens G1, the third lens G3, the fourth lens G4 and the fifth lens G5, and vd2 represents the Abbe number of the second lens G2 d &lt; / RTI &gt;

By forming the first lens G1, the third lens G3, the fourth lens G4 and the fifth lens G5 with the same material and for a time with glass or resin, the chromatic aberration can be satisfactorily corrected, .

For example, all of the first to fifth lenses may be formed of a plastic lens, and the first lens G1, the third lens G3, the fourth lens G4, and the fifth lens G5 may be formed of the same plastic material The change in the refractive index and the change in the shape due to the temperature change are offset by each other in each lens, so that deterioration in performance can be reduced.

Equation 8 defines the Abbe number of the first lens G1, the third lens G3, the fourth lens G4 and the fifth lens G5.

(vd1345) is smaller than the lower limit of the expression (8), it becomes difficult to correct the axial and magnification chromatic aberrations.

Equation 9 defines the Abbe number of the second lens G2. (? d2) exceeds the upper limit of the formula (9), the dispersing action of the second lens is not sufficiently achieved, and it becomes difficult to correct the axial chromatic aberration and the chromatic aberration of magnification.

For example, the first through fifth lenses may satisfy the following expressions.

? d1345> 53.0 <Formula 8a>

? d2 <23.0 <Formula 9a>

The photographing lens according to the embodiment of the present invention can satisfy the following expression.

D34t < D3t <

1.0 < (r41 + r42) / (r41-r42) < 3.0 &

-0.8 < (r51 + r52) / (r51-r52) < 3.0 &

D3t is the thickness on the optical axis of the third lens G3 and r41 is the thickness of the third lens G3 on the object side of the fourth lens G4. R51 denotes a paraxial radius of curvature of the object side surface of the fifth lens G5 and r52 denotes a paraxial radius of curvature of the fifth lens G5. And the paraxial radius of curvature of the upper surface.

Equation 10 defines the relationship between the air gap on the optical axis of the third lens G3 and the fourth lens G4 and the thickness on the optical axis of the third lens G3 for the purpose of downsizing the photographing lens.

If the distance between the third lens G3 and the fourth lens G4 is widened beyond the upper limit of the expression (10), the entire thickness of the optical axis is increased and the miniaturization becomes difficult.

Equation 11 defines the paraxial radius of curvature of the object side surface of the fourth lens G4 and the paraxial radius of curvature of the image side.

When [(r41 + r42) / (r41-r42)] exceeds the upper limit of the expression (11), the curvature of the object side surface becomes larger but the curvature of the upper side surface becomes loose. As a result, the angle of incidence of light on the object-side surface of the fifth lens G5 becomes too small and it is difficult to downsize the entire length when the desired image height is secured.

If [r41 + r42) / (r41-r42)] is lower than the lower limit of the expression (11), the sign of the curvature of the object side surface may be changed to be a biconvex shape and the convergence action becomes too strong, Aberration correction becomes difficult.

Equation (12) defines the paraxial radius of curvature of the object-side surface of the fifth lens G5 and the paraxial radius of curvature of the image-side surface.

When the [(r51 + r52) / (r51-r52)] exceeds the upper limit of the expression (12), the fifth lens has a convex shape by changing the curvature sign of the object side surface, and the negative power of the fifth lens The load on the curvature of the upper surface is increased. Therefore, the sensitivity of eccentricity is increased, and as a result, performance deterioration due to deviation during manufacturing may occur to a large extent.

When [(r51 + r52) / (r51-r52)] is smaller than the lower limit of the expression (12), the curvature of the object side becomes larger while the curvature of the upper side becomes smaller. As a result, it becomes difficult to secure the angle of incidence angle of light on the upper surface.

For example, the photographing lens according to the embodiment of the present invention can satisfy the following expression.

1.15 < (r41 + r42) / (r41-r42) < 2.5 &

-0.5 < (r51 + r52) / (r51-r52) < 1.5 &

The embodiment of the present invention includes five lenses, and by appropriately configuring the shape and curvature of the lens, it is possible to realize a photographing lens having a small Fno, small size, and high imaging performance.

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.

expression First Embodiment Second Embodiment Third Embodiment Fourth Embodiment Fifth Embodiment Sixth Embodiment Seventh Embodiment Eighth Embodiment (1) -1.085 -1.986 -1.013 -1.015 -1.022 -1.020 -1.021 -1.019 (2) -5.392 -3.465 -6.056 -3.175 -8,000 -5.188 -6.181 -2,269 (3) 0.909 0.929 1.078 0.800 0.890 0.891 0.909 0.858 (4) -1,295 -1.560 -1.647 -0.903 -1.348 -1.213 -1,272 -1.180 (5) 2.246 2.013 2.295 1.500 3.259 2.064 2.491 1.536 (6) 0.616 0.547 0.609 0.739 0.617 0.580 0.794 0.655 (7) -0.484 -0.406 -0.503 -0.553 -0.504 -0.444 -0.650 -0.482 (11) 1.285 1.156 1.220 1.789 1.196 1.159 1.464 2.459 (12) 0.952 0.801 0.999 0.670 0.962 -0.534 1.500 1,000

In each embodiment, the surface number (i) 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 surface interval between the i-th surface and the i + 1th surface, ndi and vdi are the refractive indexes of the i- .

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

The unit of length is mm.

Assuming that x is the conic constant, K is the conic constant, A4 is the aspheric coefficient, A6, A8, A10 and A12 are the aspheric coefficients, and x is the displacement of the plane in the direction of the optical axis at the height h from the optical axis, As follows.

<식 13>

Equation (13)

Where R is the radius of curvature. In the following table, the indication of "EZ" means "10- ^Z ". f denotes a focal length, Fno denotes an F number, and? denotes a half angle of view.

(Example 1)

Table 2 shows the first embodiment. Fig. 1 shows the photographing lens of the first embodiment. 2 is an aberration view of the first embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 4.100 1.540 1.53113 55.75 2* -27.740 0.000 3 (aperture) ∞ 0.451 4* -6.112 0.600 1.65055 21.53 5 * -150 0.596 6 * 3.342 0.830 1.53113 55.75 7 * 4.864 0.825 8* -17.773 1.400 1.53113 55.75 9 * -2.220 0.578 10 * -80.323 0.600 1.53113 55.75 11 * 1.988 0.580 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the first embodiment.

The first side K = 0 A4 = -1.453E-03 A6 = -6.60E-04 A8 = 1.490E-04 A10 = -4.930E-05 Second side K = 0 A4 = -3.742E-03 A6 = -6.400E-04 A8 = -4.103E-04 A10 = 5.289E-05 4th face K = 0 A4 = 5.932E-03 A6 = -8.339E-04 A8 = -5.829E-04 A10 = 1.183E-04 Fifth face K = 0 A4 = -2.380E-03 A6 = 1.889E-03 A8 = -5.921E-04 A10 = 6.452E-05 6th face K = 0 A4 = -1.770E-02 A6 = 8.480E-04 A8 = -1.080E-04 A10 = -4.340E-06 Seventh face K = 0 A4 = -2.625E-03 A6 = -2.520E-03 A8 = 3.209E-04 A10 = -3.026E-05 8 K = 0 A4 = 8.875E-03 A6 = -1.569E-03 A8 = -1.122E-04 A10 = -5.645E-06 Ninth plane K = -6.040E + 00 A4 = -8.283E-03 A6 = 3.113E-03 A8 = -7.163E-04 A10 = 4.476E-05 10 K = 6.600E-05 A4 = -2.730E-02 A6 = 2.464E-03 A8 = -3.368E-04 A10 = 1.687E-05 Eleventh plane K = -6.731E + 00 A4 = -1.562E-02 A6 = 1.476E-03 A8 = -1.220E-04 A10 = 4.887E-06 A12 = -7.650E-08

The following are various design data of the first embodiment.

Focal length 7.501 F number 1.87 Half angle of view (°) 33.29 Appeal 4.840 Lens Length 9.500 BF 1.978

FIG. 2 illustrates spherical aberration, astigmatic aberration, and distortion of the photographing lens according to the first embodiment of the present invention. The astigmatism shows astigmatism of the meridional plane (?) And astigmatism of the top surface (?) Of the sagittal plane. Hereinafter, such an aberration diagram is shown in each embodiment.

(Example 2)

Table 5 shows the second embodiment. Fig. 3 shows the photographing lens of the second embodiment. 4 is an aberration diagram of the second embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 3.944 1.340 1.53113 55.75 2* -57.261 0.000 3 (aperture) ∞ 0.628 4* -5.039 0.600 1.65055 21.53 5 * -15.262 0.785 6 * 3.954 0.880 1.53113 55.75 7 * 7.162 0.830 8* -28.546 1.390 1.53113 55.75 9 * -2.069 0.307 10 * -16.537 0.600 1.53113 55.75 11 * 1.827 0.588 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the second embodiment.

The first side K = 0 A4 = -1.049E-03 A6 = -7.837E-04 A8 = 2.337E-04 A10 = -6.700E-05 Second side K = 0 A4 = -4.193E-03 A6 = -5.698E-05 A8 = -4.050E-04 A10 = 3.217E-05 4th face K = 0 A4 = 1.942E-03 A6 = 2.537E-04 A8 = -4.834E-04 A10 = 8.472E-05 Fifth face K = 0 A4 = -1.563E-03 A6 = 5.521E-04 A8 = -1.190E-04 A10 = 1.388E-05 6th face K = 0 A4 = -6.483E-03 A6 = -8.276E-04 A8 = 1.728E-04 A10 = -2.291E-05 Seventh face K = 0 A4 = 5.281E-03 A6 = -2.974E-03 A8 = 3.122E-04 A10 = -2.674E-05 8 K = 0 A4 = 1.238E-02 A6 = -2.145E-03 A8 = -1.827E-04 A10 = -5.236E-05 Ninth plane K = -8.418E + 00 A4 = -1.852E-03 A6 = 4.205E-03 A8 = -8.505E-04 A10 = 4.091E-05 10 K = 1.288E-01 A4 = -1.715E-02 A6 = 1.599E-03 A8 = -1.710E-04 A10 = 8.109E-06 Eleventh plane K = -8.018E + 00 A4 = -1.319E-02 A6 = 1.234E-03 A8 = -1.202E-04 A10 = 6.662E-06 A12 = -1.466E-07

The following are various design data of the second embodiment.

Focal length 7.505 F number 1.88 Half angle of view (°) 33.21 Appeal 4.840 Lens Length 9.448 BF 1.985

(Example 3)

Table 8 shows the third embodiment. 5 shows the photographing lens of the third embodiment. 6 is an aberration view of the third embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 3.948 1.380 1.53113 55.75 2* 43.458 0.000 3 (aperture) ∞ 0.624 4* -8.030 0.600 1.65055 21.53 5 * -1243 0.473 6 * 3.195 0.850 1.53113 55.75 7 * 4.459 0.830 8* -22.569 1.450 1.53113 55.75 9 * -2,239 0.584 10 * -6020 0.600 1.53113 55.75 11 * 2.004 0.599 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.210 Top surface ∞

The following is the aspherical surface data of the third embodiment.

The first side K = 0 A4 = -1.140E-03 A6 = -7.118E-04 A8 = 1.553E-04 A10 = -4.575E-05 Second side K = 0 A4 = -3.511E-03 A6 = -5.492E-04 A8 = -4.195E-04 A10 = 4.670E-05 4th face K = 0 A4 = 5.297E-03 A6 = -1.027E-03 A8 = -5.919E-04 A10 = 1.173E-04 Fifth face K = 0 A4 = -2.201E-03 A6 = 1.701E-03 A8 = -5.891E-04 A10 = 6.948E-05 6th face K = 0 A4 = -1.781E-02 A6 = -8.162E-04 A8 = -9.089E-05 A10 = -4.138E-06 Seventh face K = 0 A4 = -2.229E-03 A6 = -2.592E-03 A8 = 3.439E-04 A10 = -2.957E-05 8 K = 0 A4 = 9.519E-03 A6 = -1.379E-03 A8 = -1.232E-04 A10 = -1.887E-06 Ninth plane K = -6.041E + 00 A4 = -7.977E-03 A6 = 3.356E-03 A8 = -7.410E-04 A10 = 4.621E-05 10 K = 3.712E-08 A4 = -2.614E-02 A6 = 2.507E-03 A8 = -3.551E-04 A10 = 1.988E-05 Eleventh plane K = -6.420E + 00 A4 = -1.561E-02 A6 = 1.475E-03 A8 = -1.185E-04 A10 = 4.732E-06 A12 = -7.376E-08

The following are various design data of the third embodiment.

Focal length 7.462 F number 1.87 Half angle of view (°) 33.41 Appeal 4.840 Lens Length 9.500 BF 2.007

(Example 4)

Table 11 shows the fourth embodiment. 7 shows the photographing lens of the fourth embodiment. 8 is an aberration view of the fourth embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 4.044 1.420 1.53113 55.75 2* -13,351 0.000 3 (aperture) ∞ 0.475 4* -4.408 0.800 1.65055 21.53 5 * -600 0.383 6 * 3.177 0.900 1.53113 55.75 7 * 6.097 0.766 8* -8.082 1.330 1.53113 55.75 9 * -2,286 0.862 10 * -13.571 0.600 1.53113 55.75 11 * 2.680 0.465 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the fourth embodiment.

The first side K = 0 A4 = -1.264E-03 A6 = -7.988E-04 A8 = 2.421E-04 A10 = -7.125E-05 Second side K = 0 A4 = 7.279E-04 A6 = -2.766E-04 A8 = -5.515E-04 A10 = 5.349E-05 4th face K = 0 A4 = 1.948E-02 A6 = -3.047E-03 A8 = -2.295E-04 A10 = 8.354E-05 Fifth face K = 0 A4 = -4.074E-03 A6 = 2.949E-03 A8 = -8.972E-04 A10 = 9.648E-05 6th face K = 0 A4 = -2.699E-02 A6 = -1.905E-03 A8 = -4.917E-04 A10 = 2.488E-05 Seventh face K = 0 A4 = 2.184E-03 A6 = -4.146E-03 A8 = 4.164E-04 A10 = -3.940E-05 8 K = 0 A4 = 9.694E-03 A6 = -1.003E-03 A8 = -2.442E-04 A10 = -4.098E-06 Ninth plane K = -4.893E + 00 A4 = -1.335E-02 A6 = 3.652E-03 A8 = -7.289E-04 A10 = 4.310E-05 10 K = -5.136E-02 A4 = -2.374E-02 A6 = 1.666E-03 A8 = -2.193E-04 A10 = 9.092E-07 Eleventh plane K = -8.965E + 00 A4 = -1.523E-02 A6 = 1.367E-03 A8 = -1.257E-04 A10 = 4.994E-06 A12 = -7.206E-08

The following are various design data of the fourth embodiment.

Focal length 7.486 F number 1.87 Half angle of view (°) 33.33 Appeal 4.840 Lens Length 9.500 BF 1.862

(Example 5)

Table 14 shows the fifth embodiment. 9 shows the photographing lens of the fifth embodiment. 10 is an aberration view of the fifth embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 4.070 1.550 1.53113 55.75 2* -24.314 0.000 3 (aperture) ∞ 0.444 4* -6.563 0.600 1.65055 21.53 5 * -600 0.620 6 * 3.654 0.790 1.53113 55.75 7 * 4.698 0.693 8* -25.676 1.470 1.53113 55.75 9 * -2,294 0.652 10 * -107.285 0.600 1.53113 55.75 11 * 2.057 0.581 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the fifth embodiment.

The first side K = 0 A4 = -1.366E-03 A6 = -6.384E-04 A8 = 1.608E-04 A10 = -5.272E-05 Second side K = 0 A4 = -3.655E-03 A6 = -5.715E-04 A8 = -4.131E-04 A10 = 5.144E-05 4th face K = 0 A4 = 4.826E-03 A6 = -8.496E-04 A8 = -5.772E-04 A10 = 1.218E-04 Fifth face K = 0 A4 = -1.689E-03 A6 = 1.579E-03 A8 = -5.909E-04 A10 = 7.184E-05 6th face K = 0 A4 = -1.816E-02 A6 = 6.623E-04 A8 = -7.566E-05 A10 = -7.125E-06 Seventh face K = 0 A4 = -4.732E-03 A6 = -2.556E-03 A8 = 3.243E-04 A10 = -3.192E-05 8 K = 0 A4 = 9.497E-03 A6 = -1.639E-03 A8 = -1.331E-04 A10 = -1.866E-06 Ninth plane K = -5.975E + 00 A4 = -8.912E-03 A6 = 3.280E-03 A8 = -7.437E-04 A10 = 4.725E-05 10 K = 1.549E-04 A4 = -2.677E-02 A6 = 2.463E-03 A8 = -3.603E-04 A10 = 1.855E-05 Eleventh plane K = -6.569E + 00 A4 = -1.522E-02 A6 = 1.412E-03 A8 = -1.186E-04 A10 = 4.749E-06 A12 = -7.443E-08

The following are various design data of the fifth embodiment.

Focal length 7.489 F number 1.87 Half angle of view (°) 33.31 Appeal 4.840 Lens Length 9.500 BF 1.979

(Example 6)

Table 17 shows the sixth embodiment. 11 shows the photographing lens of the sixth embodiment. 12 is an aberration view of the sixth embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 4.171 1.560 1.53113 55.75 2* -21.305 0.000 3 (aperture) ∞ 0.452 4* -5.920 0.600 1.65055 21.53 5 * -600 0.587 6 * 3.176 0.830 1.53113 55.75 7 * 4.693 0.800 8* -29.682 1.480 1.53113 55.75 9 * -2.188 0.777 10 * -2.362 0.600 1.53113 55.75 11 * 7.787 0.313 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the sixth embodiment.

The first side K = 0 A4 = -1.375E-03 A6 = -6.011E-04 A8 = 1.447E-04 A10 = -4.706E-05 Second side K = 0 A4 = -2.173E-03 A6 = -5.832E-04 A8 = -4.442E-04 A10 = 5.117E-05 4th face K = 0 A4 = 7.991E-03 A6 = -9.641E-04 A8 = -6.472E-04 A10 = 1.141E-04 Fifth face K = 0 A4 = -2.810E-03 A6 = 2.123E-03 A8 = -6.564E-04 A10 = 6.648E-05 6th face K = 0 A4 = -1.865E-02 A6 = 9.913E-04 A8 = -1.235E-04 A10 = -1.869E-08 Seventh face K = 0 A4 = -3.072E-03 A6 = -2.242E-03 A8 = 2.795E-04 A10 = -2.850E-05 8 K = 0 A4 = 4.275E-04 A6 = 3.206E-04 A8 = -1.842E-04 A10 = -1.070E-05 Ninth plane K = -4.789E + 00 A4 = -1.432E-02 A6 = 4.780E-03 A8 = -7.789E-04 A10 = 4.104E-05 10 K = -6.210E + 00 A4 = -1.045E-02 A6 = 6.585E-04 A8 = -2.012E-04 A10 = 2.408E-06 Eleventh plane K = 6.878E-01 A4 = -1.158E-02 A6 = 8.186E-04 A8 = -8.380E-05 A10 = 3.277E-06 A12 = -4.327E-08

The following are various design data of the sixth embodiment.

Focal length 7.498 F number 1.87 Half angle of view (°) 33.25 Appeal 4.840 Lens Length 9.500 BF 1.711

(Example 7)

Table 20 shows the seventh embodiment. 13 shows the photographing lens of the seventh embodiment. 14 is an aberration view of the seventh embodiment.

Lens face r d nd υd Object surface ∞ ∞ One* 4.018 1.470 1.53113 55.75 2* -33.061 0.000 3 (aperture) ∞ 0.449 4* -6.201 0.600 1.65055 21.53 5 * -600 0.522 6 * 3.342 0.760 1.53113 55.75 7 * 4.632 0.758 8* -14.237 1.350 1.53113 55.75 9 * -2.679 0.773 10 * 10.069 0.720 1.53113 55.75 11 * 2.014 0.597 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the seventh embodiment.

The first side K = 0 A4 = -1.272E-03 A6 = -7.019E-04 A8 = 1.878E-04 A10 = -5.717E-05 Second side K = 0 A4 = -3.252E-03 A6 = -4.515E-04 A8 = -4.744E-04 A10 = 5.558E-05 4th face K = 0 A4 = 7.435E-03 A6 = -1.082E-03 A8 = -5.694E-04 A10 = 1.180E-04 Fifth face K = 0 A4 = -2.464E-03 A6 = 1.917E-03 A8 = -6.218E-04 A10 = 6.967E-05 6th face K = 0 A4 = -2.085E-02 A6 = 4.616E-04 A8 = -1.069E-04 A10 = -3.290E-06 Seventh face K = 0 A4 = -2.841E-03 A6 = -3.601E-03 A8 = 4.934E-04 A10 = -4.589E-05 8 K = 0 A4 = 9.911E-03 A6 = -2.785E-03 A8 = 1.435E-04 A10 = -2.111E-05 Ninth plane K = -6.629E + 00 A4 = -1.420E-02 A6 = 3.086E-03 A8 = -5.942E-04 A10 = 4.071E-05 10 K = 1.094E-02 A4 = -4.281E-02 A6 = 4.368E-03 A8 = -3.384E-04 A10 = 1.178E-05 Eleventh plane K = -5.183E + 00 A4 = -2.005E-02 A6 = 2.258E-03 A8 = -1.871E-04 A10 = 7.971E-06 A12 = -1.408E-07

The following are various design data of the seventh embodiment.

Focal length 7.493 F number 1.87 Half angle of view (°) 33.30 Appeal 4.840 Lens Length 9.500 BF 1.995

(Example 8)

Table 23 shows an eighth embodiment. Fig. 15 shows the photographing lens of the eighth embodiment. 16 is an aberration view of the eighth embodiment.

Face number r d nd υd Object surface ∞ ∞ One* 4.033 1.470 1.53113 55.75 2* -20.091 0.000 3 (aperture) ∞ 0.470 4* -5.764 0.600 1.65055 21.53 5 * -600 0.574 6 * 3.949 0.890 1.53113 55.75 7 * 10.172 0.834 8* -4.247 1.280 1.53113 55.75 9 * -1.791 0.576 10 * -11755 0.700 1.53113 55.75 11 * 1.927 0.604 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top surface ∞

The following is the aspherical surface data of the eighth embodiment.

The first side K = 0 A4 = -1.814E-03 A6 = -6.805E-04 A8 = 1.399E-04 A10 = -6.015E-05 Second side K = 0 A4 = -2.928E-03 A6 = -6.194E-04 A8 = -4.257E-04 A10 = 4.884E-05 4th face K = 0 A4 = 7.982E-03 A6 = -6.497E-04 A8 = -5.815E-04 A10 = 1.134E-04 Fifth face K = 0 A4 = -3.242E-03 A6 = 1.933E-03 A8 = -5.643E-04 A10 = 5.448E-05 6th face K = 0 A4 = -1.864E-02 A6 = 4.787E-04 A8 = -1.642E-04 A10 = -1.401E-05 Seventh face K = 0 A4 = 2.786E-04 A6 = -2.883E-03 A8 = 2.854E-04 A10 = -3.719E-05 8 K = 0 A4 = 1.222E-02 A6 = -1.449E-03 A8 = -1.396E-04 A10 = -1.283E-06 Ninth plane K = -3.817E + 00 A4 = -1.194E-02 A6 = 3.362E-03 A8 = -7.116E-04 A10 = 4.989E-05 10 K = -5.674E-09 A4 = -2.367E-02 A6 = 2.369E-03 A8 = -3.634E-04 A10 = 2.046E-05 Eleventh plane K = -6.846E + 00 A4 = -1.380E-02 A6 = 1.253E-03 A8 = -1.115E-04 A10 = 5.128E-06 A12 = -9.891E-08

The following are various design data of the eighth embodiment.

Focal length 7.502 F number 1.88 Half angle of view (°) 33.24 Appeal 4.840 Lens Length 9.498 BF 2.002

As described above, the photographing lens according to the embodiment of the present invention includes a five-sheet lens and appropriately configures the shape and curvature of each lens, so that Fno is small, small and has high image forming performance. The photographing lens according to the embodiment of the present invention can be applied to, for example, a video camera, a digital still camera, a mobile phone with a camera, an information portable terminal, or the like.

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 electrical image signal. The photographing lens 100 is the same as that described with reference to Figs. The photographing apparatus has a housing 110 capable of attaching and detaching the photographing lens 100 as a replacement lens, and the photographing element is provided in the housing 110. [ The photographing apparatus may include a recording means 113 in which information corresponding to the photoelectrically-converted object from the photographing element 112 is recorded, and a finder 114 for observing a subject image. In addition, a display unit 115 for displaying a subject image 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 can be provided without a viewfinder. The photographing apparatus shown in Fig. 17 is merely an example, and the present invention is not limited thereto, and can be applied to a camera, a mobile optical apparatus, 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, it is possible to realize a photographing apparatus capable of photographing in a small size, bright, and high performance.

The above-described embodiments are merely illustrative, and various modifications and equivalent other embodiments are possible without departing from the scope of the present invention. Therefore, the scope of the true technical protection according to the embodiment of the present invention should be determined by the technical idea of the invention described in the following claims.

G1 first lens, G2 second lens,
G3 ... third lens, G4 ... fourth lens,
G5 ... fifth lens, SP ... aperture
IP ... image plane △ surface ... meridional image plane,
△ S ... Sagittal top surface, ω ... Half angle of view,
Fno ... F number

Claims (17)

Arranged in order from the object side to the image side,
A first lens having a convex surface on the object side and having a positive refractive power;
A second lens having a convex surface on the image side and having a negative refractive power;
A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power;
A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And
And a fifth lens having a concave surface on the image side in the vicinity of the optical axis and having a negative refracting power, and satisfying the following expression.
<Expression>
-3.0 <(r21 + r22) / (r21-r22) <1.0
-10.0 < (r31 + r32) / (r31-r32) < - 1.5
Wherein r21 is a paraxial radius of curvature of the object side surface of the second lens, r22 is a paraxial radius of curvature of the upper surface of the second lens, r31 is a paraxial radius of curvature of the object side surface of the third lens, 3 is the paraxial radius of curvature of the upper surface of the lens. The method according to claim 1,
Wherein the first lens and the second lens satisfy the following expressions.
<Expression>
0.75 < f1 / f < 1.4
-2.0 < f2 / f < -0.7
Here, f represents the focal length of the photographing lens, f1 represents the focal length of the first lens, and f2 represents the focal length of the second lens. 3. The method according to claim 1 or 2,
Wherein the third lens and the fourth lens satisfy the following expression.
<Expression>
1.2 < f3 / f < 3.8
0.4 < f4 / f < 1.0
Here, f is the focal length of the photographing lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. 3. The method according to claim 1 or 2,
Wherein the fifth lens satisfies the following expression.
<Expression>
-0.85 < f5 / f < -0.3
Here, f represents the focal length of the photographing lens, and f5 represents the focal length of the fifth lens. 5. The method of claim 4,
And the fifth lens has a concave shape in the vicinity of the optical axis. 3. The method according to claim 1 or 2,
Wherein an upper surface of the second lens has no inflection point. 3. The method according to claim 1 or 2,
Wherein an upper surface of the fifth lens has at least one inflection point other than an intersection with an optical axis. 3. The method according to claim 1 or 2,
Wherein the first lens, the third lens, the fourth lens, and the fifth lens are formed of the same material. 3. The method according to claim 1 or 2,
A photographic lens satisfying the following expression.
<Expression>
? d1345> 50.0
Here, vd1345 represents the Abbe number with respect to the d line of the first lens, the third lens, the fourth lens, and the fifth lens. 3. The method according to claim 1 or 2,
A photographic lens satisfying the following expression.
<Expression>
vd2 < 25.0
Here, vd2 represents the Abbe number with respect to the d line of the second lens. 3. The method according to claim 1 or 2,
A photographic lens satisfying the following expression.
<Expression>
D34t < D3t
Here, D34t represents the air-space distance on the optical axis between the third lens and the fourth lens, and D3t represents the thickness on the optical axis of the third lens. 3. The method according to claim 1 or 2,
A photographic lens satisfying the following expression.
<Expression>
1.0 < (r41 + r42) / (r41 - r42) < 3.0
Here, r41 represents the radius of paraxial curvature of the object side surface of the fourth lens, and r42 represents the paraxial radius of curvature of the upper surface of the fourth lens. 3. The method according to claim 1 or 2,
A photographic lens satisfying the following expression.
<Expression>
-0.8 < (r51 + r52) / (r51-r52) < 3.0
Here, r51 is the radius of paraxial curvature of the object-side surface of the fifth lens, and r52 is a paraxial radius of curvature of the upper surface of the fifth lens. An image pickup apparatus comprising: the photographing lens according to claim 1 or 2; And
And a photographing element for receiving the optical image formed by the photographing lens and converting it into an electric image signal. 15. The method of claim 14,
Wherein the third lens and the fourth lens satisfy the following equations.
<Expression>
1.2 < f3 / f < 3.8
0.4 < f4 / f < 1.0
Here, f is the focal length of the photographing lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. 15. The method of claim 14,
Wherein the fifth lens satisfies the following expression.
<Expression>
-0.85 < f5 / f < -0.3
Here, f represents the focal length of the photographing lens, and f5 represents the focal length of the fifth lens. 17. The method of claim 16,
And the fifth lens has a concave shape in the vicinity of the optical axis.

Images