KR20230078467A - Optical imaging system - Google Patents

Abstract

The present invention relates to an optical imaging system which has a reduced size while implementing high resolution. According to one embodiment of the present invention, the optical imaging system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in order from the object side. The first lens has positive refractive power, the second lens has negative refractive power, and TTL / (2 × IMG HT) < 0.6 and -0.15 < SAG52 / f < 0 can be satisfied, wherein TTL is an optical axis distance from an object side surface of the first lens to an imaging surface, IMG HT is half of the diagonal length of the imaging surface, and SAG52 is a SAG value at the end of the effective diameter of an imaging surface of the fifth lens, and f is the total focal length of the first to seventh lenses.

Description

Imaging optical system {Optical imaging system}

The present invention relates to an imaging optical system.

Recent portable terminals are equipped with a camera including an imaging optical system composed of a plurality of lenses to enable video calls and photo taking.

In addition, as the function occupied by a camera in a portable terminal gradually increases, the demand for a camera for a portable terminal having a high resolution is increasing.

In particular, in recent years, an image sensor having high pixels (eg, 13 million to 100 million pixels, etc.) has been employed in a camera for a portable terminal in order to implement a clearer picture quality.

That is, the size of the image sensor is gradually increasing, and accordingly, the total track length of the imaging optical system is also increased, resulting in a problem in that the camera protrudes from the portable terminal.

Since portable terminals are gradually miniaturized and slimmer cameras for portable terminals are required, development of an imaging optical system capable of realizing high resolution while being slim is required.

An object according to an embodiment of the present invention is to provide an imaging optical system capable of implementing high resolution and having a small length of the entire optical system.

An imaging optical system according to an embodiment of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from the object side, The first lens has a positive refractive power, the second lens has a negative refractive power, and TTL/(2×IMG HT) < 0.6; and -0.15 < SAG52/f < 0; Here, TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface, IMG HT is half of the diagonal length of the imaging surface, and SAG52 is the SAG value at the end of the effective diameter of the image-side surface of the fifth lens. , f is the total focal length of the first lens to the seventh lens.

According to the imaging optical system according to an embodiment of the present invention, the size can be reduced while implementing high resolution.

1 is a configuration diagram of an imaging optical system according to a first embodiment of the present invention.
FIG. 2 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 1 .
3 is a configuration diagram of an imaging optical system according to a second embodiment of the present invention.
FIG. 4 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 3 .
5 is a configuration diagram of an imaging optical system according to a third embodiment of the present invention.
6 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 5;
7 is a configuration diagram of an imaging optical system according to a fourth embodiment of the present invention.
FIG. 8 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 7 .
9 is a configuration diagram of an imaging optical system according to a fifth embodiment of the present invention.
FIG. 10 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 9 .
11 is a configuration diagram of an imaging optical system according to a sixth embodiment of the present invention.
FIG. 12 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 11;
13 is a configuration diagram of an imaging optical system according to a seventh embodiment of the present invention.
14 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 13;
15 is a configuration diagram of an imaging optical system according to an eighth embodiment of the present invention.
16 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 15;
17 is a configuration diagram of an imaging optical system according to a ninth embodiment of the present invention.
18 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 17;
19 is a configuration diagram of an imaging optical system according to a tenth embodiment of the present invention.
20 is a diagram showing aberration characteristics of the imaging optical system shown in FIG. 19;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented examples.

For example, those skilled in the art who understand the spirit of the present invention may easily suggest other embodiments included in the scope of the spirit of the present invention by adding, changing, or deleting components, but this is also the spirit of the present invention. will be said to be within the scope of

In addition, throughout the specification, 'including' a certain element means that other elements may be further included, rather than excluding other elements unless otherwise stated.

In the following lens configuration diagram, the thickness, size, and shape of the lens are somewhat exaggerated for description, and in particular, the spherical or aspherical shape presented in the lens configuration diagram is only presented as an example and is not limited thereto.

The first lens means a lens closest to the object side, and the seventh lens means a lens closest to the imaging plane (or image sensor).

Further, in each lens, the first surface means a surface close to the object side (or object-side surface), and the second surface means a surface close to the image side (or image side surface). In addition, in this specification, values for the radius of curvature, thickness, distance, and focal length of the lens are all units of mm, and the unit of the angle of view (FOV) is degree.

In addition, in the description of the shape of each lens, the meaning that one side is convex means that the paraxial region portion of the corresponding side is convex, and the meaning that one side is concave means that the paraxial region portion of the corresponding side is concave. The plane means that the paraxial region portion of the plane is plane. Therefore, even if one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Likewise, even if one surface of the lens is described as having a concave shape, the edge portion of the lens may be convex. Also, even if one surface of the lens is described as being flat, an edge portion of the lens may be convex or concave.

Meanwhile, the paraxial region means a very narrow region near an optical axis.

The imaging plane may refer to a virtual plane on which a focus is formed by an imaging optical system. Alternatively, the imaging surface may refer to one surface of an image sensor through which light is received.

An imaging optical system according to an embodiment of the present invention includes 7 lenses.

For example, an imaging optical system according to an embodiment of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from the object side. include The first to seventh lenses are spaced apart from each other by a predetermined distance along the optical axis.

However, the imaging optical system according to an embodiment of the present invention is not composed of only 7 lenses and may further include other components as needed.

For example, the imaging optical system may further include an image sensor for converting an incident image of a subject into an electrical signal.

In addition, the imaging optical system may further include an infrared filter (hereinafter referred to as 'filter') for blocking infrared rays. A filter is disposed between the seventh lens and the image sensor.

In addition, the imaging optical system may further include a diaphragm for adjusting the amount of light.

The first to seventh lenses constituting the imaging optical system according to an embodiment of the present invention may be made of a plastic material.

In addition, at least one of the first to seventh lenses has an aspherical surface. Also, each of the first to seventh lenses may have at least one aspherical surface.

That is, at least one of the first and second surfaces of the first to seventh lenses may be an aspherical surface. Here, the aspheric surfaces of the first to seventh lenses are expressed by Equation 1.

In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the conic constant, and Y represents the distance from an arbitrary point on the aspheric surface of the lens to the optical axis. In addition, the constants A to P mean aspherical surface coefficients. And Z(SAG) represents the distance in the direction of the optical axis between an arbitrary point on the aspherical surface of the lens and the apex of the aspheric surface.

An imaging optical system according to an embodiment of the present invention may satisfy at least one of the following conditional expressions.

[Conditional Expression 1] 0 < f1/f < 1.4

[Conditional Expression 2] 25 < v1-v2 < 45

[Conditional expression 3] 25 < v1-v4 < 45

[Conditional Expression 4] 15 < v1-v6 < 25

[Conditional Expression 5] -10 < f2/f < 0

[Conditional Expression 6] 0 < f3/f < 50

[Conditional Expression 7] -50 < f4/f < 0

[Conditional Expression 8] |f5/f| > 3

[Conditional Expression 9] 0 < f6/f < 1.4

[Conditional Expression 10] -0.9 < f7/f < 0

[Conditional Expression 11] TTL/f < 1.3

[Conditional Expression 12] -0.6 < f1/f2 < 0

[Conditional Expression 13] 0 < f1/f3 < 0.4

[Conditional Expression 14] BFL / f < 0.3

[Conditional Expression 15] D1/f < 0.1

[Conditional Expression 16] TTL/(2×IMG HT) < 0.6

[Conditional Expression 17] FOV×((2×IMG HT)/f) ≤ 170°

[Conditional Expression 18] (TTL/(2×IMG HT))×(TTL/f) < 0.62

[Conditional Expression 19] n2+n4+n5 > 4.8

[Conditional Expression 20] -0.15 < SAG52/f < 0

[Conditional Expression 21] -0.15 < SAG62/f < 0

[Conditional Expression 22] -0.25 < SAG72/f < 0

In the conditional expressions, f is the total focal length of the imaging optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens distance, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v4 is the Abbe number of the fourth lens, and v6 is the Abbe number of the sixth lens.

n2 is the refractive index of the second lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens.

TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface, and BFL is the distance on the optical axis from the image-side surface of the seventh lens to the imaging surface.

D1 is the distance on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens, IMG HT is half of the diagonal length of the imaging surface, and FOV is the angle of view of the imaging optical system.

SAG52 is the SAG value at the tip of the effective mirror on the image side of the fifth lens, SAG62 is the SAG value at the tip of the effective mirror on the image side of the sixth lens, and SAG72 is the SAG value at the tip of the effective mirror on the image side of the seventh lens .

When the SAG value has a negative value, it means that the tip of the effective mirror of the corresponding lens surface is located closer to the object side than the apex of the corresponding lens surface.

When the SAG value has a positive value, it means that the tip of the effective mirror of the corresponding lens surface is located closer to the upper side than the apex of the corresponding lens surface.

First to seventh lenses constituting an imaging optical system according to an embodiment of the present invention will be described.

The first lens has a positive refractive power. In addition, the first lens may have a meniscus shape convex toward the object side. In other words, the first surface of the first lens may be convex, and the second surface of the first lens may be concave.

At least one of the first surface and the second surface of the first lens may be an aspherical surface. For example, both surfaces of the first lens may be aspherical.

The second lens has negative refractive power. In addition, the second lens may have a meniscus shape convex toward the object side. In other words, the first surface of the second lens may be convex, and the second surface of the second lens may be concave.

At least one surface of the first surface and the second surface of the second lens may be an aspheric surface. For example, both surfaces of the second lens may be aspherical.

The third lens has positive refractive power. In addition, the third lens may have a meniscus shape convex toward the object side. In other words, the first surface of the third lens may be convex, and the second surface of the third lens may be concave.

At least one surface of the first surface and the second surface of the third lens may be aspheric. For example, both surfaces of the third lens may be aspherical.

The fourth lens has negative refractive power. In addition, the fourth lens may have a meniscus shape convex toward the object side. In other words, the first surface of the fourth lens may be convex, and the second surface of the fourth lens may be concave.

Alternatively, the fourth lens may have a concave shape on both sides. In other words, the first and second surfaces of the fourth lens may have concave shapes.

Alternatively, the fourth lens may have a meniscus shape convex upward. In other words, the first surface of the fourth lens may be concave, and the second surface of the fourth lens may be convex.

At least one surface of the first surface and the second surface of the fourth lens may be an aspheric surface. For example, both surfaces of the fourth lens may be aspherical.

The fifth lens has negative refractive power. In addition, the fifth lens may have a meniscus shape convex toward the object side. In other words, the first surface of the fifth lens may be convex in the paraxial region, and the second surface of the fifth lens may be concave in the paraxial region.

At least one surface of the first surface and the second surface of the fifth lens may be aspheric. For example, both surfaces of the fifth lens may be aspheric.

At least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens. For example, the first surface of the fifth lens may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens has positive refractive power. In addition, the sixth lens may have a convex shape on both sides. In other words, the first and second surfaces of the sixth lens may be convex in the paraxial region.

At least one surface of the first surface and the second surface of the sixth lens may be an aspheric surface. For example, both surfaces of the sixth lens may be aspherical.

At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens. For example, the first surface of the sixth lens may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens may be convex in the paraxial region and concave in a portion other than the paraxial region.

The seventh lens has negative refractive power. In addition, the seventh lens may have a concave shape on both sides. In other words, the first and second surfaces of the seventh lens may be concave in the paraxial region.

Alternatively, the seventh lens may have a meniscus shape convex toward the object side. In other words, the first surface of the seventh lens may be convex in the paraxial region, and the second surface of the seventh lens may be concave in the paraxial region.

At least one surface of the first surface and the second surface of the seventh lens may be an aspheric surface. For example, both surfaces of the seventh lens may be aspherical.

In addition, at least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens. For example, the first surface of the seventh lens may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens may be concave in the paraxial region and convex in parts other than the paraxial region.

Each of the first to seventh lenses may be formed of a plastic material having optical characteristics different from those of lenses disposed adjacent to each other.

Meanwhile, at least three of the first to seventh lenses may have a refractive index greater than 1.61. For example, the second lens, the fourth lens, and the fifth lens may have a refractive index greater than 1.61. Among the first to seventh lenses, a lens having a refractive index greater than 1.61 may have negative refractive power. For example, the second lens, the fourth lens, and the fifth lens each have a refractive index greater than 1.61 and a negative refractive power.

Among the first to fourth lenses, a lens having negative refractive power may have a refractive index greater than 1.67. For example, the second lens and the fourth lens may have negative refractive power and a refractive index greater than 1.67.

An imaging optical system 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

The imaging optical system 100 according to the first embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, It includes an optical system including the sixth lens 160 and the seventh lens 170, and may further include a filter 180 and an image sensor IS.

The imaging optical system 100 according to the first embodiment of the present invention may form a focus on the imaging surface 190 . The imaging surface 190 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 190 may refer to one surface of the image sensor IS through which light is received.

Table 1 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between the lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.623 0.908 1.544 56.1 6.463924 S2 8.946 0.025 S3 2nd lens 4.626 0.200 1.680 18.4 -15.3395 S4 3.161 0.303 S5 3rd lens 6.286 0.472 1.535 56.1 23.07 S6 12.424 0.553 S7 4th lens 83.603 0.313 1.680 18.4 -97.78 S8 37.255 0.658 S9 5th lens 84.761 0.328 1.614 25.9 -27.446 S10 14.151 0.359 S11 6th lens 5.897 0.413 1.567 38.0 9.766 S12 -99.105 1.483 S13 7th lens -17.170 0.595 1.535 56.1 -5.573 S14 3.670 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.763 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 100 according to the first embodiment of the present invention is 7.48 mm, the IMG HT is 7.145 mm, and the FOV is 85°.

In the first embodiment of the present invention, the first lens 110 has positive refractive power, the first surface of the first lens 110 has a convex shape, and the second surface of the first lens 110 has a concave shape. .

The second lens 120 has negative refractive power, the first surface of the second lens 120 is convex, and the second surface of the second lens 120 is concave.

The third lens 130 has positive refractive power, the first surface of the third lens 130 is convex, and the second surface of the third lens 130 is concave.

The fourth lens 140 has negative refractive power, a first surface of the fourth lens 140 is convex, and a second surface of the fourth lens 140 is concave.

The fifth lens 150 has negative refractive power, a first surface of the fifth lens 150 is convex in the paraxial region, and a second surface of the fifth lens 150 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the fifth lens 150 . For example, the first surface of the fifth lens 150 may be convex in the paraxial region and concave in parts other than the paraxial region. Also, the second surface of the fifth lens 150 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 160 has a positive refractive power, and the first and second surfaces of the sixth lens 160 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the sixth lens 160 . For example, the first surface of the sixth lens 160 may be convex in the paraxial region and concave in parts other than the paraxial region. Also, the second surface of the sixth lens 160 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 170 has negative refractive power, and the first and second surfaces of the seventh lens 170 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 170 . For example, the first surface of the seventh lens 170 may be concave in the paraxial region and convex in parts other than the paraxial region. Also, the second surface of the seventh lens 170 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 110 to the seventh lens 170 has an aspherical surface coefficient as shown in Table 2. For example, both the object-side surface and the image-side surface of the first lens 110 to the seventh lens 170 are aspheric.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -0.857 20.487 -19.636 -5.362 6.570 9.834 -99.000 4th order coefficient (A) 1.239E-01 -2.177E-02 3.552E-02 2.794E-02 7.274E-02 6.702E-02 -2.401E-01 6th order coefficient (B) 3.424E-03 -9.392E-03 1.248E-02 1.653E-02 2.623E-02 2.174E-02 -7.778E-03 8th order coefficient (C) -1.153E-03 -9.081E-03 -5.317E-03 -4.821E-03 1.528E-03 3.626E-03 -6.102E-03 Tenth order coefficient (D) -1.932E-03 -1.532E-03 2.146E-03 3.261E-04 6.273E-05 5.671E-04 -7.217E-03 12th order coefficient (E) -9.627E-04 -2.184E-03 -8.306E-04 -7.394E-05 -5.346E-05 7.421E-05 -6.548E-03 14th order coefficient (F) -5.990E-04 -2.857E-05 4.144E-04 1.644E-04 8.222E-05 1.149E-05 -5.549E-03 16th order coefficient (G) -1.648E-04 -2.300E-04 -6.002E-05 5.328E-05 -4.990E-06 -4.532E-07 -4.237E-03 18th order coefficient (H) -8.450E-05 -4.251E-05 6.566E-06 -2.640E-05 1.406E-05 1.647E-06 -3.170E-03 20th order coefficient (J) 5.673E-06 -2.188E-05 6.223E-06 1.086E-05 -1.574E-05 -3.023E-06 -2.128E-03 22nd Coefficient (L) -1.442E-05 -3.888E-05 -1.815E-05 -1.474E-05 9.109E-06 3.430E-06 -1.410E-03 24th order coefficient (M) 8.547E-06 1.874E-05 2.241E-05 1.104E-05 -3.685E-06 -2.464E-06 -8.146E-04 26th Coefficient (N) -1.365E-05 -3.107E-05 -1.311E-05 -6.636E-06 3.248E-06 1.748E-06 -4.536E-04 28th order coefficient (O) 8.107E-06 1.071E-05 5.232E-06 4.626E-06 -1.656E-06 -1.327E-06 -1.993E-04 30th order coefficient (P) -3.882E-06 -1.030E-05 -1.475E-06 -1.358E-06 2.768E-07 2.234E-07 -7.604E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) -97.615 -99.000 15.443 2.294 -46.284 -29.100 -19.085 4th order coefficient (A) -3.470E-01 -9.689E-01 -1.580E+00 -2.338E+00 -1.120E+00 -1.494E+00 -3.523E+00 6th order coefficient (B) 2.447E-02 -3.777E-02 2.911E-01 2.590E-01 3.903E-02 1.153E+00 1.081E+00 8th order coefficient (C) 1.419E-02 6.072E-02 4.886E-02 1.006E-01 7.237E-03 -6.181E-01 -2.053E-01 Tenth order coefficient (D) 2.892E-03 5.302E-02 -1.140E-02 -1.215E-03 -4.935E-03 2.946E-01 8.379E-02 12th order coefficient (E) -2.499E-03 5.018E-03 -2.257E-02 -2.233E-02 2.161E-02 -1.222E-01 -6.248E-02 14th order coefficient (F) -2.976E-03 -1.268E-02 1.211E-02 -1.317E-02 -3.634E-04 3.333E-02 2.303E-02 16th order coefficient (G) -2.088E-03 -1.149E-02 6.725E-03 6.247E-03 3.861E-03 -5.861E-03 -1.381E-02 18th order coefficient (H) -9.637E-04 -2.869E-03 -7.019E-03 6.015E-03 2.795E-03 1.669E-03 6.738E-03 20th order coefficient (J) -3.202E-04 3.988E-03 -8.265E-03 -1.939E-03 -1.592E-03 -3.472E-03 -5.404E-03 22nd Coefficient (L) -7.021E-05 7.057E-03 -2.323E-03 -1.420E-03 -1.835E-05 5.264E-03 4.275E-03 24th order coefficient (M) -2.018E-05 6.462E-03 -7.608E-04 7.438E-05 -1.385E-04 -4.506E-03 -2.022E-03 26th Coefficient (N) -3.969E-05 4.093E-03 -1.649E-03 3.138E-04 -2.270E-04 3.030E-03 8.683E-04 28th order coefficient (O) -3.269E-05 1.731E-03 -1.599E-03 5.532E-05 -9.678E-05 -1.391E-03 -4.841E-04 30th order coefficient (P) -2.100E-05 3.844E-04 -5.523E-04 -5.381E-05 -5.632E-06 3.711E-04 3.339E-04

In addition, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 2 .

An imaging optical system 200 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4 .

An imaging optical system 200 according to a second embodiment of the present invention includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, It includes an optical system including the sixth lens 260 and the seventh lens 270, and may further include a filter 280 and an image sensor IS.

The imaging optical system 200 according to the second embodiment of the present invention may form a focus on the imaging surface 290 . The imaging surface 290 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 290 may refer to one surface of the image sensor IS through which light is received.

Table 3 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.625 0.894 1.544 56.1 6.463924 S2 8.953 0.025 S3 2nd lens 4.758 0.200 1.680 18.4 -15.3395 S4 3.196 0.277 S5 3rd lens 6.106 0.487 1.535 56.1 23.07 S6 11.674 0.552 S7 4th lens 62.938 0.290 1.680 18.4 -97.78 S8 35.665 0.657 S9 5th lens 82.391 0.332 1.614 25.9 -27.446 S10 14.074 0.380 S11 6th lens 5.907 0.423 1.567 38.0 9.766 S12 -112.805 1.556 S13 7th lens -19.437 0.548 1.535 56.1 -5.573 S14 3.607 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.752 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 200 according to the second embodiment of the present invention is 7.48 mm, the IMG HT is 7.145 mm, and the FOV is 85°.

In the second embodiment of the present invention, the first lens 210 has a positive refractive power, the first surface of the first lens 210 is convex, and the second surface of the first lens 210 is concave. .

The second lens 220 has negative refractive power, the first surface of the second lens 220 is convex, and the second surface of the second lens 220 is concave.

The third lens 230 has positive refractive power, a first surface of the third lens 230 is convex, and a second surface of the third lens 230 is concave.

The fourth lens 240 has negative refractive power, a first surface of the fourth lens 240 is convex, and a second surface of the fourth lens 240 is concave.

The fifth lens 250 has negative refractive power, a first surface of the fifth lens 250 is convex in the paraxial region, and a second surface of the fifth lens 250 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 250 . For example, the first surface of the fifth lens 250 may be convex in the paraxial region and concave in parts other than the paraxial region. Also, the second surface of the fifth lens 250 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 260 has a positive refractive power, and the first and second surfaces of the sixth lens 260 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the sixth lens 260 . For example, the first surface of the sixth lens 260 may be convex in the paraxial region and concave in parts other than the paraxial region. Also, the second surface of the sixth lens 260 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 270 has negative refractive power, and the first and second surfaces of the seventh lens 270 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 270 . For example, the first surface of the seventh lens 270 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 270 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 210 to the seventh lens 270 has an aspherical surface coefficient as shown in Table 4. For example, both the object-side surface and the image-side surface of the first lens 210 to the seventh lens 270 are aspheric.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -0.911 20.601 -19.837 -5.544 5.339 11.641 -99.000 4th order coefficient (A) 1.224E-01 -2.144E-02 3.547E-02 2.668E-02 7.235E-02 6.725E-02 -2.370E-01 6th order coefficient (B) 2.364E-03 -9.882E-03 1.069E-02 1.514E-02 2.613E-02 2.163E-02 -9.143E-03 8th order coefficient (C) -1.868E-03 -8.788E-03 -4.808E-03 -4.553E-03 1.702E-03 3.554E-03 -7.457E-03 Tenth order coefficient (D) -2.121E-03 -1.281E-03 2.226E-03 2.239E-04 -2.317E-05 5.379E-04 -7.863E-03 12th order coefficient (E) -1.135E-03 -2.323E-03 -8.876E-04 -7.717E-05 -6.513E-05 2.642E-05 -7.090E-03 14th order coefficient (F) -6.604E-04 -1.126E-04 3.800E-04 1.805E-04 7.216E-05 1.079E-05 -5.739E-03 16th order coefficient (G) -2.424E-04 -2.995E-04 -8.488E-05 5.338E-05 -3.598E-06 -1.878E-05 -4.298E-03 18th order coefficient (H) -9.996E-05 -2.051E-05 1.412E-05 -2.814E-05 8.770E-06 -9.770E-07 -3.135E-03 20th order coefficient (J) -1.352E-05 -2.484E-05 9.327E-06 1.417E-05 -1.230E-05 -4.896E-06 -2.085E-03 22nd Coefficient (L) -1.099E-05 -2.617E-05 -1.693E-05 -1.466E-05 9.624E-06 5.473E-06 -1.351E-03 24th order coefficient (M) -4.745E-07 1.199E-05 2.504E-05 1.375E-05 -3.802E-06 -7.104E-06 -7.694E-04 26th Coefficient (N) -6.869E-06 -3.012E-05 -1.257E-05 -7.759E-06 2.982E-06 4.593E-06 -4.182E-04 28th order coefficient (O) 4.833E-06 1.689E-06 4.272E-06 4.320E-06 -1.683E-06 3.811E-07 -1.813E-04 30th order coefficient (P) -6.909E-06 -1.053E-05 -1.769E-06 -1.336E-06 3.125E-07 -9.471E-07 -6.532E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) -12.135 62.143 16.029 2.364 -99.000 -13.325 -18.392 4th order coefficient (A) -3.458E-01 -9.528E-01 -1.571E+00 -2.338E+00 -1.124E+00 -1.507E+00 -3.482E+00 6th order coefficient (B) 2.334E-02 -3.129E-02 2.851E-01 2.571E-01 2.947E-02 1.163E+00 1.057E+00 8th order coefficient (C) 1.257E-02 6.022E-02 4.323E-02 1.015E-01 1.039E-02 -6.297E-01 -2.207E-01 Tenth order coefficient (D) 1.729E-03 5.321E-02 -1.017E-02 -2.537E-03 -5.874E-03 2.856E-01 8.434E-02 12th order coefficient (E) -3.080E-03 3.896E-03 -2.204E-02 -2.190E-02 2.284E-02 -1.199E-01 -6.928E-02 14th order coefficient (F) -2.770E-03 -1.273E-02 1.375E-02 -1.136E-02 2.010E-03 3.555E-02 2.362E-02 16th order coefficient (G) -1.616E-03 -1.074E-02 6.368E-03 5.863E-03 4.029E-03 -6.608E-03 -1.372E-02 18th order coefficient (H) -4.798E-04 -2.179E-03 -8.330E-03 5.586E-03 3.807E-03 3.932E-03 9.957E-03 20th order coefficient (J) 6.884E-05 3.760E-03 -8.883E-03 -2.106E-03 -7.595E-04 -5.372E-03 -5.384E-03 22nd Coefficient (L) 2.092E-04 5.804E-03 -1.327E-03 -1.632E-03 -2.657E-04 6.433E-03 3.732E-03 24th order coefficient (M) 1.535E-04 4.914E-03 8.744E-04 2.637E-04 -2.318E-04 -5.016E-03 -2.083E-03 26th Coefficient (N) 6.942E-05 2.891E-03 -6.180E-04 4.570E-04 -3.318E-04 2.763E-03 9.186E-04 28th order coefficient (O) 1.920E-05 1.108E-03 -1.278E-03 9.244E-06 -2.453E-04 -9.938E-04 -3.946E-04 30th order coefficient (P) 2.998E-06 1.931E-04 -5.013E-04 -9.121E-05 -6.323E-05 1.930E-04 1.223E-04

Also, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 4 .

An imaging optical system 300 according to a third embodiment of the present invention will be described with reference to FIGS. 5 and 6 .

An imaging optical system 300 according to a third embodiment of the present invention includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, It includes an optical system including the sixth lens 360 and the seventh lens 370, and may further include a filter 380 and an image sensor IS.

The imaging optical system 300 according to the third embodiment of the present invention may form a focus on the imaging surface 390 . The imaging surface 390 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 390 may refer to one surface of the image sensor IS through which light is received.

The lens characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, index of refraction, Abbe number, focal length) are shown in Table 5.

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.643 0.861 1.544 56.1 6.463924 S2 9.093 0.060 S3 2nd lens 5.027 0.258 1.680 18.4 -15.3395 S4 3.301 0.205 S5 3rd lens 6.513 0.509 1.535 56.1 23.07 S6 15.119 0.529 S7 4th lens -42.233 0.349 1.680 18.4 -97.78 S8 541.701 0.603 S9 5th lens 16.957 0.340 1.614 25.9 -27.446 S10 8.782 0.427 S11 6th lens 5.954 0.450 1.567 38.0 9.766 S12 -31.294 1.411 S13 7th lens -24.662 0.579 1.535 56.1 -5.573 S14 3.420 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.796 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 300 according to the third embodiment of the present invention is 7.48 mm, IMG HT is 7.145 mm, and FOV is 86°.

In the third embodiment of the present invention, the first lens 310 has a positive refractive power, the first surface of the first lens 310 is convex, and the second surface of the first lens 310 is concave. .

The second lens 320 has negative refractive power, the first surface of the second lens 320 is convex, and the second surface of the second lens 320 is concave.

The third lens 330 has a positive refractive power, a first surface of the third lens 330 is convex, and a second surface of the third lens 330 is concave.

The fourth lens 340 has negative refractive power, and the first and second surfaces of the fourth lens 340 are concave.

The fifth lens 350 has negative refractive power, a first surface of the fifth lens 350 is convex in the paraxial region, and a second surface of the fifth lens 350 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 350 . For example, the first surface of the fifth lens 350 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 350 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 360 has positive refractive power, and the first and second surfaces of the sixth lens 360 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the sixth lens 360 . For example, the first surface of the sixth lens 360 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 360 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 370 has negative refractive power, and the first and second surfaces of the seventh lens 370 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 370 . For example, the first surface of the seventh lens 370 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 370 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 310 to the seventh lens 370 has an aspherical surface coefficient as shown in Table 6. For example, both the object-side surface and the image-side surface of the first lens 310 to the seventh lens 370 are aspheric surfaces.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -0.994 21.296 -22.996 -5.805 5.257 35.044 95.823 4th order coefficient (A) 1.159E-01 -2.068E-02 4.123E-02 2.402E-02 7.600E-02 7.778E-02 -2.016E-01 6th order coefficient (B) -2.500E-03 -1.367E-02 4.226E-03 9.564E-03 2.203E-02 2.005E-02 -1.179E-02 8th order coefficient (C) -4.969E-03 -9.425E-03 -9.176E-04 -2.122E-03 1.087E-03 2.876E-03 -9.649E-03 Tenth order coefficient (D) -3.545E-03 -2.904E-03 1.011E-03 3.115E-04 -6.630E-05 1.521E-04 -9.313E-03 12th order coefficient (E) -1.601E-03 -1.631E-03 -3.519E-04 2.327E-04 -1.657E-04 -1.202E-04 -8.078E-03 14th order coefficient (F) -6.721E-04 -2.607E-06 3.728E-04 3.228E-04 9.997E-05 -6.997E-05 -6.522E-03 16th order coefficient (G) -1.250E-04 -9.137E-05 -2.014E-05 2.446E-05 -1.280E-05 -3.847E-05 -4.868E-03 18th order coefficient (H) -2.642E-05 -2.445E-05 1.380E-05 -3.987E-05 1.422E-05 -2.045E-05 -3.588E-03 20th order coefficient (J) 2.629E-05 -4.622E-05 -1.328E-05 3.829E-06 -2.257E-05 -6.683E-06 -2.419E-03 22nd Coefficient (L) -1.116E-05 -2.296E-05 3.208E-06 -2.435E-06 1.747E-05 2.283E-06 -1.605E-03 24th order coefficient (M) 4.435E-06 -1.249E-05 -1.919E-06 1.132E-06 -4.305E-06 -5.959E-06 -9.370E-04 26th Coefficient (N) -1.095E-05 -1.171E-05 -2.538E-06 -4.439E-06 1.840E-06 4.331E-07 -5.251E-04 28th order coefficient (O) 3.438E-06 7.299E-06 2.207E-06 1.683E-06 -1.723E-06 -2.454E-06 -2.333E-04 30th order coefficient (P) -1.163E-05 -9.039E-06 -1.438E-06 -2.792E-07 4.077E-07 4.547E-07 -8.908E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) 63.979 -3.234 4.179 2.305 42.064 2.771 -11.092 4th order coefficient (A) -3.172E-01 -9.796E-01 -1.629E+00 -2.336E+00 -8.742E-01 -1.674E+00 -3.889E+00 6th order coefficient (B) 3.010E-02 1.851E-02 2.694E-01 1.967E-01 5.217E-03 1.190E+00 1.024E+00 8th order coefficient (C) 1.015E-02 5.175E-02 3.910E-02 9.629E-02 5.652E-02 -6.181E-01 -2.073E-01 Tenth order coefficient (D) -1.679E-04 4.086E-02 8.451E-03 -1.402E-02 -8.435E-03 2.779E-01 1.129E-01 12th order coefficient (E) -3.776E-03 2.650E-05 -1.668E-02 -2.051E-02 1.660E-02 -1.137E-01 -7.562E-02 14th order coefficient (F) -1.980E-03 -7.366E-03 4.564E-03 -7.168E-03 -2.451E-03 3.738E-02 1.769E-02 16th order coefficient (G) -5.668E-04 -4.669E-03 6.296E-04 5.130E-03 1.251E-03 -1.834E-03 -1.575E-02 18th order coefficient (H) 2.498E-04 -8.325E-04 -6.500E-03 2.281E-03 4.205E-04 3.162E-03 1.159E-02 20th order coefficient (J) 2.898E-04 5.611E-04 -5.754E-03 -1.588E-03 -1.550E-03 -1.208E-03 -5.706E-03 22nd Coefficient (L) 1.399E-04 5.774E-04 -6.253E-04 -5.771E-04 -8.926E-05 6.540E-03 2.898E-03 24th order coefficient (M) -1.441E-05 2.717E-04 1.535E-03 1.092E-04 -2.255E-04 -4.173E-03 -2.715E-03 26th Coefficient (N) -5.552E-05 1.081E-04 9.870E-04 1.873E-04 5.470E-05 2.404E-03 1.007E-03 28th order coefficient (O) -4.020E-05 -1.637E-05 4.051E-05 -5.598E-07 4.603E-05 -1.187E-03 -1.058E-04 30th order coefficient (P) -9.723E-06 -3.695E-05 -6.652E-05 -4.071E-05 9.201E-06 -3.349E-05 6.582E-04

Also, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 6 .

An imaging optical system 400 according to a fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8 .

An imaging optical system 400 according to a fourth embodiment of the present invention includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, It includes an optical system including a sixth lens 460 and a seventh lens 470, and may further include a filter 480 and an image sensor IS.

The imaging optical system 400 according to the fourth embodiment of the present invention may form a focus on the imaging surface 490 . The imaging surface 490 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 490 may refer to one surface of the image sensor IS through which light is received.

Table 7 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between the lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.642 0.874 1.544 56.1 6.463924 S2 9.089 0.050 S3 2nd lens 4.949 0.240 1.680 18.4 -15.3395 S4 3.284 0.224 S5 3rd lens 6.409 0.518 1.535 56.1 23.07 S6 14.083 0.537 S7 4th lens -39.761 0.309 1.680 18.4 -97.78 S8 -212.639 0.643 S9 5th lens 20.106 0.340 1.614 25.9 -27.446 S10 9.202 0.404 S11 6th lens 5.972 0.413 1.567 38.0 9.766 S12 -44.144 1.504 S13 7th lens -22.213 0.562 1.535 56.1 -5.573 S14 3.399 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.738 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 400 according to the fourth embodiment of the present invention is 7.48 mm, the IMG HT is 7.145 mm, and the FOV is 85.5°.

In the fourth embodiment of the present invention, the first lens 410 has positive refractive power, the first surface of the first lens 410 is convex, and the second surface of the first lens 410 is concave. .

The second lens 420 has negative refractive power, the first surface of the second lens 420 is convex, and the second surface of the second lens 420 is concave.

The third lens 430 has positive refractive power, a first surface of the third lens 430 is convex, and a second surface of the third lens 430 is concave.

The fourth lens 440 has negative refractive power, a first surface of the fourth lens 440 is concave, and a second surface of the fourth lens 440 is convex.

The fifth lens 450 has negative refractive power, a first surface of the fifth lens 450 is convex in the paraxial region, and a second surface of the fifth lens 450 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 450 . For example, the first surface of the fifth lens 450 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 450 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 460 has a positive refractive power, and the first and second surfaces of the sixth lens 460 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the sixth lens 460 . For example, the first surface of the sixth lens 460 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 460 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 470 has negative refractive power, and the first and second surfaces of the seventh lens 470 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 470 . For example, the first surface of the seventh lens 470 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 470 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 410 to the seventh lens 470 has an aspherical surface coefficient as shown in Table 8. For example, both the object-side surface and the image-side surface of the first lens 410 to the seventh lens 470 are aspheric surfaces.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -0.962 21.265 -23.637 -5.768 5.256 34.485 99.000 4th order coefficient (A) 1.189E-01 -2.131E-02 4.042E-02 2.467E-02 7.593E-02 7.790E-02 -2.032E-01 6th order coefficient (B) -1.715E-03 -1.355E-02 4.662E-03 1.039E-02 2.104E-02 1.832E-02 -1.273E-02 8th order coefficient (C) -3.566E-03 -8.962E-03 -1.480E-03 -2.394E-03 9.759E-04 2.759E-03 -8.837E-03 Tenth order coefficient (D) -3.020E-03 -2.618E-03 8.852E-04 6.600E-05 1.767E-06 1.332E-04 -8.868E-03 12th order coefficient (E) -1.231E-03 -1.605E-03 -3.764E-04 1.913E-04 -1.542E-04 -6.314E-05 -7.636E-03 14th order coefficient (F) -6.617E-04 4.362E-06 3.834E-04 2.479E-04 1.015E-04 -7.269E-05 -6.405E-03 16th order coefficient (G) -7.249E-05 -6.513E-05 -5.578E-06 3.500E-05 -2.024E-05 -2.429E-05 -4.807E-03 18th order coefficient (H) -5.633E-05 -4.611E-05 7.220E-06 -4.029E-05 1.487E-05 -2.605E-05 -3.648E-03 20th order coefficient (J) 5.163E-05 -3.245E-05 -1.432E-05 4.817E-06 -2.220E-05 -4.516E-06 -2.486E-03 22nd Coefficient (L) -2.385E-05 -2.938E-05 3.690E-06 -3.075E-06 1.772E-05 -5.386E-07 -1.711E-03 24th order coefficient (M) 1.544E-05 -3.689E-06 -2.355E-06 2.589E-06 -4.217E-06 -1.857E-06 -1.018E-03 26th Coefficient (N) -2.058E-05 -1.246E-05 -2.120E-06 -5.189E-06 1.841E-06 -2.089E-06 -5.987E-04 28th order coefficient (O) 1.132E-05 1.040E-05 2.284E-06 1.756E-06 -1.745E-06 -1.441E-06 -2.794E-04 30th order coefficient (P) -1.036E-05 -1.153E-05 -1.302E-06 -1.020E-07 4.008E-07 -7.907E-08 -1.196E-04 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) 99.000 -9.626 3.971 2.309 99.000 0.747 -12.041 4th order coefficient (A) -3.203E-01 -9.829E-01 -1.635E+00 -2.343E+00 -9.147E-01 -1.649E+00 -3.822E+00 6th order coefficient (B) 2.994E-02 1.620E-02 2.738E-01 2.046E-01 -7.286E-03 1.184E+00 1.019E+00 8th order coefficient (C) 1.104E-02 5.423E-02 4.038E-02 9.506E-02 5.627E-02 -6.201E-01 -2.150E-01 Tenth order coefficient (D) -8.390E-04 4.117E-02 5.882E-03 -1.346E-02 -6.920E-03 2.764E-01 1.034E-01 12th order coefficient (E) -4.176E-03 4.560E-04 -1.693E-02 -2.061E-02 1.636E-02 -1.081E-01 -7.551E-02 14th order coefficient (F) -2.168E-03 -7.416E-03 5.451E-03 -7.080E-03 -1.717E-03 3.845E-02 2.676E-02 16th order coefficient (G) -2.297E-04 -4.701E-03 9.516E-04 4.781E-03 1.014E-03 -5.494E-03 -1.769E-02 18th order coefficient (H) 5.827E-04 -7.707E-04 -6.858E-03 2.631E-03 4.903E-04 7.122E-03 1.295E-02 20th order coefficient (J) 5.169E-04 5.599E-04 -6.371E-03 -1.687E-03 -1.747E-03 -4.322E-03 -8.190E-03 22nd Coefficient (L) 1.433E-04 5.293E-04 -6.302E-04 -5.809E-04 -7.311E-05 7.360E-03 3.688E-03 24th order coefficient (M) -8.609E-05 1.993E-04 1.821E-03 6.918E-05 -2.277E-04 -5.427E-03 -2.723E-03 26th Coefficient (N) -1.604E-04 7.439E-05 1.254E-03 2.024E-04 4.714E-05 2.311E-03 9.106E-04 28th order coefficient (O) -9.767E-05 -2.613E-05 1.001E-04 -2.274E-05 3.713E-05 -1.808E-03 -3.738E-04 30th order coefficient (P) -3.819E-05 -3.885E-05 -6.278E-05 -3.698E-05 2.919E-05 2.691E-05 7.381E-04

In addition, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 8 .

An imaging optical system 500 according to a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10 .

An imaging optical system 500 according to a fifth embodiment of the present invention includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, It includes an optical system including a sixth lens 560 and a seventh lens 570, and may further include a filter 580 and an image sensor IS.

The imaging optical system 500 according to the fifth embodiment of the present invention may form a focus on the imaging surface 590 . The imaging surface 590 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 590 may refer to one surface of the image sensor IS through which light is received.

Table 9 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between the lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.638 0.868 1.544 56.1 6.463924 S2 9.064 0.025 S3 2nd lens 4.845 0.237 1.680 18.4 -15.3395 S4 3.342 0.250 S5 3rd lens 6.364 0.527 1.535 56.1 23.07 S6 12.270 0.529 S7 4th lens -73.360 0.307 1.680 18.4 -97.78 S8 107.250 0.634 S9 5th lens 21.865 0.340 1.614 25.9 -27.446 S10 9.712 0.467 S11 6th lens 6.002 0.450 1.567 38.0 9.766 S12 -45.629 1.382 S13 7th lens -22.784 0.544 1.535 56.1 -5.573 S14 3.482 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.795 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 500 according to the fifth embodiment of the present invention is 7.48 mm, IMG HT is 7.145 mm, and FOV is 85.3°.

In the fifth embodiment of the present invention, the first lens 510 has a positive refractive power, the first surface of the first lens 510 is convex, and the second surface of the first lens 510 is concave. .

The second lens 520 has negative refractive power, the first surface of the second lens 520 is convex, and the second surface of the second lens 520 is concave.

The third lens 530 has positive refractive power, a first surface of the third lens 530 is convex, and a second surface of the third lens 530 is concave.

The fourth lens 540 has negative refractive power, and the first and second surfaces of the fourth lens 540 are concave.

The fifth lens 550 has negative refractive power, a first surface of the fifth lens 550 is convex in the paraxial region, and a second surface of the fifth lens 550 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 550 . For example, the first surface of the fifth lens 550 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 550 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 560 has positive refractive power, and the first and second surfaces of the sixth lens 560 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the sixth lens 560 . For example, the first surface of the sixth lens 560 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 560 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 570 has negative refractive power, and the first and second surfaces of the seventh lens 570 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 570 . For example, the first surface of the seventh lens 570 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 570 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 510 to the seventh lens 570 has an aspherical surface coefficient as shown in Table 10. For example, both the object-side surface and the image-side surface of the first lens 510 to the seventh lens 570 are aspheric surfaces.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -0.924 21.123 -23.723 -5.723 4.878 25.981 99.000 4th order coefficient (A) 1.227E-01 -2.079E-02 3.983E-02 2.559E-02 7.404E-02 7.402E-02 -2.063E-01 6th order coefficient (B) -6.040E-03 -1.502E-02 7.903E-03 1.068E-02 2.184E-02 1.958E-02 -1.763E-02 8th order coefficient (C) -1.339E-03 -7.403E-03 -2.798E-03 -2.975E-03 8.331E-04 2.813E-03 -7.784E-03 Tenth order coefficient (D) -2.941E-03 -2.264E-03 1.761E-03 -2.201E-04 4.477E-05 1.650E-04 -9.129E-03 12th order coefficient (E) -3.148E-04 -1.542E-03 -8.937E-04 8.937E-05 -1.103E-04 -1.168E-04 -7.063E-03 14th order coefficient (F) -7.361E-04 -1.287E-04 4.833E-04 6.411E-05 9.306E-05 -1.062E-04 -6.430E-03 16th order coefficient (G) 1.363E-04 3.515E-05 -9.487E-05 8.939E-05 -2.948E-05 -4.618E-05 -4.632E-03 18th order coefficient (H) -1.904E-04 -1.282E-04 4.298E-05 -6.712E-05 1.065E-05 -3.157E-05 -3.751E-03 20th order coefficient (J) 1.394E-04 9.439E-05 7.610E-06 4.163E-05 -2.389E-05 -9.749E-06 -2.491E-03 22nd Coefficient (L) -9.103E-05 -1.208E-04 -5.235E-06 -2.106E-05 1.782E-05 -1.249E-05 -1.819E-03 24th order coefficient (M) 8.401E-05 5.762E-05 7.491E-06 1.976E-05 -3.663E-06 -2.540E-06 -1.053E-03 26th Coefficient (N) -5.597E-05 -5.774E-05 -4.723E-06 -1.554E-05 2.147E-06 -1.580E-05 -6.718E-04 28th order coefficient (O) 4.181E-05 5.189E-05 -1.913E-07 4.501E-06 -1.739E-06 9.670E-06 -2.934E-04 30th order coefficient (P) -1.928E-05 -2.884E-05 -4.715E-07 -4.168E-07 3.451E-07 -2.959E-06 -1.569E-04 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) -99.000 2.883 4.621 2.323 99.000 -2.750 -14.643 4th order coefficient (A) -3.377E-01 -9.787E-01 -1.627E+00 -2.346E+00 -9.826E-01 -1.657E+00 -3.675E+00 6th order coefficient (B) 2.315E-02 2.116E-02 2.723E-01 2.069E-01 3.276E-02 1.184E+00 1.018E+00 8th order coefficient (C) 1.215E-02 5.473E-02 3.403E-02 9.696E-02 4.848E-02 -6.293E-01 -2.272E-01 Tenth order coefficient (D) -6.473E-04 4.028E-02 6.959E-03 -7.692E-03 -7.880E-03 2.868E-01 9.687E-02 12th order coefficient (E) -3.795E-03 -4.400E-04 -1.564E-02 -2.154E-02 1.584E-02 -1.112E-01 -6.542E-02 14th order coefficient (F) -2.420E-03 -8.231E-03 6.009E-03 -9.576E-03 -1.855E-03 3.054E-02 2.328E-02 16th order coefficient (G) -2.887E-04 -4.904E-03 2.553E-04 4.937E-03 9.783E-04 -2.020E-03 -1.610E-02 18th order coefficient (H) 5.142E-04 -9.033E-04 -6.850E-03 2.710E-03 2.613E-04 3.862E-03 9.275E-03 20th order coefficient (J) 6.807E-04 7.985E-04 -5.466E-03 -1.192E-03 -1.128E-03 -4.410E-03 -5.493E-03 22nd Coefficient (L) 2.643E-04 7.260E-04 -4.289E-04 -6.845E-04 -8.831E-05 7.297E-03 3.043E-03 24th order coefficient (M) 4.010E-05 3.723E-04 1.198E-03 -4.552E-05 -1.924E-04 -4.470E-03 -1.933E-03 26th Coefficient (N) -1.176E-04 1.976E-05 4.998E-04 1.432E-04 1.556E-05 2.037E-03 1.034E-03 28th order coefficient (O) -7.331E-05 -6.880E-05 -2.020E-04 7.928E-06 4.726E-05 -8.894E-04 1.065E-04 30th order coefficient (P) -4.070E-05 -8.085E-05 -1.334E-04 -3.814E-05 8.166E-06 -9.818E-05 5.701E-04

Also, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 10 .

An imaging optical system 600 according to a sixth embodiment of the present invention will be described with reference to FIGS. 11 and 12 .

An imaging optical system 600 according to a sixth embodiment of the present invention includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, It includes an optical system including a sixth lens 660 and a seventh lens 670, and may further include a filter 680 and an image sensor IS.

The imaging optical system 600 according to the sixth embodiment of the present invention may form a focus on the imaging surface 690 . The imaging surface 690 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 690 may refer to one surface of the image sensor IS through which light is received.

Table 11 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.636 0.891 1.544 56.1 6.463924 S2 9.051 0.025 S3 2nd lens 4.780 0.216 1.680 18.4 -15.3395 S4 3.331 0.254 S5 3rd lens 6.437 0.530 1.535 56.1 23.07 S6 12.010 0.529 S7 4th lens -144.579 0.303 1.680 18.4 -97.78 S8 58.788 0.639 S9 5th lens 23.967 0.340 1.614 25.9 -27.446 S10 10.355 0.467 S11 6th lens 6.016 0.450 1.567 38.0 9.766 S12 -51.732 1.427 S13 7th lens -17.848 0.543 1.535 56.1 -5.573 S14 3.584 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.761 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 600 according to the sixth embodiment of the present invention is 7.48 mm, IMG HT is 7.145 mm, and FOV is 85°.

In the sixth embodiment of the present invention, the first lens 610 has a positive refractive power, the first surface of the first lens 610 is convex, and the second surface of the first lens 610 is concave. .

The second lens 620 has negative refractive power, the first surface of the second lens 620 is convex, and the second surface of the second lens 620 is concave.

The third lens 630 has a positive refractive power, a first surface of the third lens 630 is convex, and a second surface of the third lens 630 is concave.

The fourth lens 640 has negative refractive power, and the first and second surfaces of the fourth lens 640 are concave.

The fifth lens 650 has negative refractive power, a first surface of the fifth lens 650 is convex in the paraxial region, and a second surface of the fifth lens 650 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 650 . For example, the first surface of the fifth lens 650 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 650 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 660 has positive refractive power, and the first and second surfaces of the sixth lens 660 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the sixth lens 660 . For example, the first surface of the sixth lens 660 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 660 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 670 has negative refractive power, and the first and second surfaces of the seventh lens 670 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 670 . For example, the first surface of the seventh lens 670 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 670 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 610 to the seventh lens 670 has an aspherical surface coefficient as shown in Table 12. For example, both the object-side surface and the image-side surface of the first lens 610 to the seventh lens 670 are aspheric.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -0.907 21.100 -24.104 -5.754 4.991 23.293 99.000 4th order coefficient (A) 1.239E-01 -2.024E-02 3.999E-02 2.564E-02 7.375E-02 7.276E-02 -2.095E-01 6th order coefficient (B) -5.724E-03 -1.509E-02 1.018E-02 1.291E-02 2.157E-02 1.934E-02 -1.821E-02 8th order coefficient (C) -1.105E-03 -7.667E-03 -3.062E-03 -2.786E-03 8.655E-04 2.617E-03 -7.263E-03 Tenth order coefficient (D) -2.885E-03 -2.186E-03 1.966E-03 -1.626E-04 3.640E-05 2.080E-04 -8.667E-03 12th order coefficient (E) -2.165E-04 -1.561E-03 -9.686E-04 6.383E-05 -1.097E-04 -1.358E-04 -6.534E-03 14th order coefficient (F) -7.209E-04 -8.695E-05 5.235E-04 4.794E-05 9.025E-05 -8.083E-05 -6.078E-03 16th order coefficient (G) 1.540E-04 5.339E-05 -1.064E-04 9.796E-05 -2.815E-05 -5.649E-05 -4.300E-03 18th order coefficient (H) -1.943E-04 -1.164E-04 4.794E-05 -7.420E-05 1.379E-05 -2.643E-05 -3.530E-03 20th order coefficient (J) 1.424E-04 1.140E-04 1.025E-05 4.712E-05 -2.505E-05 -1.394E-05 -2.313E-03 22nd Coefficient (L) -9.737E-05 -1.173E-04 -1.869E-06 -2.150E-05 1.766E-05 -4.901E-06 -1.715E-03 24th order coefficient (M) 7.769E-05 6.427E-05 7.803E-06 2.125E-05 -3.638E-06 -4.764E-06 -9.830E-04 26th Coefficient (N) -6.208E-05 -6.727E-05 -4.052E-06 -1.578E-05 2.142E-06 -1.759E-05 -6.397E-04 28th order coefficient (O) 4.406E-05 5.683E-05 -1.763E-07 4.379E-06 -1.761E-06 1.195E-05 -2.809E-04 30th order coefficient (P) -1.269E-05 -3.083E-05 -6.983E-07 -4.456E-07 3.555E-07 -3.563E-06 -1.528E-04 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) -98.918 20.903 7.146 2.349 99.000 -11.865 -18.024 4th order coefficient (A) -3.468E-01 -9.754E-01 -1.612E+00 -2.347E+00 -1.017E+00 -1.629E+00 -3.604E+00 6th order coefficient (B) 2.067E-02 2.139E-02 2.776E-01 2.177E-01 3.978E-02 1.183E+00 1.020E+00 8th order coefficient (C) 1.237E-02 5.518E-02 3.405E-02 9.760E-02 4.477E-02 -6.371E-01 -2.259E-01 Tenth order coefficient (D) 2.368E-04 4.002E-02 3.370E-03 -4.607E-03 -6.692E-03 2.875E-01 8.528E-02 12th order coefficient (E) -3.679E-03 -9.956E-04 -1.617E-02 -2.279E-02 1.488E-02 -1.087E-01 -6.249E-02 14th order coefficient (F) -2.718E-03 -8.293E-03 7.235E-03 -1.035E-02 -1.088E-03 2.838E-02 2.509E-02 16th order coefficient (G) -7.613E-04 -4.690E-03 1.216E-03 4.595E-03 7.098E-04 -2.743E-03 -1.632E-02 18th order coefficient (H) 1.229E-04 -6.465E-04 -6.695E-03 3.349E-03 4.311E-04 4.894E-03 9.822E-03 20th order coefficient (J) 4.078E-04 8.016E-04 -5.553E-03 -9.193E-04 -1.060E-03 -5.888E-03 -6.684E-03 22nd Coefficient (L) 1.188E-04 6.722E-04 -8.176E-04 -7.351E-04 -8.463E-05 8.142E-03 3.774E-03 24th order coefficient (M) -4.075E-05 2.798E-04 5.063E-04 -2.006E-04 -1.725E-04 -5.122E-03 -1.888E-03 26th Coefficient (N) -1.556E-04 1.370E-05 -2.004E-04 1.349E-04 -4.106E-06 2.548E-03 1.162E-03 28th order coefficient (O) -9.469E-05 -7.070E-05 -6.009E-04 4.864E-05 4.876E-05 -1.083E-03 1.112E-05 30th order coefficient (P) -4.633E-05 -5.835E-05 -2.539E-04 -1.591E-05 8.869E-06 1.843E-05

Also, the imaging optical system configured as above may have aberration characteristics shown in FIG. 12 .

An imaging optical system 700 according to a seventh embodiment of the present invention will be described with reference to FIGS. 13 and 14 .

An imaging optical system 700 according to a seventh embodiment of the present invention includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, An optical system including a sixth lens 760 and a seventh lens 770 may be included, and may further include a filter 780 and an image sensor IS.

The imaging optical system 700 according to the seventh embodiment of the present invention may form a focus on the imaging surface 790 . The imaging surface 790 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 790 may refer to one surface of the image sensor IS through which light is received.

Table 13 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between the lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.646 0.850 1.544 56.1 6.463924 S2 9.101 0.081 S3 2nd lens 5.293 0.254 1.680 18.4 -15.3395 S4 3.411 0.179 S5 3rd lens 6.591 0.497 1.535 56.1 23.07 S6 15.526 0.524 S7 4th lens -64.595 0.338 1.680 18.4 -97.78 S8 112.485 0.581 S9 5th lens 14.983 0.340 1.614 25.9 -27.446 S10 8.173 0.443 S11 6th lens 5.944 0.474 1.567 38.0 9.766 S12 -24.303 1.376 S13 7th lens -25.058 0.590 1.535 56.1 -5.573 S14 3.471 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.831 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 700 according to the seventh embodiment of the present invention is 7.48 mm, IMG HT is 7.145 mm, and FOV is 86.8°.

In the seventh embodiment of the present invention, the first lens 710 has a positive refractive power, the first surface of the first lens 710 is convex, and the second surface of the first lens 710 is concave. .

The second lens 720 has negative refractive power, a first surface of the second lens 720 is convex, and a second surface of the second lens 720 is concave.

The third lens 730 has a positive refractive power, a first surface of the third lens 730 is convex, and a second surface of the third lens 730 is concave.

The fourth lens 740 has negative refractive power, and the first and second surfaces of the fourth lens 740 are concave.

The fifth lens 750 has positive refractive power, a first surface of the fifth lens 750 is convex in the paraxial region, and a second surface of the fifth lens 750 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 750 . For example, the first surface of the fifth lens 750 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 750 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 760 has positive refractive power, and the first and second surfaces of the sixth lens 760 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the sixth lens 760 . For example, the first surface of the sixth lens 760 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 760 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 770 has negative refractive power, and the first and second surfaces of the seventh lens 770 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 770 . For example, the first surface of the seventh lens 770 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 770 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 710 to the seventh lens 770 has an aspherical surface coefficient as shown in Table 14. For example, both the object-side surface and the image-side surface of the first lens 710 to the seventh lens 770 are aspheric.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -1.087 20.750 -22.837 -5.840 4.557 28.548 94.246 4th order coefficient (A) 1.104E-01 -1.954E-02 4.122E-02 2.330E-02 7.563E-02 7.697E-02 -2.002E-01 6th order coefficient (B) -4.799E-03 -1.265E-02 3.576E-03 9.512E-03 2.268E-02 2.038E-02 -1.206E-02 8th order coefficient (C) -6.875E-03 -8.313E-03 7.622E-05 -1.140E-03 1.155E-03 2.032E-03 -1.120E-02 Tenth order coefficient (D) -4.018E-03 -2.606E-03 1.106E-03 5.468E-04 -1.025E-04 -8.810E-05 -1.006E-02 12th order coefficient (E) -1.903E-03 -1.188E-03 -1.209E-04 3.477E-04 -2.007E-04 -3.538E-04 -8.335E-03 14th order coefficient (F) -6.119E-04 -5.391E-05 2.215E-04 3.476E-04 1.166E-04 -1.013E-04 -6.322E-03 16th order coefficient (G) -1.342E-04 -1.370E-05 -6.200E-06 1.587E-05 -2.223E-05 -9.833E-05 -4.505E-03 18th order coefficient (H) 3.707E-05 1.455E-05 1.537E-05 -1.907E-05 2.337E-05 -1.187E-05 -3.143E-03 20th order coefficient (J) 3.319E-05 -3.429E-07 3.002E-06 2.063E-06 -2.853E-05 -3.285E-05 -2.030E-03 22nd Coefficient (L) 1.927E-05 -1.507E-05 1.029E-06 8.780E-06 1.847E-05 1.010E-05 -1.277E-03 24th order coefficient (M) 1.191E-06 6.891E-07 1.982E-06 3.957E-07 -4.518E-06 -7.476E-06 -7.106E-04 26th Coefficient (N) -3.265E-06 -6.985E-06 3.819E-06 4.240E-07 1.775E-06 3.719E-06 -3.778E-04 28th order coefficient (O) -1.387E-05 -7.458E-07 -6.887E-06 4.880E-07 -1.607E-06 -5.168E-06 -1.606E-04 30th order coefficient (P) -1.738E-06 -1.325E-06 1.989E-06 -8.642E-07 3.846E-07 1.947E-06 -6.265E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) 81.630 8.394 3.685 2.309 21.486 5.982 -10.502 4th order coefficient (A) -3.156E-01 -9.753E-01 -1.631E+00 -2.326E+00 -8.522E-01 -1.683E+00 -3.900E+00 6th order coefficient (B) 2.910E-02 2.290E-02 2.633E-01 1.892E-01 1.551E-02 1.181E+00 9.829E-01 8th order coefficient (C) 7.040E-03 4.805E-02 3.839E-02 9.713E-02 5.687E-02 -6.154E-01 -2.122E-01 Tenth order coefficient (D) -1.201E-03 3.906E-02 1.164E-02 -1.644E-02 -1.044E-02 2.811E-01 1.226E-01 12th order coefficient (E) -3.042E-03 -1.219E-03 -1.732E-02 -2.036E-02 1.747E-02 -1.141E-01 -7.211E-02 14th order coefficient (F) -7.008E-04 -7.603E-03 3.287E-03 -6.590E-03 -2.149E-03 3.778E-02 1.063E-02 16th order coefficient (G) 4.323E-04 -4.229E-03 6.944E-04 5.571E-03 1.596E-03 -6.615E-04 -1.152E-02 18th order coefficient (H) 7.588E-04 -2.991E-04 -6.043E-03 2.073E-03 5.262E-04 -1.758E-03 1.143E-02 20th order coefficient (J) 5.333E-04 9.678E-04 -5.828E-03 -1.529E-03 -1.390E-03 3.893E-04 -3.524E-03 22nd Coefficient (L) 2.516E-04 6.296E-04 -1.260E-03 -7.385E-04 -2.783E-04 4.451E-03 2.115E-03 24th order coefficient (M) 5.221E-05 1.325E-04 1.313E-03 1.601E-04 -1.850E-04 -3.974E-03 -2.705E-03 26th Coefficient (N) -3.517E-05 -7.676E-05 1.213E-03 1.848E-04 3.695E-06 2.172E-03 8.243E-04 28th order coefficient (O) -3.780E-05 -1.013E-04 3.735E-04 2.972E-05 4.478E-05 -9.904E-04 -4.293E-07 30th order coefficient (P) -1.939E-05 -4.872E-05 5.031E-05 -5.224E-05 2.437E-05 -6.499E-05 4.800E-04

Also, the imaging optical system configured as above may have aberration characteristics shown in FIG. 14 .

An imaging optical system 800 according to an eighth embodiment of the present invention will be described with reference to FIGS. 15 and 16 .

An imaging optical system 800 according to an eighth embodiment of the present invention includes a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, An optical system including a sixth lens 860 and a seventh lens 870 may be included, and may further include a filter 880 and an image sensor IS.

The imaging optical system 800 according to the eighth embodiment of the present invention may form a focus on the imaging surface 890 . The imaging surface 890 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 890 may refer to one surface of the image sensor IS through which light is received.

Table 15 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 2.643 0.837 1.544 56.1 6.463924 S2 9.097 0.069 S3 2nd lens 5.069 0.273 1.680 18.4 -15.3395 S4 3.310 0.193 S5 3rd lens 6.623 0.500 1.535 56.1 23.07 S6 16.452 0.530 S7 4th lens -50.271 0.367 1.680 18.4 -97.78 S8 105.066 0.565 S9 5th lens 15.031 0.340 1.614 25.9 -27.446 S10 8.350 0.445 S11 6th lens 5.946 0.473 1.567 38.0 9.766 S12 -23.667 1.357 S13 7th lens -25.820 0.588 1.535 56.1 -5.573 S14 3.408 0.300 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.818 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 800 according to the eighth embodiment of the present invention is 7.48 mm, the IMG HT is 7.145 mm, and the FOV is 86.8°.

In the eighth embodiment of the present invention, the first lens 810 has a positive refractive power, the first surface of the first lens 810 is convex, and the second surface of the first lens 810 is concave. .

The second lens 820 has negative refractive power, the first surface of the second lens 820 is convex, and the second surface of the second lens 820 is concave.

The third lens 830 has positive refractive power, a first surface of the third lens 830 is convex, and a second surface of the third lens 830 is concave.

The fourth lens 840 has negative refractive power, and the first and second surfaces of the fourth lens 840 are concave.

The fifth lens 850 has negative refractive power, a first surface of the fifth lens 850 is convex in the paraxial region, and a second surface of the fifth lens 850 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 850 . For example, the first surface of the fifth lens 850 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 850 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 860 has a positive refractive power, and the first and second surfaces of the sixth lens 860 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the sixth lens 860 . For example, the first surface of the sixth lens 860 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 860 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 870 has negative refractive power, and the first and second surfaces of the seventh lens 870 are concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 870 . For example, the first surface of the seventh lens 870 may be concave in the paraxial region and convex in parts other than the paraxial region. The second surface of the seventh lens 870 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 810 to the seventh lens 870 has an aspherical surface coefficient as shown in Table 16. For example, both the object-side surface and the image-side surface of the first lens 810 to the seventh lens 870 are aspheric surfaces.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -1.030 21.278 -22.669 -5.823 5.290 31.644 99.000 4th order coefficient (A) 1.123E-01 -1.977E-02 4.165E-02 2.363E-02 7.599E-02 7.687E-02 -2.004E-01 6th order coefficient (B) -3.110E-03 -1.333E-02 3.965E-03 9.188E-03 2.254E-02 2.067E-02 -1.176E-02 8th order coefficient (C) -6.582E-03 -1.000E-02 -4.881E-04 -1.515E-03 1.157E-03 2.414E-03 -1.068E-02 Tenth order coefficient (D) -4.129E-03 -3.108E-03 1.149E-03 5.439E-04 -1.578E-04 -4.776E-05 -9.893E-03 12th order coefficient (E) -2.078E-03 -1.717E-03 -3.321E-04 3.079E-04 -1.817E-04 -2.699E-04 -8.305E-03 14th order coefficient (F) -7.640E-04 -8.311E-05 3.388E-04 3.871E-04 1.034E-04 -9.825E-05 -6.435E-03 16th order coefficient (G) -2.331E-04 -1.177E-04 -3.274E-05 6.293E-06 -8.756E-06 -6.936E-05 -4.699E-03 18th order coefficient (H) -3.527E-05 -4.570E-05 1.941E-05 -2.933E-05 1.354E-05 -1.063E-05 -3.381E-03 20th order coefficient (J) -1.932E-05 -5.697E-05 -1.124E-05 -7.879E-06 -2.302E-05 -1.372E-05 -2.249E-03 22nd Coefficient (L) -1.279E-05 -4.214E-05 2.339E-06 -6.337E-07 1.726E-05 2.031E-06 -1.464E-03 24th order coefficient (M) -1.809E-05 -2.465E-05 -3.699E-06 -4.210E-06 -4.390E-06 -9.870E-06 -8.472E-04 26th Coefficient (N) -9.238E-06 -2.351E-05 -4.674E-06 -4.023E-06 1.823E-06 2.458E-06 -4.649E-04 28th order coefficient (O) -1.509E-05 6.410E-07 1.161E-06 9.689E-07 -1.716E-06 -3.155E-06 -2.031E-04 30th order coefficient (P) -8.110E-06 -9.842E-06 -2.129E-06 -8.954E-07 4.179E-07 1.812E-06 -7.759E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) 99.000 4.104 3.989 2.302 20.424 7.369 -10.889 4th order coefficient (A) -3.152E-01 -9.753E-01 -1.628E+00 -2.330E+00 -8.500E-01 -1.696E+00 -3.907E+00 6th order coefficient (B) 2.966E-02 2.253E-02 2.645E-01 1.896E-01 1.589E-02 1.188E+00 9.846E-01 8th order coefficient (C) 8.541E-03 4.963E-02 3.777E-02 9.740E-02 5.528E-02 -6.134E-01 -1.999E-01 Tenth order coefficient (D) -2.002E-04 3.986E-02 1.100E-02 -1.504E-02 -9.597E-03 2.824E-01 1.244E-01 12th order coefficient (E) -3.064E-03 -8.465E-04 -1.692E-02 -2.052E-02 1.744E-02 -1.178E-01 -7.444E-02 14th order coefficient (F) -1.334E-03 -7.361E-03 3.843E-03 -6.911E-03 -2.686E-03 3.805E-02 9.883E-03 16th order coefficient (G) -4.200E-04 -4.409E-03 4.461E-04 5.531E-03 1.450E-03 -5.655E-06 -1.359E-02 18th order coefficient (H) 6.106E-05 -7.121E-04 -6.154E-03 2.082E-03 5.274E-04 -4.779E-04 1.083E-02 20th order coefficient (J) 3.439E-05 6.578E-04 -5.514E-03 -1.569E-03 -1.449E-03 4.736E-04 -3.994E-03 22nd Coefficient (L) -4.244E-05 5.988E-04 -1.058E-03 -5.876E-04 -1.249E-04 4.918E-03 2.664E-03 24th order coefficient (M) -1.024E-04 2.292E-04 9.785E-04 1.267E-04 -1.872E-04 -4.315E-03 -2.200E-03 26th Coefficient (N) -9.002E-05 5.507E-06 7.460E-04 1.740E-04 5.198E-05 2.215E-03 1.029E-03 28th order coefficient (O) -5.681E-05 -7.276E-05 8.304E-05 1.613E-05 3.724E-05 -1.154E-03 7.107E-05 30th order coefficient (P) -1.483E-05 -5.366E-05 -1.957E-05 -4.312E-05 8.562E-06 -1.384E-04 5.844E-04

Also, the imaging optical system configured as above may have aberration characteristics shown in FIG. 16 .

An imaging optical system 900 according to a ninth embodiment of the present invention will be described with reference to FIGS. 17 and 18 .

An imaging optical system 900 according to a ninth embodiment of the present invention includes a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, An optical system including a sixth lens 960 and a seventh lens 970 may be included, and may further include a filter 980 and an image sensor IS.

The imaging optical system 900 according to the ninth embodiment of the present invention may form a focus on the imaging surface 990 . The imaging surface 990 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 990 may refer to one surface of the image sensor IS through which light is received.

Table 17 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between the lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 1.742 0.608 1.544 56.1 4.2053 S2 6.323 0.100 S3 2nd lens 5.728 0.200 1.680 18.4 -7.86951 S4 2.746 0.031 S5 3rd lens 3.196 0.355 1.535 56.1 10.76147 S6 6.869 0.332 S7 4th lens 24.890 0.210 1.680 18.4 -82.697 S8 17.264 0.407 S9 5th lens 14.191 0.259 1.614 25.9 -15.2761 S10 5.641 0.267 S11 6th lens 3.893 0.340 1.567 38.0 5.69698 S12 -19.104 0.483 S13 7th lens 18.393 0.580 1.544 56.1 -3.95785 S14 1.913 0.161 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.717 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 900 according to the ninth embodiment of the present invention is 4.807 mm, the IMG HT is 4.536 mm, and the FOV is 85°.

In the ninth embodiment of the present invention, the first lens 910 has a positive refractive power, the first surface of the first lens 910 is convex, and the second surface of the first lens 910 is concave. .

The second lens 920 has negative refractive power, the first surface of the second lens 920 is convex, and the second surface of the second lens 920 is concave.

The third lens 930 has positive refractive power, a first surface of the third lens 930 is convex, and a second surface of the third lens 930 is concave.

The fourth lens 940 has negative refractive power, a first surface of the fourth lens 940 is convex, and a second surface of the fourth lens 940 is concave.

The fifth lens 950 has negative refractive power, a first surface of the fifth lens 950 is convex in the paraxial region, and a second surface of the fifth lens 950 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the fifth lens 950 . For example, the first surface of the fifth lens 950 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 950 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 960 has positive refractive power, and the first and second surfaces of the sixth lens 960 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the sixth lens 960 . For example, the first surface of the sixth lens 960 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 960 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 970 has negative refractive power, a first surface of the seventh lens 970 is convex in the paraxial region, and a second surface of the seventh lens 970 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 970 . For example, the first surface of the seventh lens 970 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the seventh lens 970 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 910 to the seventh lens 970 has an aspherical surface coefficient as shown in Table 18. For example, both the object-side surface and the image-side surface of the first lens 910 to the seventh lens 970 are aspherical surfaces.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -1.392 23.221 -23.029 -4.698 0.000 0.000 0.000 4th order coefficient (A) 5.302E-02 -2.581E-02 2.925E-02 1.901E-02 2.180E-02 3.613E-02 -1.284E-01 6th order coefficient (B) -7.942E-03 -1.104E-02 -2.014E-03 4.148E-03 1.793E-02 1.151E-02 -8.042E-03 8th order coefficient (C) -1.729E-03 1.580E-04 1.028E-03 -1.156E-04 5.894E-04 1.188E-03 -1.888E-03 Tenth order coefficient (D) -5.372E-04 -5.970E-04 2.359E-04 -9.511E-04 -2.824E-04 4.936E-04 -3.182E-03 12th order coefficient (E) 7.368E-05 6.114E-05 -2.014E-04 4.637E-05 -2.134E-04 -6.169E-05 -2.073E-03 14th order coefficient (F) -7.417E-05 -1.529E-04 4.658E-05 4.221E-05 7.720E-05 8.482E-05 -1.872E-03 16th order coefficient (G) 3.809E-05 5.854E-05 -1.965E-05 1.292E-04 8.884E-06 -5.462E-05 -9.711E-04 18th order coefficient (H) -4.762E-05 -3.580E-05 3.084E-05 -5.206E-05 2.246E-05 4.319E-05 -7.691E-04 20th order coefficient (J) 3.315E-05 2.039E-05 -1.205E-05 2.067E-05 -1.823E-05 -2.242E-05 -3.407E-04 22nd Coefficient (L) -2.729E-05 -8.078E-06 1.770E-06 -2.094E-05 1.074E-05 1.237E-05 -2.927E-04 24th order coefficient (M) 1.760E-05 3.563E-06 -1.968E-07 1.254E-05 -4.728E-06 -1.168E-05 -1.286E-04 26th Coefficient (N) -4.510E-06 -4.624E-06 7.937E-07 -5.789E-06 4.719E-06 4.219E-06 -1.059E-04 28th order coefficient (O) -3.123E-07 2.822E-06 -9.780E-07 5.448E-07 -3.136E-06 -3.034E-07 -3.119E-05 30th order coefficient (P) 2.261E-07 -5.768E-07 2.768E-07 3.287E-07 6.343E-07 2.050E-07 -2.051E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) 0.000 0.000 0.000 2.266 40.958 0.000 -11.103 4th order coefficient (A) -2.014E-01 -5.810E-01 -1.027E+00 -1.466E+00 -4.951E-01 -1.410E+00 -2.478E+00 6th order coefficient (B) 1.330E-02 -7.437E-03 1.137E-01 6.172E-02 -8.312E-03 6.933E-01 5.864E-01 8th order coefficient (C) 6.226E-03 2.931E-02 6.481E-03 5.748E-02 2.933E-02 -3.324E-01 -7.973E-02 Tenth order coefficient (D) 4.225E-04 2.088E-02 4.822E-03 -7.104E-03 -6.279E-04 1.712E-01 7.419E-02 12th order coefficient (E) -2.033E-03 -1.219E-03 -6.050E-03 -1.281E-02 7.323E-04 -8.433E-02 -4.491E-02 14th order coefficient (F) -1.021E-03 -5.621E-03 4.319E-03 -1.910E-03 -1.974E-04 3.641E-02 1.544E-02 16th order coefficient (G) -3.263E-04 -1.934E-03 2.654E-03 4.363E-03 6.691E-04 -1.268E-02 -4.420E-03 18th order coefficient (H) 1.028E-04 -8.058E-05 -3.372E-03 5.985E-04 9.890E-05 2.147E-03 4.366E-03 20th order coefficient (J) 9.832E-05 7.087E-04 -3.891E-03 -1.108E-03 -2.506E-04 5.232E-04 -2.084E-04 22nd Coefficient (L) 7.072E-05 2.604E-04 -2.169E-03 -5.015E-04 8.532E-05 1.559E-04 2.050E-03 24th order coefficient (M) 5.697E-07 1.740E-04 -9.023E-04 1.589E-04 -1.933E-04 -8.163E-04 6.968E-04 26th Coefficient (N) -8.130E-06 -1.620E-05 -9.251E-04 1.586E-04 8.987E-05 7.713E-04 3.073E-04 28th order coefficient (O) -8.439E-06 -3.225E-05 -7.481E-04 3.238E-06 0.000E+00 -3.412E-04 -4.236E-04 30th order coefficient (P) 2.942E-07 -4.885E-05 -3.420E-04 -2.971E-05 0.000E+00 5.761E-05 -2.284E-04

Also, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 18 .

An imaging optical system 1000 according to a tenth embodiment of the present invention will be described with reference to FIGS. 19 and 20 .

An imaging optical system 1000 according to a tenth embodiment of the present invention includes a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, It includes an optical system including the sixth lens 1060 and the seventh lens 1070, and may further include a filter 1080 and an image sensor IS.

The imaging optical system 1000 according to the tenth embodiment of the present invention may form a focus on the imaging surface 1090 . The imaging surface 1090 may refer to a surface on which a focus is formed by an imaging optical system. For example, the imaging surface 1090 may refer to one surface of the image sensor IS through which light is received.

Table 19 shows the lens characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, index of refraction, Abbe number, focal length).

side number note radius of curvature thickness or distance refractive index Abe number focal length S1 1st lens 1.965 0.684 1.544 56.1 4.736584 S2 7.168 0.100 S3 2nd lens 5.245 0.220 1.680 18.4 -8.53077 S4 2.724 0.057 S5 3rd lens 3.615 0.390 1.535 56.1 12.14607 S6 7.802 0.367 S7 4th lens 32.275 0.250 1.680 18.4 -144.428 S8 24.295 0.465 S9 5th lens 16.081 0.300 1.614 25.9 -17.6063 S10 6.456 0.288 S11 6th lens 4.378 0.400 1.567 38.0 6.398205 S12 -21.282 0.644 S13 7th lens 74.348 0.633 1.544 56.1 -4.2989 S14 2.270 0.161 S15 filter Infinity 0.110 1.518 64.2 S16 Infinity 0.751 S17 imaging plane Infinity

Meanwhile, the total focal length f of the imaging optical system 1000 according to the tenth embodiment of the present invention is 5.402 mm, the IMG HT is 5.107 mm, and the FOV is 85°.

In the tenth embodiment of the present invention, the first lens 1010 has positive refractive power, the first surface of the first lens 1010 is convex, and the second surface of the first lens 1010 is concave. .

The second lens 1020 has negative refractive power, the first surface of the second lens 1020 is convex, and the second surface of the second lens 1020 is concave.

The third lens 1030 has positive refractive power, a first surface of the third lens 1030 is convex, and a second surface of the third lens 1030 is concave.

The fourth lens 1040 has negative refractive power, a first surface of the fourth lens 1040 is convex, and a second surface of the fourth lens 1040 is concave.

The fifth lens 1050 has negative refractive power, a first surface of the fifth lens 1050 is convex in the paraxial region, and a second surface of the fifth lens 1050 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the fifth lens 1050 . For example, the first surface of the fifth lens 1050 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the fifth lens 1050 may be concave in the paraxial region and convex in parts other than the paraxial region.

The sixth lens 1060 has a positive refractive power, and the first and second surfaces of the sixth lens 1060 are convex in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first surface and the second surface of the sixth lens 1060 . For example, the first surface of the sixth lens 1060 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the sixth lens 1060 may be convex in the paraxial region and concave in parts other than the paraxial region.

The seventh lens 1070 has negative refractive power, a first surface of the seventh lens 1070 is convex in the paraxial region, and a second surface of the seventh lens 1070 is concave in the paraxial region.

In addition, at least one inflection point is formed on at least one of the first and second surfaces of the seventh lens 1070 . For example, the first surface of the seventh lens 1070 may be convex in the paraxial region and concave in parts other than the paraxial region. The second surface of the seventh lens 1070 may be concave in the paraxial region and convex in parts other than the paraxial region.

Meanwhile, each surface of the first lens 1010 to the seventh lens 1070 has an aspherical surface coefficient as shown in Table 20. For example, both the object-side surface and the image-side surface of the first lens 1010 to the seventh lens 1070 are aspherical surfaces.

S1 S2 S3 S4 S5 S6 S7 Conic constant (K) -1.328 23.161 -20.854 -4.978 0.000 0.000 0.000 4th order coefficient (A) 6.330E-02 -2.842E-02 3.516E-02 2.004E-02 2.767E-02 3.874E-02 -1.473E-01 6th order coefficient (B) -8.539E-03 -1.252E-02 -3.574E-04 5.203E-03 2.094E-02 1.392E-02 -5.808E-03 8th order coefficient (C) -1.357E-03 -1.397E-04 1.009E-03 -5.272E-05 1.442E-03 1.609E-03 -3.342E-03 Tenth order coefficient (D) -7.471E-04 -7.238E-04 2.811E-04 -9.669E-04 -3.923E-04 5.579E-04 -3.677E-03 12th order coefficient (E) 1.416E-04 -1.898E-05 -1.428E-04 6.439E-06 -2.452E-04 -8.819E-05 -2.826E-03 14th order coefficient (F) -1.230E-04 -1.363E-04 5.395E-05 7.725E-05 1.140E-04 1.019E-04 -2.116E-03 16th order coefficient (G) 7.915E-05 4.569E-05 -1.996E-05 1.184E-04 1.185E-05 -6.324E-05 -1.314E-03 18th order coefficient (H) -7.077E-05 -3.576E-05 1.979E-05 -4.783E-05 2.647E-05 4.106E-05 -8.875E-04 20th order coefficient (J) 4.256E-05 2.240E-05 -6.987E-06 2.088E-05 -2.124E-05 -2.314E-05 -5.094E-04 22nd Coefficient (L) -3.072E-05 -8.907E-06 1.290E-06 -2.240E-05 1.186E-05 2.232E-05 -3.555E-04 24th order coefficient (M) 2.004E-05 3.920E-06 1.282E-07 1.370E-05 -5.498E-06 -9.938E-06 -1.983E-04 26th Coefficient (N) -5.099E-06 -5.227E-06 8.235E-07 -6.162E-06 5.242E-06 1.407E-06 -1.253E-04 28th order coefficient (O) -4.835E-07 3.150E-06 -1.197E-06 6.003E-07 -3.533E-06 -5.023E-06 -5.210E-05 30th order coefficient (P) 2.716E-07 -6.894E-07 3.198E-07 2.784E-07 7.362E-07 2.731E-06 -2.698E-05 S8 S9 S10 S11 S12 S13 S14 Conic constant (K) 0.000 0.000 0.000 2.269 42.013 0.000 -13.288 4th order coefficient (A) -2.105E-01 -6.548E-01 -1.176E+00 -1.646E+00 -5.719E-01 -1.440E+00 -2.704E+00 6th order coefficient (B) 1.657E-02 -1.593E-03 1.175E-01 6.131E-02 -1.441E-02 7.863E-01 6.517E-01 8th order coefficient (C) 5.945E-03 3.277E-02 6.459E-03 6.606E-02 3.546E-02 -3.870E-01 -1.118E-01 Tenth order coefficient (D) -6.151E-05 2.179E-02 5.930E-04 -7.464E-03 -4.208E-04 1.943E-01 7.849E-02 12th order coefficient (E) -1.727E-03 -8.817E-04 -7.778E-03 -1.465E-02 -1.978E-03 -9.163E-02 -4.484E-02 14th order coefficient (F) -7.605E-04 -5.180E-03 2.661E-03 -2.016E-03 -3.240E-04 3.866E-02 1.617E-02 16th order coefficient (G) -1.818E-04 -2.387E-03 1.996E-03 4.938E-03 1.966E-03 -1.378E-02 -4.555E-03 18th order coefficient (H) 1.041E-04 -1.970E-04 -2.279E-03 6.776E-04 5.443E-04 1.403E-03 3.840E-03 20th order coefficient (J) 5.564E-05 5.648E-04 -2.698E-03 -1.254E-03 -3.366E-04 1.399E-03 5.054E-04 22nd Coefficient (L) 3.239E-05 3.475E-04 -1.137E-03 -5.492E-04 3.594E-05 -7.854E-05 2.328E-03 24th order coefficient (M) -1.154E-06 8.681E-05 -5.317E-05 1.644E-04 -2.102E-04 -7.990E-04 2.055E-03 26th Coefficient (N) 4.418E-07 -2.762E-05 1.233E-04 1.837E-04 7.283E-05 9.093E-04 1.934E-03 28th order coefficient (O) -2.697E-06 -3.255E-05 -2.849E-05 -1.493E-06 0.000E+00 -3.879E-04 8.124E-04 30th order coefficient (P) -8.604E-07 -7.194E-06 -2.097E-06 -3.544E-05 0.000E+00 5.069E-05 1.527E-04

Also, the imaging optical system configured as described above may have aberration characteristics shown in FIG. 20 .

In the above, the configuration and characteristics of the present invention have been described based on the embodiments according to the present invention, but the present invention is not limited thereto, and various changes or modifications can be made within the spirit and scope of the present invention. It is apparent to those skilled in the art, and therefore such changes or modifications are intended to fall within the scope of the appended claims.

110, 210, 310, 410, 510, 610, 710, 810, 910, 1010: first lens
120, 220, 320, 420, 520, 620, 720, 820, 920, 1020: second lens
130, 230, 330, 430, 530, 630, 730, 830, 930, 1030: third lens
140, 240, 340, 440, 540, 640, 740, 840, 940, 1040: 4th lens
150, 250, 350, 450, 550, 650, 750, 850, 950, 1050: 5th lens
160, 260, 360, 460, 560, 660, 760, 860, 960, 1060: sixth lens
170, 270, 370, 470, 570, 670, 770, 870, 970, 1070: 7th lens
180, 280, 380, 480, 580, 680, 780, 880, 980, 1080: filter
190, 290, 390, 490, 590, 690, 790, 890, 990, 1090: imaging plane

Claims (16)

A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in order from the object side;
The first lens has a positive refractive power, the second lens has a negative refractive power,
TTL/(2×IMG HT) <0.6; and -0.15 < SAG52/f <0; TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is half of the diagonal length of the imaging surface, and SAG52 is the fifth An SAG value at an end of an effective mirror on an image side surface of a lens, and f is a total focal length of the first lens to the seventh lens.
According to claim 1,
-0.15 < SAG62/f <0; and
-0.25 < SAG72/f <0; satisfies at least one of
SAG62 is the SAG value at the end of the effective mirror on the image side of the sixth lens, and SAG72 is the SAG value at the end of the effective mirror on the image side of the seventh lens.
According to claim 1,
At least three of the first to seventh lenses have a refractive index greater than 1.61.
According to claim 3,
An imaging optical system in which lenses having a refractive index greater than 1.61 each have a negative refractive power.
According to claim 3,
The second lens and the fourth lens each have a refractive index greater than 1.67 and a negative refractive power.
According to claim 1,
25 < v1-v2 <45;
25 < v1-v4 <45; and
15 < v1-v6 <25; satisfies at least one of
v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v4 is the Abbe number of the fourth lens, and v6 is the Abbe number of the sixth lens.
According to claim 1,
0 < f1/f <1.4; and -10 < f2/f < 0, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
According to claim 7,
0 < f3/f <50; and -50 < f4/f < 0, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
According to claim 7,
3 <|f5/f|/100; 0 < f6/f <1.4; and -0.9<f7/f<0, where f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.
According to claim 1,
TTL/f <1.3; and BFL/f <0.3;
BFL is the distance on the optical axis from the image-side surface of the seventh lens to the imaging surface.
According to claim 1,
D1/f<0.1 is satisfied, and D1 is a distance on an optical axis between an image-side surface of the first lens and an object-side surface of the second lens.
According to claim 1,
FOV×((2×IMG HT)/f) ≤ 170°, and FOV is an angle of view of the imaging optical system.
According to claim 1,
An imaging optical system that satisfies (TTL/(2×IMG HT))×(TTL/f) < 0.62.
According to claim 1,
n2+n4+n5 > 4.8, n2 is the refractive index of the second lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens.
According to claim 1,
The third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, and the seventh lens has negative refractive power. optics.
According to claim 15,
The first lens has a convex object-side surface and a concave image-side surface,
The second lens has a convex object-side surface and a concave image-side surface,
The third lens is an imaging optical system having a convex object-side surface and a concave image-side surface.

Images