KR102258458B1 - Omnidirectional zoom optical system that can be used in day and night and can change magnification - Google Patents

Abstract

The present invention relates to an omnidirectional zoom optical system, and more specifically, to an omnidirectional zoom optical system in which there is no chromatic aberration, excellent imaging performance, and an angle of view changes according to a change in magnification by using four mirrors.
The present invention can provide an omnidirectional zoom optical system capable of reducing the size of a product by using four mirrors without chromatic aberration, excellent imaging performance, and shortening the length of the optical system.
In addition, the present invention can provide an omnidirectional zoom optical system capable of simultaneously using a visible light region and a far-infrared ray region at the same time as the angle of view changes according to the magnification change through the movement of the mirror, and can be used at the same time in the daytime and at night.
In addition, the present invention provides an omnidirectional zoom optical system capable of simultaneously measuring the visible and far-infrared regions because the raw material cost is reduced and the manufacturing time is shortened, and the manufacturing cost is reduced by using only four mirrors without using a lens. I can.

Description

Omnidirectional zoom optical system that can be used in day and night and can change magnification}

The present invention relates to an omnidirectional zoom optical system, and more specifically, to an omnidirectional zoom optical system in which there is no chromatic aberration, excellent imaging performance, and an angle of view changes according to a change in magnification by using four mirrors.

The omni-directional optical system is an optical system capable of shooting both above and below, that is, above and below the horizon for 360 degrees. Compared to the fisheye lens, which is famous for its wide viewing angle, the fisheye lens shoots 180 degrees in front of the optical system, and the omnidirectional optical system can shoot the top and bottom of both sides except the front.

Optical systems capable of accommodating a wide field of view are still being studied. The first wide field of view optics began in 1794 when the panorama was known by Robert Barker. After that, an omnidirectional camera using a number of cameras appeared from 1987, and a reflective and refractive omnidirectional camera using a trapezoidal mirror or a conical mirror appeared from the 1990s (Korean Patent Laid-Open Patent No. 10-2017-0071010, Korean Registered Patent No. 10-0934719, Korean Registered Patent No. 10-1469060).

However, the existing omnidirectional optical system is mainly composed of a lens system and is expensive because it uses aspherical lenses or multiple lenses, and due to the nature of the lens, information of the image is partially expanded in the process of expanding and partially expanding the output image. It is bound to be lost.

In addition, the focal length of the lens changes according to the wavelength and chromatic aberration occurs, the visible light region and the far infrared region cannot be used at the same time, and a lens group including one or more lenses must be moved when an image needs to be enlarged.

Korean Patent Publication No. 10-2017-0071010 Korean Patent Registration No. 10-0934719 Korean Patent Registration No. 10-1469060

The present invention is to solve the problems of the prior art, and by using four mirrors, there is no chromatic aberration, excellent imaging performance, and to provide an omnidirectional zoom optical system capable of reducing the size of a product by shortening the length of the optical system. have.

In addition, an object of the present invention is to provide an omnidirectional zoom optical system that can use only one mirror to change the angle of view according to a change in magnification, can be used at the same time in the daytime and at night, and can simultaneously use the visible and far-infrared regions.

In addition, the present invention provides an omnidirectional zoom optical system capable of simultaneously measuring the visible and far-infrared regions because the raw material cost is reduced and the manufacturing time is reduced, and the manufacturing cost is reduced by using only four mirrors without using a lens. It is aimed at.

In order to achieve the above object, the present invention reflects light incident from an object to a second aspherical mirror, has a convex shape toward the object, and has a hole in the center of the first spherical mirror;

A second aspherical mirror positioned in a direction of light reflected from the first spherical mirror, reflecting light incident from the first spherical mirror to a third aspherical mirror, and having a concave shape in the direction of the incident light;

It is located in a direction opposite to the direction in which the second aspherical mirror is located with respect to the first spherical mirror, reflects light incident from the second aspherical mirror to a fourth aspherical mirror, and has a convex shape in the direction of the incident light. A third aspherical mirror; And

It is located between the first spherical mirror and the third aspherical mirror, reflects light incident from the third aspherical mirror to form an image on the imaging device, has a concave shape in the direction of the incident light, and has a hole in the center. It provides an omnidirectional zoom optical system in which an angle of view changes according to a change in magnification including an aspherical mirror.

In one embodiment of the present invention, the omnidirectional zoom optical system is characterized in that it has a light receiving unit composed of one spherical mirror and one aspherical mirror, and an imaging unit composed of two aspherical mirrors.

In one embodiment of the present invention, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 1.31.2 <

<1.3

(Where f _tele is the effective focal length when the optical system observes the telephoto end, f _wide Is the effective focal length when the optical system observes the wide-angle end.)

In one embodiment of the present invention, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 4.9 (Wide mode)4.5 <

<4.9 (Wide mode)

< 4.5 (Normal mode)4.1 <

<4.5 (Normal mode)

< 4.0 (Tele mode) 3.6 <

<4.0 (Tele mode)

(Here, f _imaging is the effective focal length of the optical system imaging unit, and f _{concentrating} is the effective focal length of the optical system light receiving unit.)

In one embodiment of the present invention, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 1.0 (Wide mode) 0.6 <

<1.0 (Wide mode)

< 1.1 (Normal mode)0.7 <

<1.1 (Normal mode)

< 1.4 (Tele mode) 0.9 <

<1.4 (Tele mode)

(Here l _imaging Is the distance between the aspherical mirrors of the optical system imaging part, l _{concentrating} Is the distance between the spherical mirror and the aspherical mirror of the optical system light-receiving unit.)

In one embodiment of the present invention, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 5.8 (Wide mode) 5.4 <

<5.8 (Wide mode)

< 5.4 (Normal mode) 5.0 <

<5.4 (Normal mode)

< 4.7 (Tele mode) 4.3 <

<4.7 (Tele mode)

(Here l _imaging Is the distance between the aspherical mirrors of the optical system imaging part, and f _{concentrating} Is the effective focal length of the optical system light receiving unit.)

The present invention can provide an omnidirectional zoom optical system capable of reducing the size of a product by shortening the length of the optical system and having no chromatic aberration, excellent imaging performance, and reducing the size of the product by using four mirrors.

In addition, the present invention can provide an omni-directional zoom optical system capable of simultaneously using a visible light region and a far-infrared ray region by changing the angle of view according to the magnification change through the movement of the mirror, which can be used at the same time in the daytime and at night.

In addition, the present invention provides an omnidirectional zoom optical system capable of simultaneously measuring the visible and far-infrared regions because the raw material cost is reduced and the manufacturing time is reduced, and the manufacturing cost is reduced by using only four mirrors without using a lens. I can.

1 shows an omnidirectional zoom optical system of the present invention.
2 shows an optical layout according to an embodiment of the present invention.
3 shows a ray aberration according to an embodiment of the present invention.
4 shows an optical layout according to an embodiment of the present invention.
5 shows a ray aberration according to an embodiment of the present invention.
6 shows an optical layout according to an embodiment of the present invention.
7 shows a ray aberration according to an embodiment of the present invention.
8 shows an optical layout according to an embodiment of the present invention.
9 shows a ray aberration according to an embodiment of the present invention.
10 shows an optical layout according to an embodiment of the present invention.
11 shows a ray aberration according to an embodiment of the present invention.
12 shows an optical layout according to an embodiment of the present invention.
13 shows a ray aberration diagram according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail based on the drawings and examples. The terms, drawings, examples, etc. used in the present invention are merely exemplified to describe the present invention in more detail and to aid the understanding of those skilled in the art, and the scope of the present invention is limited thereto and should not be interpreted. .

Technical terms and scientific terms used in the present invention represent the meanings commonly understood by those of ordinary skill in the art, unless otherwise defined.

1 shows an omnidirectional zoom optical system in which the angle of view changes according to a change in magnification of the present invention.

The omnidirectional optical system of the present invention includes a first spherical mirror 100; A second aspherical mirror 200; A third aspherical mirror 300; And a fourth aspherical mirror 400.

The existing omnidirectional optical system is mainly composed of a lens system and uses aspherical lenses or multiple lenses, so manufacturing cost is high.

In addition, the focal length of the lens changes according to the wavelength and chromatic aberration occurs, and the visible ray region and the far infrared ray region cannot be used simultaneously.

The present invention can provide an omnidirectional zoom optical system capable of reducing the size of a product by shortening the length of the optical system and having no chromatic aberration, excellent imaging performance, and reducing the size of the product by using four mirrors.

In addition, the present invention can provide an omnidirectional zoom optical system that changes the angle of view according to the magnification change through the movement of the mirror, and can be used at the same time in the daytime and at night.

In addition, the present invention provides an omnidirectional zoom optical system capable of simultaneously measuring the visible and far-infrared regions because the raw material cost is reduced and the manufacturing time is reduced, and the manufacturing cost is reduced by using only four mirrors without using a lens. I can.

The first spherical mirror 100 reflects light incident from an object to a second spherical mirror, has a convex shape toward the object, and has a hole 110 in the center.

The second aspherical mirror 200 is located in the direction of light reflected from the first spherical mirror 100, reflects light incident from the first spherical mirror to the third aspherical mirror 300, and incident light It has a concave shape in the direction of.

The second aspherical mirror converts the angle of view reflected from the first spherical mirror into a narrow angle and sends it to the imaging unit, and may shorten the length of the optical system by changing the direction of the light beam.

The light rays reflected from the second aspherical mirror pass through the holes of the first spherical mirror and the holes of the fourth aspherical mirror and are then reflected from the third aspherical mirror.

The third aspherical mirror 300 is located in a direction opposite to the direction in which the second aspherical mirror 200 is located with respect to the first spherical mirror 100, and the light incident from the second aspherical mirror is converted to a fourth aspherical surface. It is reflected by the mirror 400 and has a convex shape in the direction of incident light.

An aperture stop 500 may be provided between the third aspherical mirror and the fourth aspherical mirror, and the aperture stop 500 may be replaced with a hole in the fourth aspherical mirror.

The third aspherical mirror may shorten the length of the optical system by changing the direction of the light beam.

In addition, the third aspherical mirror 300 serves to make the position of the image pickup device super-planar with respect to the light beam reflected from the second aspherical mirror.

The fourth aspherical mirror 400 is positioned between the first spherical mirror and the third aspherical mirror, and reflects light incident from the third aspherical mirror to form an image on the imaging device 600.

The imaging device 600 may be a Charge Coupled Device (CCD) or Complementary Metal-oxide Semiconductor (CMOS) type for visible light, and a Microbolometer or Mercury-Cadmium-Telluride (MCT) or Indium antimonide (InSb) for far-infrared light I can. A cover glass for protecting the imaging device may be disposed above the imaging device 600 and is protected from the cover glass.

At this time, the first spherical mirror 100 and the second aspherical mirror 200 form a light receiving part, and the third aspherical mirror 300 and the fourth aspherical mirror 400 form an imaging part.

The present invention can change the imaging performance by adjusting the distance between the mirrors, the radius of curvature of the mirrors, etc., and can reduce the size of the product by shortening the length of the optical system.

In the present invention, a donut-shaped image can be observed in an imaging device, and an image is concentrated in a central region of the donut shape. In this case, the magnification can be changed through the movement of the mirror, and the image is enlarged or reduced accordingly. Can be obtained.

In the present invention, by moving the mirror, the effective focal length of the omnidirectional zoom optical system, the effective focal length of the light receiving unit, the effective focal length of the imaging unit, the distance between the mirrors of the light receiving unit, and the distance between the mirrors of the imaging unit are adjusted.

At this time, the hole diameter of the first spherical mirror 100 was 20 mm, and the shielding diameter of the fourth aspherical mirror 400 was adjusted to 21.6 mm.

The present invention moves the first spherical mirror M1 and the third aspherical mirror M3, or by moving the first spherical mirror M1, the second aspherical mirror M2, and the third aspherical mirror M3. The imaging performance of the zoom optical system was evaluated.

In the table below, Case 1 refers to the case of moving M1 and M3, and Case 2 refers to the case of moving M1, M2, and M3, and both Case 1 and Case 2 performed three examples, and each example Was performed in Wide mode, Normal mode and Tele mode.

Table 1 shows the effective focal length of the omnidirectional zoom optical system according to the movement of the mirror.

One 2 3 Wide Normal Tele Wide Normal Tele Wide Normal Tele Case 1
(M1, M3) 2.4224 2.6192 2.9974 2.4240 2.6211 2.9995 2.4272 2.6326 3.0224 Case 2
(M1, M2, M3) 2.4255 2.6352 3.0271 2.4261 2.6321 3.0215 2.4263 2.6358 3.0306

Table 2 shows the effective focal length of the light receiving unit according to the movement of the mirror.

One 2 3 Wide Normal Tele Wide Normal Tele Wide Normal Tele Case 1
(M1, M3) 7.6158 8.2262 9.3958 7.6158 8.2271 9.3964 7.5933 8.2268 9.4250 Case 2
(M1, M2, M3) 7.5822 8.2299 9.4335 7.5971 8.2330 9.4313 7.5360 8.1776 9.3820

Table 3 shows the effective focal length of the imaging part according to the movement of the mirror.

One 2 3 Wide Normal Tele Wide Normal Tele Wide Normal Tele Case 1
(M1, M3) 35.8273 35.8193 35.8037 35.8489 35.8403 35.8249 35.8218 35.8132 35.7976 Case 2
(M1, M2, M3) 35.8170 35.8029 35.7873 35.7964 35.7877 35.7722 35.9932 35.9843 35.9686

Table 4 shows the distance between the mirrors of the light receiving unit according to the movement of the mirror.

One 2 3 Wide Normal Tele Wide Normal Tele Wide Normal Tele Case 1
(M1, M3) 52.6756 45.6578 34.7584 52.6756 45.6488 34.7534 57.0890 49.5049 37.9474 Case 2
(M1, M2, M3) 58.0892 50.2670 38.5844 57.3132 49.6921 38.1217 59.2508 51.3667 39.4792

Table 5 shows the distance between the mirrors of the imaging unit according to the movement of the mirror.

One 2 3 Wide Normal Tele Wide Normal Tele Wide Normal Tele Case 1
(M1, M3) 43.0002 43.0039 43.0111 43.0002 43.0041 43.0113 42.9941 42.9981 43.0054 Case 2
(M1, M2, M3) 43.0050 43.0115 43.0187 43.0430 43.0470 43.0542 42.9474 42.9515 42.9587

2 shows an optical layout of an omnidirectional zoom optical system of the present invention, and FIG. 3 shows a ray aberration (Example 1).

Example 1 corresponds to Case 1-1 of Tables 1 to 5, and was performed in Wide mode, Normal mode and Tele mode.

In FIG. 2, the upper part corresponds to the Wide mode, the middle part corresponds to the Normal mode, and the lower part corresponds to the Tele mode. At this time, the viewing angle of the red line is the smallest, and the viewing angle increases as the green line, blue line, and brown line go.

3 shows a ray aberration diagram according to the viewing angle in Wide mode, Normal mode, and Tele mode, and in each mode, red, green, blue, and brown lines are shown from bottom to top.

At all viewing angles of each mode, the ray aberration degree indicates a very low value, which means that the imaging performance is excellent.

Table 6 shows the RDN data of the omnidirectional zoom optical system according to Example 1, and Table 7 shows the characteristics of the aspherical mirror of the omnidirectional zoom optical system according to Example 1.

At this time, '1' is the first spherical mirror 100, '2' is the second aspherical mirror 200,'stop' is the aperture aperture 500, '4' is the third aspherical mirror 300, and '5' Denotes the fourth aspherical mirror 400, respectively.

Surface # Surface type Radius Thickness H-Ape Refract Mode Object Sphere Infinity Infinity Refract One Sphere 110 -52.6756 62.5
[H:11] Reflect 2 Asphere 26.1927 82.7330 13.9728 Reflect Stop Sphere Infinity 43.0005 7.5 Refract 4 Asphere 29.0861 -43.0002 10.8 Reflect 5 Asphere 81.8584 153.1569 62.5
[H:11] Reflect Image Sphere Infinity 0.0221 3.5 Refract

Surface # 2 4 5 Surface type Asphere Asphere Asphere Conic Constant -0.7215 0.7822 -0.1348 ASP Coefficient 4th -3.6146e-007 -9.4663e-006 -1.1365e-008 6th 1.3919e-008 -1.1120e-008 -1.6588e-012 8th -5.0875e-011 3.2546e-012 -4.9237e-017 10th 6.9949e-014 -7.0701e-014 -3.3352e-020 12th - - -6.7378e-024 14th - - 7.5940e-028 16th - - 5.9877e-032

4 shows an optical layout of the omnidirectional zoom optical system of the present invention, and FIG. 5 shows a ray aberration (Example 2).

Example 2 corresponds to Case 1-2 of Tables 1 to 5, and was performed in Wide mode, Normal mode and Tele mode.

In FIG. 4, the upper part corresponds to the Wide mode, the middle part corresponds to the Normal mode, and the lower part corresponds to the Tele mode. At this time, the viewing angle of the red line is the smallest, and the viewing angle increases as the green line, blue line, and brown line go.

5 shows a ray aberration diagram according to the viewing angle in Wide mode, Normal mode, and Tele mode, and in each mode, red lines, green lines, blue lines, and brown lines are shown from bottom to top.

At all viewing angles of each mode, the ray aberration degree indicates a very low value, which means that the imaging performance is excellent.

Table 8 shows the RDN data of the omnidirectional zoom optical system according to Example 2, and Table 9 shows the characteristics of the aspherical mirror of the omnidirectional zoom optical system according to Example 2.

Surface # Surface type Radius Thickness H-Ape Refract Mode Object Sphere Infinity Infinity Refract One Sphere 110 -52.6756 62.5
[H:11] Reflect 2 Asphere 26.1927 82.7330 13.9738 Reflect Stop Sphere Infinity 43.0005 7.5 Refract 4 Asphere 29.1118 -43.0002 10.8 Reflect 5 Asphere 81.87 153.1569 62.5
[H:11] Reflect Image Sphere Infinity 0.0221 3.5 Refract

Surface # 2 4 5 Surface type Asphere Asphere Asphere Conic Constant -0.7215 0.7881 -0.1332 ASP Coefficient 4th -3.6146e-007 -9.3852e-006 -1.1498e-008 6th 1.3919e-008 -1.1120e-008 -1.6588e-012 8th -5.0875e-011 3.2546e-012 -4.9237e-017 10th 6.9949e-014 -7.0701e-014 -3.3352e-020 12th - - -1.3963e-023 14th - - 5.6563e-027 16th - - -8.6117e-031

6 shows an optical layout of the omnidirectional zoom optical system of the present invention, and FIG. 7 shows a ray aberration (Example 3).

Example 3 corresponds to Case 1-3 of Tables 1 to 5, and was performed in Wide mode, Normal mode and Tele mode.

In FIG. 6, the upper part corresponds to the Wide mode, the middle part corresponds to the Normal mode, and the lower part corresponds to the Tele mode. At this time, the viewing angle of the red line is the smallest, and the viewing angle increases as the green line, blue line, and brown line go.

7 shows a ray aberration diagram according to the viewing angle in Wide mode, Normal mode and Tele mode, and in each mode, red lines, green lines, blue lines, and brown lines are shown from bottom to top.

At all viewing angles of each mode, the ray aberration degree indicates a very low value, which means that the imaging performance is excellent.

Table 10 shows the RDN data of the omnidirectional zoom optical system according to Example 3, and Table 11 shows the characteristics of the aspherical mirror of the omnidirectional zoom optical system according to Example 3.

Surface # Surface type Radius Thickness H-Ape Refract Mode Object Sphere Infinity Infinity Refract One Sphere 110 -52.0890 62.5
[H:11] Reflect 2 Asphere 27.1954 82.7330 14.0355 Reflect Stop Sphere Infinity 42.9944 7.5 Refract 4 Asphere 29.0861 -42.9941 10.8 Reflect 5 Asphere 81.8462 153.1569 62.5
[H:11] Reflect Image Sphere Infinity 0.0221 3.5 Refract

Surface # 2 4 5 Surface type Asphere Asphere Asphere Conic Constant -0.7215 0.7822 -0.1348 ASP Coefficient 4th -3.6146e-007 -9.4663e-006 -1.1365e-008 6th 1.3919e-008 -1.1120e-008 -1.6588e-012 8th -5.0875e-011 3.2546e-012 -4.9237e-017 10th 6.9949e-014 -7.0701e-014 -3.3352e-020 12th - - -6.7377e-024 14th - - 1.4633e-027 16th - - -1.8484e-031

8 shows an optical layout of the omnidirectional zoom optical system of the present invention, and FIG. 9 shows a ray aberration (Example 4).

Example 4 corresponds to Case 2-1 of Tables 1 to 5, and was performed in Wide mode, Normal mode and Tele mode.

In FIG. 8, the upper part corresponds to the Wide mode, the middle part corresponds to the Normal mode, and the lower part corresponds to the Tele mode. At this time, the viewing angle of the red line is the smallest, and the viewing angle increases as the green line, blue line, and brown line go.

9 shows ray aberration diagrams according to viewing angles in Wide mode, Normal mode and Tele mode, and in each mode, red lines, green lines, blue lines, and brown lines are shown from bottom to top.

At all viewing angles of each mode, the ray aberration degree indicates a very low value, which means that the imaging performance is excellent.

Table 12 shows the RDN data of the omnidirectional zoom optical system according to Example 4, and Table 13 shows the characteristics of the aspherical mirror of the omnidirectional zoom optical system according to Example 4.

Surface # Surface type Radius Thickness H-Ape Refract Mode Object Sphere Infinity Infinity Refract One Sphere 110 -52.0892 62.5
[H:11] Reflect 2 Asphere 27.4028 82.7330 14.1352 Reflect Stop Sphere Infinity 43.0053 7.5 Refract 4 Asphere 29.0861 -43.0050 10.8 Reflect 5 Asphere 81.8584 153.1569 62.5
[H:11] Reflect Image Sphere Infinity 0.0221 3.5 Refract

Surface # 2 4 5 Surface type Asphere Asphere Asphere Conic Constant -0.7215 0.7822 -0.1348 ASP Coefficient 4th -3.6146e-007 -9.4663e-006 -1.1365e-008 6th 1.3919e-008 -1.1120e-008 -1.6588e-012 8th -5.0875e-011 3.2546e-012 -4.9237e-017 10th 6.9949e-014 -7.0701e-014 -3.3352e-020 12th - - -6.7378e-024 14th - - 7.5940e-028 16th - - 5.9877e-032

10 shows an optical layout of the omnidirectional zoom optical system of the present invention, and FIG. 11 shows a ray aberration (Example 5).

Example 5 corresponds to Case 2-2 of Tables 1 to 5, and was performed in Wide mode, Normal mode and Tele mode.

In FIG. 10, the upper part corresponds to the Wide mode, the middle part corresponds to the Normal mode, and the lower part corresponds to the Tele mode. At this time, the viewing angle of the red line is the smallest, and the viewing angle increases as the green line, blue line, and brown line go.

11 shows a ray aberration diagram according to the viewing angle in Wide mode, Normal mode, and Tele mode, and in each mode, red, green, blue, and brown lines are shown from bottom to top.

At all viewing angles of each mode, the ray aberration degree indicates a very low value, which means that the imaging performance is excellent.

Table 14 shows the RDN data of the omnidirectional zoom optical system according to Example 5, and Table 15 shows the characteristics of the aspherical mirror of the omnidirectional zoom optical system according to Example 5.

Surface # Surface type Radius Thickness H-Ape Refract Mode Object Sphere Infinity Infinity Refract One Sphere 110 -57.3132 62.5
[H:11] Reflect 2 Asphere 27.2619 82.7330 14.0774 Reflect Stop Sphere Infinity 43.0433 7.5 Refract 4 Asphere 29.0861 -43.0430 10.8 Reflect 5 Asphere 81.8989 153.1569 62.5
[H:11] Reflect Image Sphere Infinity 0.0221 3.5 Refract

Surface # 2 4 5 Surface type Asphere Asphere Asphere Conic Constant -0.7250 0.7822 -0.1338 ASP Coefficient 4th -3.6146e-007 -9.4663e-006 -1.1510e-008 6th 1.3919e-008 -1.1120e-008 -1.6588e-012 8th -5.0875e-011 3.2546e-012 -4.9237e-017 10th 6.9949e-014 -7.0701e-014 -3.3352e-020 12th - - -1.4639e-023 14th - - 6.4250e-027 16th - - -1.0605e-030

12 shows an optical layout of the omnidirectional zoom optical system of the present invention, and FIG. 13 shows a ray aberration (Example 6).

Example 6 corresponds to Case 2-3 of Tables 1 to 5, and was performed in Wide mode, Normal mode and Tele mode.

In FIG. 12, the upper part corresponds to the Wide mode, the middle part corresponds to the Normal mode, and the lower part corresponds to the Tele mode. At this time, the viewing angle of the red line is the smallest, and the viewing angle increases as the green line, blue line, and brown line go.

13 shows ray aberration diagrams according to viewing angles in Wide mode, Normal mode and Tele mode, and in each mode, red lines, green lines, blue lines, and brown lines are shown from bottom to top.

At all viewing angles of each mode, the ray aberration degree indicates a very low value, which means that the imaging performance is excellent.

Table 16 shows the RDN data of the omnidirectional zoom optical system according to Example 6, and Table 17 shows the characteristics of the aspherical mirror of the omnidirectional zoom optical system according to Example 6.

Surface # Surface type Radius Thickness H-Ape Refract Mode Object Sphere Infinity Infinity Refract One Sphere 110 -59.2508 62.5
[H:11] Reflect 2 Asphere 27.5359 82.7330 13.9986 Reflect Stop Sphere Infinity 42.9477 7.5 Refract 4 Asphere 29.2781 -42.9474 10.8 Reflect 5 Asphere 81.8735 153.1569 62.5
[H:11] Reflect Image Sphere Infinity 0.0221 3.5 Refract

Surface # 2 4 5 Surface type Asphere Asphere Asphere Conic Constant -0.7250 0.8088 -0.1343 ASP Coefficient 4th -3.6146e-007 -9.4546e-006 -1.1455e-008 6th 1.3919e-008 -1.1120e-008 -1.6588e-012 8th -5.0875e-011 3.2546e-012 -4.9237e-017 10th 6.9949e-014 -7.0701e-014 -3.3352e-020 12th - - -1.2578e-023 14th - - 5.1554e-027 16th - - -8.4489e-031

The omnidirectional zoom optical systems of Examples 1 to 6 have no chromatic aberration, excellent imaging performance, and shorten the length of the optical system to reduce the size of the product.

In addition, the angle of view changes according to the magnification change through the movement of a specific mirror, and it can be used at the same time during the day and at night, and the visible and far-infrared areas can be used simultaneously.

For the omnidirectional zoom optical systems of Examples 1 to 6, the effective focal length when the optical system observes the telephoto end, the effective focal distance when the optical system observes the wide-angle end, the effective focal length of the optical system imaging unit, and the effective focus of the optical system light receiving unit The relationship was shown by measuring the distance, the distance between the aspherical mirror of the optical system imaging unit, and the distance between the spherical mirror and the aspherical mirror of the optical system light receiving unit (Table 18).

Case 1 (M1, M3) Case 2 (M1, M2, M3) One 2 3 One 2 3

1.2374 1.2374 1.2452 1.2480 1.2454 1.2491

Wid: 4.7043
Nor: 4.3543
Tel: 3.8106 Wid: 4.7072
Nor: 4.3564
Tel: 3.8126 Wid: 4.7176
Nor: 4.3532
Tel: 3.7982 Wid: 4.7238
Nor: 4.3503
Tel: 3.7936 Wid: 4.7119
Nor: 4.3469
Tel: 3.7929 Wid: 4.7762
Nor: 4.4003
Tel: 3.8338

Wid: 0.8163
Nor: 0.9419
Tel: 1.2374 Wid: 0.8163
Nor: 0.9421
Tel: 1.2376 Wid: 0.7531
Nor: 0.8686
Tel: 1.1333 Wid: 0.7403
Nor: 0.8557
Tel: 1.1149 Wid: 0.7510
Nor: 0.8663
Tel: 1.1294 Wid: 0.7248
Nor: 0.8362
Tel: 1.0881

Wid: 5.6462
Nor: 5.2277
Tel: 4.5777 Wid: 5.6462
Nor: 5.2271
Tel: 4.5774 Wid: 5.6621
Nor: 5.2266
Tel: 4.5629 Wid: 5.6718
Nor: 5.2262
Tel: 4.5602 Wid: 5.6657
Nor: 5.2286
Tel: 4.5650 Wid: 5.6990
Nor: 5.2523
Tel: 4.5788

The omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 1.31.2 <

<1.3

(Where f _tele is the effective focal length when the optical system observes the telephoto end, f _wide Is the effective focal length when the optical system observes the wide-angle end.)

In addition, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 4.9 (Wide mode)4.5 <

<4.9 (Wide mode)

< 4.5 (Normal mode)4.1 <

<4.5 (Normal mode)

< 4.0 (Tele mode) 3.6 <

<4.0 (Tele mode)

(Here, f _imaging is the effective focal length of the optical system imaging unit, and f _{concentrating} is the effective focal length of the optical system light receiving unit.)

In addition, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 1.0 (Wide mode) 0.6 <

<1.0 (Wide mode)

< 1.1 (Normal mode)0.7 <

<1.1 (Normal mode)

< 1.4 (Tele mode) 0.9 <

<1.4 (Tele mode)

(Here l _imaging Is the distance between the aspherical mirrors of the optical system imaging part, l _{concentrating} Is the distance between the spherical mirror and the aspherical mirror of the optical system light-receiving unit.)

In addition, the omnidirectional zoom optical system is characterized in that it satisfies the following equation.

< 5.8 (Wide mode) 5.4 <

<5.8 (Wide mode)

< 5.4 (Normal mode) 5.0 <

<5.4 (Normal mode)

< 4.7 (Tele mode) 4.3 <

<4.7 (Tele mode)

(Here l _imaging Is the distance between the aspherical mirrors of the optical system imaging part, and f _{concentrating} Is the effective focal length of the optical system light receiving unit.)

When the omnidirectional zoom optical system of the present invention satisfies the above equation, there is no chromatic aberration, excellent imaging performance, and shortening the length of the optical system can reduce the size of the product.

100: first spherical mirror 110: hole of the first spherical mirror
200: second spherical mirror 300: third aspherical mirror
400: fourth aspherical mirror 500: aperture stop
600: image pickup device

Claims (6)

A first spherical mirror reflecting light incident from an object to a second aspherical mirror, having a convex shape toward the object and having a hole in the center thereof;
A second aspherical mirror positioned in a direction of light reflected from the first spherical mirror, reflecting light incident from the first spherical mirror to a third aspherical mirror, and having a concave shape in the direction of the incident light;
It is located in a direction opposite to the direction in which the second aspherical mirror is located with respect to the first spherical mirror, reflects light incident from the second aspherical mirror to a fourth aspherical mirror, and has a convex shape in the direction of the incident light. A third aspherical mirror; And
It is located between the first spherical mirror and the third aspherical mirror, reflects light incident from the third aspherical mirror to form an image on the imaging device, has a concave shape in the direction of the incident light, and has a hole in the center. In the omnidirectional zoom optical system in which the angle of view changes according to a change in magnification including an aspherical mirror,
It has a light-receiving part composed of one spherical mirror and one aspherical mirror and an imaging part composed of two aspherical mirrors,
An omnidirectional zoom optical system in which the angle of view changes according to a change in magnification, characterized in that it satisfies the following equation.

1.2 <

<1.3
(Here, f _tele is the effective focal length when the optical system observes the telephoto end, and f _wide is the effective focal length when the optical system observes the wide-angle end.)
delete delete The method of claim 1,
An omnidirectional zoom optical system in which the angle of view changes according to a change in magnification, characterized in that it satisfies the following equation.

4.5 <

<4.9 (Wide mode)
4.1 <

<4.5 (Normal mode)
3.6 <

<4.0 (Tele mode)
(Here f _imaging Is the effective focal length of the imaging part of the optical system, and f _{concentrating} Is the effective focal length of the optical system light receiving unit.)
The method of claim 1,
An omnidirectional zoom optical system in which the angle of view changes according to a change in magnification, characterized in that the following equation is satisfied.

0.6 <

<1.0 (Wide mode)
0.7 <

<1.1 (Normal mode)
0.9 <

<1.4 (Tele mode)
(Here l _imaging Is the distance between the aspherical mirrors of the optical system imaging part, l _{concentrating} Is the distance between the spherical mirror and the aspherical mirror of the optical system light-receiving unit.)
The method of claim 1,
An omnidirectional zoom optical system in which the angle of view changes according to a change in magnification, characterized in that the following equation is satisfied.

5.4 <

<5.8 (Wide mode)
5.0 <

<5.4 (Normal mode)
4.3 <

<4.7 (Tele mode)
(Here l _imaging Is the distance between the aspherical mirrors of the optical system imaging part, and f _{concentrating} Is the effective focal length of the optical system light receiving unit.)

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