KR101503592B1 - Omnidirectional optical apparatus - Google Patents

Abstract

An omnidirectional optical device according to an embodiment of the present invention includes a first optical element including a first reflecting surface reflecting incident light and a refracting surface transmitting and refracting incident light, A second optical element including a second reflective surface for reflecting the incident light reflected by the first reflective surface to the refracting surface, and a second optical element arranged on the first optical element for reflecting the incident light reflected from the second reflective surface, Wherein the first reflecting surface and the refracting surface are formed on a continuous surface on the first optical element object side.

Description

[0001] OMNIDIRECTIONAL OPTICAL APPARATUS [0002]

The present invention relates to an optical device, and more particularly, to an omnidirectional optical device capable of observing the entire 360 °.

In general, a device for photographing images in the left and right 360 ° directions around the device is called a omnidirectional camera, and has been used mainly as a surveillance camera by photographing natural scenery or utilizing a CCD or CMOS type camera. Conventionally, a method of obtaining an omnidirectional image has been used by using a refraction refraction method using a hemispherical concave mirror or by increasing a refraction angle by using a fisheye lens.

However, in the conventional method, there is a problem that the image is blurred by the phenomenon that the focal distances in the respective directions do not match each other, that is, the spherical aberration, by obtaining incident light that is first processed by being reflected on the mirror surface or refracted by the lens.

In order to solve such a problem, Korean Patent No. 10-0934719 discloses a method of acquiring an omnidirectional image using a catadioptric lens and re-processing incident light, which is first processed from a catadioptric lens, into a plurality of relay lenses And the focal distance of the incident light incident on each direction is set to be the same.

However, such a catadioptric lens requires a high level of operation due to difficulty in lens processing, which causes a problem of high defect rate in the production of parts, and further, it is difficult to mass-produce and there is a disadvantage that the unit cost is high. In addition, when the catadioptric lens is mounted on a separate bracket for mounting on a camera, scratches may be generated on the contact surface.

Korean Patent No. 10-0934719

The omnidirectional optical device according to an embodiment of the present invention has the following problems in order to solve the above-described problems.

An object of an embodiment of the present invention is to provide an omnidirectional optical apparatus that is high in mass productivity and low in unit cost by providing an optical component that is easy to process.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

An omnidirectional optical device according to an embodiment of the present invention includes a first optical element including a first reflecting surface reflecting incident light and a refracting surface transmitting and refracting incident light, A second optical element including a second reflective surface for reflecting the incident light reflected by the first reflective surface to the refracting surface, and a second optical element arranged on the first optical element for reflecting the incident light reflected from the second reflective surface, Wherein the first reflecting surface and the refracting surface are formed on a continuous surface on the first optical element object side and the second reflecting surface is formed on the entire upper surface of the second optical element.

Preferably, the continuous surface is an aspheric surface, a spherical surface, or a plane surface, the refracting surface is formed at a center portion of the continuous surface, and the first reflection surface is formed at a peripheral portion of the continuous surface.

The first reflective surface may be formed of a metal coating, and the refracting surface may be formed of an anti-reflective coating.

It is preferable that the second reflecting surface is an aspheric surface, a spherical surface, or a plane surface.

The image forming unit may be formed of a plurality of lenses, and at least one of the lenses may be an aspherical lens.

The image forming unit may be formed of a plurality of lenses, and at least one of the lenses may be formed of a plastic material.

In the omnidirectional optical device according to an embodiment of the present invention, it is preferable that the following equation is satisfied, where R is the curvature of the first reflection surface and D is the shortest distance between the refraction surface and the second reflection surface .

In the following expression, f _reflect is the _combined focal length of the first optical element and the second optical element, and f _total is the combined focal length of the omnidirectional optical device The total composite focal length.

The omnidirectional optical device according to an embodiment of the present invention preferably satisfies the following equation, where R1 is a curvature of the refracting surface and R2 is a curvature of a surface of the first optical element opposed to the refracting surface.

The image forming section includes a diaphragm, a first lens group disposed between the first optical element and the diaphragm, and a second lens group disposed between the diaphragm and the image sensor, wherein the omnidirectional optical device F1 is a combined focal length of the first optical element and the first lens group, and f2 is a focal length of the second lens group.

The omnidirectional optical device according to the present invention can reduce the machining cost by forming the reflection surface reflecting the incident light and the refracting surface transmitting and refracting the incident light on the same continuous surface so that the reflection surface and the refracting surface can be simultaneously processed.

Furthermore, since the eccentricity between the reflecting surface and the refracting surface can be eliminated by simultaneous processing of the reflecting surface and the refracting surface, the optical performance can be improved.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the following description.

1 and 2 are sectional views of an omnidirectional optical device according to a first embodiment of the present invention.
3 is a lateral aberration view of the omnidirectional optical device according to the first embodiment of the present invention.
4 is a cross-sectional view of an omnidirectional optical device according to a second embodiment of the present invention.
5 is a lateral aberration view of the omnidirectional optical device according to the second embodiment of the present invention.
6 is a cross-sectional view of an omnidirectional optical device according to a third embodiment of the present invention.
7 is a lateral aberration view of the omnidirectional optical device according to the third embodiment of the present invention.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprising" or "comprising" or the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Also, suffixes "module", "unit" and "part" for the components used in the present specification are given or mixed in consideration of ease of specification, and each component having its own distinct meaning or role no.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

Hereinafter, a configuration of an omnidirectional optical device according to the present invention will be described with reference to FIG. 1 is a cross-sectional view of an omnidirectional optical device according to a first embodiment of the present invention.

1, the omnidirectional optical device according to the present invention includes a first optical element 100, a second optical element 200, a concave portion 300, a cover glass 400, and an image sensor (not shown) Image sensor 500). The first reflecting surface 110 included in the first optical element 100 reflects incident light that is first incident on the optical device from all directions to the second optical element 200. The second optical element 200 reflects the incident light reflected from the first reflecting surface 110 to the refracting surface 120 included in the first optical element 100. The incident light incident on the refraction surface 120 forms an image of the incident light on the image sensor 500 through the imaging element 300. In this case, the image sensor 500 may be a CCD (Charged Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) type. A cover glass 400 for protecting the image sensor 500 may be disposed on the image sensor 500. The cover glass 400 is generally formed of a glass material having a predetermined refractive index.

Hereinafter, each configuration of the omnidirectional optical device according to the present invention will be described separately.

The first optical element 100 has a general lens shape and is preferably composed of BSC7 optical glass having a refractive index of about 1.52 (587.56 nm wavelength standard). 1, a continuous surface is formed on the object side of the first optical element 100, and the first reflective surface 110 and the refracting surface 120 are formed on the continuous surface. As described above, the first reflecting surface 110 serves to reflect the incident light firstly incident on the optical device from all directions to the second optical element 200, and the refracting surface 120 serves to reflect the incident light from the second optical element 200 And reflects and reflects the incident light. Therefore, the refracting surface 120 is preferably formed at the center of the continuous surface, and the first reflecting surface 110 is preferably formed at the peripheral portion of the continuous surface.

As described above, if only one reflecting surface for reflecting the incident light incident from the omnidirection is provided, the shape precision of the reflecting surface can be easily measured. In addition, even if the processing is erroneous, only the erroneously processed optical element can be discarded or reworked, thereby reducing the cost. Particularly, when the first reflecting surface 110 and the refracting surface 120 are located on the same continuous surface as in the present invention, the first reflecting surface 110 and the refracting surface 120 can be processed at a time, have. Further, the first reflecting surface 110 is formed by metal coating on the peripheral portion of the continuous surface, and the refracting surface 120 is formed by performing anti-reflection coating on the center portion of the continuous surface, thereby making the first optical element 100 more easily Processing becomes possible. In addition, by simultaneously processing the first reflection surface 110 and the refraction surface 120, it is possible to eliminate the eccentricity between the two surfaces, so that high optical performance can be expected.

The first optical element 100 is formed on the object side and the continuous surface including the first reflective surface 110 and the refracting surface 120 is formed into a spherical surface or a plane having a convex shape toward the object side as shown in Fig. . If the continuous surface is formed as a hemispherical surface or a flat surface as described above, the continuous surface can be easily processed by a general lens processing equipment, thereby reducing the processing cost. Furthermore, it has the advantage of being able to easily measure the lens characteristics with a general interferometer. In addition, the continuous surface including the first reflecting surface 110 and the refracting surface 120 may be an aspherical surface. Since the first reflecting surface 110 and the refracting surface 120 are on a continuous surface, The machining and measurement of the discontinuity surface can be facilitated.

The second optical element 200 is disposed on the object side of the first optical element 100. It is preferable that only a colorless gas is injected or maintained in a vacuum state between the second optical element 200 and the first optical element 100. [ In this case, since there is no separate optical component between the first optical element 100 and the second optical element 200, it is advantageous to reduce the weight of the entire optical device, and further, the manufacturing cost can be reduced.

The second optical element 200 includes a second reflecting surface 210 for receiving the incident light reflected by the first reflecting surface 110 and reflecting the incident light to the refracting part 120. The second reflecting surface 210 is preferably spherical or planar. If the second reflecting surface 210 is formed in a spherical or planar shape, it is possible to easily process the second reflecting surface 210 with a general lens processing equipment, thereby reducing the processing cost. Furthermore, it has the advantage of being able to easily measure the lens characteristics with a general interferometer. On the other hand, the second reflecting surface 210 may employ an aspherical surface to enhance the optical resolution performance.

The imaging element 300 is disposed on the upper side of the first optical element 100 and functions to image the incident light reflected from the second reflective surface 210 on the image sensor 500. The imaging unit 300 generally includes a plurality of lenses and a diaphragm 310. The plurality of lenses includes a first lens group 320 disposed between the first optical element 100 and the diaphragm 310, And a second lens group 330 disposed between the image sensor 310 and the image sensor 500. The first lens group 320 may be integrated with the first optical element 100 and the second lens group 330 may be integrally formed with the first optical element 100 due to the diaphragm 310, As shown in FIG.

In particular, at least one of the plurality of lenses can reduce the total length of the omnidirectional optical device and increase the optical performance by applying the aspherical lens. Also, at least one of the plurality of lenses may be made of a plastic material to reduce the weight of the omnidirectional optical device, thereby further reducing the cost.

The omnidirectional optical device according to the present invention preferably satisfies the following expression (1).

값이 작은 경우는, 제 1반사면(110)의 곡률(R)이 큰 경우를 의미하므로 결국 제 1반사면(110)은 평면에 가깝게 됨을 의미한다. 이러한 경우 자오면 방향의 화각을 넓히기 어려워지므로 촬영 영역이 좁아지게 될 것이다. 반대로

값이 큰 경우는, 굴절면(120)과 제 2반사면(210) 사이의 거리(D)가 커지게 되므로 광학계 전체의 크기가 커지게 된다. 따라서

값이 상기 수학식 1의 수치 범위를 충족하게 되면 넓은 화각과 작은 크기의 광학계를 만들 수 있게 된다.
1, D is the shortest distance between the refracting surface 120 and the second reflecting surface 210, that is, the distance between the apexes of the refracting surface 120 at the apex of the second reflecting surface 210, And R denotes a curvature of the first reflecting surface 110. In Equation (1)

When the value is small, it means that the curvature R of the first reflection surface 110 is large, which means that the first reflection surface 110 is close to the plane. In such a case, it is difficult to widen an angle of view in the direction of the meridian direction, so that the shooting region will be narrowed. Contrary

When the value is large, the distance D between the refracting surface 120 and the second reflecting surface 210 becomes large, and the size of the entire optical system becomes large. therefore

When the value satisfies the numerical range of the above-mentioned formula (1), it is possible to produce an optical system having a wide viewing angle and a small size.

Further, it is preferable that the omnidirectional optical device according to the present invention satisfies the following expression (2).

값이 작아지는 경우, 제 1반사면(110)의 곡률이 작아지는 것을 의미하므로 제 1반사면(110)에 대한 가공 정밀도 및 조립 공차가 엄격해지는 문제가 있다. 반대로,

값이 커지는 경우, 제 1반사면(110)의 곡률이 커지는 것을 의미하므로 자오면 방향의 화각이 제한되고, 제 1반사면(110)의 초점거리가 길어지게 되므로 제품의 크기가 커지게 되는 문제가 있다. 따라서

값이 상기 수학식 2를 만족하게 되면 가공이 용이하고 크기도 줄일 수 있는 전방위 광학 장치의 제작이 가능하게 된다.
f _reflect is the _combined focal length of the first optical element 100 and the second optical element 200, and f _total is the combined focal length of the entire omnidirectional optical device. In the above equation

If the value is smaller, it means that the curvature of the first reflecting surface 110 is reduced, and thus there is a problem that the processing accuracy and assembly tolerance of the first reflecting surface 110 become strict. Contrary,

If the value is larger, it means that the curvature of the first reflection surface 110 is larger, so that the angle of view in the meridional direction is limited and the focal length of the first reflection surface 110 becomes longer, have. therefore

It is possible to manufacture an omnidirectional optical device that can be easily processed and reduced in size.

Further, the omnidirectional optical device according to the present invention preferably satisfies the following expression (3).

값이 작은 경우, R2가 작아지는 것을 의미하는데, 이 값이 지나치게 작아지게 되면 반구에 가까워지므로 가공이 불가능할 수 있다. 나아가 결상부(300)에 포함되는 렌즈의 구경에도 제약을 주게 되므로 수차 보정 및 조립성에도 문제가 발생할 수 있다. 반대로,

값이 큰 경우, 굴절면(120)의 곡률(R1)이 큰 것을 의미하고, 상술한 바와 같이 굴절면(120)과 제 1반사면(110)은 동일한 연속면상에 위치하므로 결국 제 1반사면(110)의 곡률 또한 커지게 되는데, 제 1반사면(110)의 곡률이 크게 되면 자오면 화각이 제한되는 문제점이 발생하게 된다. 따라서

값이 상기 수학식 3을 충족하게 되면 가공이 용이할 뿐만 아니라 넓은 화각을 갖는 전방위 광학 장치를 제공할 수 있게 된다.
Equation 3 is a mathematical expression for securing the workability and the angle of view of the first optical element 100. R1 is the curvature of the refracting surface 120 and R2 is the curvature of the first optical element 100 facing the refracting surface And the curvature of the surface 130. In Equation 3,

If the value is small, it means that R2 becomes small. If this value becomes too small, it may become impossible to process because it is close to the hemisphere. Furthermore, since the aperture of the lens included in the imaging element 300 is restricted, aberration correction and assembling may also be problematic. Contrary,

The refracting surface 120 and the first reflecting surface 110 are located on the same continuous surface as described above and thus the first reflecting surface 110 When the curvature of the first reflection surface 110 is increased, there arises a problem that the angle of view of the meridional plane is limited. therefore

When the value satisfies Equation (3), it is possible to provide an omnidirectional optical device having a wide angle of view as well as easy processing.

Further, it is preferable that the omnidirectional optical device according to the present invention satisfies the following expression (4).

가 작은 경우, 이는 조리개(310) 앞쪽에 위치한 광학 부품들의 초점거리(f1)가 길어지는 것이므로 제 1반사면(120)의 곡률이 커지게 된다. 반대로

가 큰 경우, 이는 조리개(310) 앞쪽에 위치한 광학 부품들의 초점거리(f1)가 짧아지는 것이므로 제 1반사면(120)의 곡률이 작아지게 된다. 결국, 수학식 4를 만족하게 되면 원하는 화각 범위에 대해 안정된 광학성능을 갖는 전방위 광학 장치를 제공할 수 있게 된다.
Equation (4) is a formula for the ratio of the combined focal lengths of the optical components located at the front and rear of the diaphragm 310, where f1 is a composite focal length of the first optical element 100 and the combined focal point of the first lens group 320 And f2 is the focal length of the second lens group 330. [ In Equation (4)

The focal length f1 of the optical components positioned in front of the diaphragm 310 becomes long, so that the curvature of the first reflection surface 120 becomes large. Contrary

The curvature of the first reflecting surface 120 is reduced because the focal length f1 of the optical components positioned in front of the stop 310 is shortened. As a result, when Equation (4) is satisfied, it is possible to provide an omnidirectional optical device having stable optical performance over a desired angle of view range.

Hereinafter, various embodiments of the omnidirectional optical device according to the present invention will be described with reference to FIG. 2 to FIG.

Fig. 2 is a cross-sectional view of the first embodiment of the present invention, and Fig. 3 is a lateral aberration view of the first embodiment. Reference numerals 1a to 1p denoted in FIG. 2 are marks for distinguishing the refracting surface and the reflecting surface of the optical components included in the first embodiment of the present invention. The refracting surface and the reflecting surface of the optical component employed in the omnidirectional optical device according to the first embodiment of the present invention are all spherical except for the refracting surfaces 1o and 1p and the second reflecting surface 1b of the cover glass. The refracting surfaces are all made of glass.

Table 1 below is a parameter for each surface 1a to 1p of the omni-directional optical device shown in Fig.

Surface Radius (mm) Thickness (mm) Index Abbe Number Note 1a 19,000 -11.00 Reflect 1b INF 11.00 Reflect 1c 19,000 5.30 1.516798 64.20 Same as 1a 1d 3.100 0.70 1e 5.710 1.80 1.755200 27.53 1f 3.000 7.003 1g INF 0.700 iris 1h -25.726 1.50 1.617998 63.39 1i -6.244 0.200 1j 15.352 1.30 1.620409 60.34 1k -15.352 0.453 1l 5.506 2.75 1.620409 60.34 1m -5.506 2.75 1.755200 27.53 1n 3.000 4.544 1o INF 0.20 1.516798 64.20 Cover glass 1p INF 0.108 Cover glass

In the table, Surface represents the sign of each surface of the optical components included in the omnidirectional optical device, Index represents the refractive index, and Abbe Number represents the dispersion constant. 2, an effective focal length (EFL) of 1.0 mm, an F-Number of 2.8, and a Half Field of View (HFOV) of 32.1 DEG to 107 DEG were obtained. It is possible to design an omni-directional optical device having

3 is a lateral aberration diagram according to a half angle of view when the parameters of Table 1 are applied to the omnidirectional optical device according to the first embodiment of the present invention. That is, the transverse aberration at the uppermost stage is a lateral aberration diagram when the half angle of view of the omnidirectional optical system according to the first embodiment of the present invention is the maximum of 107 °, and the lateral aberration at the lowermost stage is 32.1 ° . The lateral aberration on the left represents the lateral aberration on the tangential plane, and the right lateral aberration represents the lateral aberration on the saggital plane. Specifically, the vertical axis represents the degree of aberration on the basis of the principal ray, and the axis of abscissa represents the distance of the light incident on the principal ray. That is, the left region indicates the lower light ray with respect to the vertical axis, and the right region indicates the upper ray. In particular, in the case of the transverse aberration on the saggital plane, only the right region is shown based on the vertical axis, and the left region is omitted because it is symmetrical with the right region. Further, the dotted line in the transverse aberration diagram represents the C-line (wavelength: 656.27 nm), the solid line is the D-line (wavelength: 487.56 nm), and the one dotted line is the transverse aberration of the F-line (wavelength: 486.13 nm).

FIG. 4 is a sectional view of a second embodiment of the present invention, and FIG. 5 is a lateral aberration view of the second embodiment. Reference numerals 2a to 2n denoted in Fig. 4 are marks for distinguishing the refracting surface and the reflecting surface of the optical components included in the second embodiment of the present invention. In the case of the refracting surface and the reflecting surface of the optical component employed in the omnidirectional optical device according to the second embodiment of the present invention, the refracting surfaces 2m and 2n and the second reflecting surface 2b of the cover glass are formed in a plane, And the other is formed as a spherical surface. The refracting surfaces are all made of glass.

Table 2 below is a parameter for each of the surfaces 2a to 2n of the omni-directional optical device shown in Fig.

Surface Radius (mm) Thickness (mm) Index Abbe Number Note 2a 19,000 -11.00 Reflect 2b INF 11.00 Reflect 2c 19.00 5.30 1.516798 64.20 Same as 2a 2d 3.134 0.800 2e 6.213 1.80 1.755200 27.53 2f 3.134 6.919 2g INF 1,000 iris 2h 11.141 2.30 1.589129 61.25 2i -5.563 0.922 Aspherical surface 2j 5.421 2.75 1.620409 60.34 2k -5.421 2.75 1.755200 27.53 2l 3.134 4.46 2m INF 0.20 1.516798 64.20 Cover glass 2n INF 0.108 Cover glass

The description of each parameter in Table 2 and the result of applying the parameters in Table 2 is the same as that described in Table 1 described above. However, as described above, in the omnidirectional optical device according to the second embodiment of the present invention, the 2i plane is formed as an aspheric surface, and specific parameters are as follows.

Surface K A B C 2i -One 3.802814E-04 5.422201E-06 -2.363892E-07

In Table 3, K denotes a conic constant, and A to C denote higher order aspheric coefficients.

5 is a lateral aberration diagram according to the half angle of view when the parameters of Table 2 and Table 3 are applied to the omnidirectional optical device according to the second embodiment of the present invention. The description of the lateral aberration diagram of FIG. 5 is the same as that of FIG. 3 described above, and thus will not be described.

FIG. 6 is a cross-sectional view of a third embodiment of the present invention, and FIG. 7 is a lateral aberration view of the third embodiment. Reference numerals 3a to 3n denoted in FIG. 6 are marks for distinguishing the refracting surface and the reflecting surface of the optical parts included in the third embodiment of the present invention. The refracting surface and the reflecting surface of the optical component employed in the omnidirectional optical device according to the third embodiment of the present invention are all except the refracting surfaces 3m and 3n and the second reflecting surface 3b, 3h and 3i surfaces of the cover glass And is formed into a spherical surface. Particularly, the optical component including the 3h surface and the 3i surface is formed of plastic, and all the other refracting surfaces are formed of a glass material.

Table 4 is a parameter for each surface 3a to 3n of the omnidirectional optical device shown in Fig. 6, and Table 5 below is an aspherical surface parameter of the 3h surface and the 3i surface formed as an aspheric surface. Descriptions of the parameters and descriptions of the results of applying the parameters are the same as those described in Table 2 and Table 3, and thus will not be described.

Surface Radius (mm) Thickness (mm) Index Abbe Number Note 3a 19,000 -11.00 Reflect 3b INF 11.00 Reflect 3c 19,000 5.30 1.516798 64.20 Same as 2a 3d 3.217 0.700 3e 5.903 1.80 1.846664 23.78 3f 3.060 6.486 3g INF 1.400 iris 3h 9.905 2.30 1.531200 56.51 Aspherical surface 3i -5.048 1.031 Aspherical surface 3j 5.903 2.75 1.696803 55.46 3k -5.9031 2.75 1.805181 25.46 3l 3.217 4.48 3m INF 0.20 1.516798 64.20 Cover glass 3n INF 0.105 Cover glass

Surface K A B C 3h -One -1.938064E-04 0 0 3i -One 3.125684E-04 6.216083E-06 -6.954559E-07

7 is a lateral aberration diagram according to a half angle of view when the parameters of Table 4 and Table 5 are applied to the omnidirectional optical device according to the third embodiment of the present invention. The description of the lateral aberration diagram of Fig. 7 is the same as that of Fig. 3 described above, and thus will not be described.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not intended to limit the scope of the present invention but to limit the scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. It should be interpreted.

100: first optical element 110: first reflection surface
120: refracting surface 200: second optical element
210: second reflecting surface 300: concave surface
310: diaphragm 320: first lens group
330: second lens group 400: cover glass
500: Image sensor

Claims (10)

A first optical element (100) including a first reflective surface (110) that reflects incident light and a refracting surface (120) that transmits and refracts incident light;
And a second reflective surface (210) that is disposed on the object side of the first optical element (100) and reflects the incident light reflected by the first reflective surface (110) to the refracting surface (120) 2 optical element 200; And
And an imaging element (300) arranged on the first optical element (100) for imaging the incident light reflected from the second reflective surface (210)
The first reflecting surface 110 and the refracting surface 120 are formed on a continuous surface on the object side of the first optical element 100,
The second reflective surface 210 is formed on the entire upper surface of the second optical element 200,
The following expression is satisfied.

In this formula,
R is a curvature of the first reflecting surface 110,
D is the shortest distance between the refracting surface 120 and the second reflecting surface 210.
The method according to claim 1,
The continuous surface may be aspherical, spherical or planar,
The refracting surface 120 is formed at the center of the continuous surface,
Wherein the first reflection surface (110) is formed at a peripheral portion of the continuous surface.
The method according to claim 1,
The first reflective surface 110 is formed of a metal coating,
Wherein the refracting surface (120) is formed of an anti-reflection coating.
The method according to claim 1,
Wherein the second reflecting surface (120) is an aspheric surface, a spherical surface, or a plane surface.
The method according to claim 1,
The imaging element 300 is formed of a plurality of lenses,
Wherein at least one of the lenses is an aspherical lens.
The method according to claim 1,
The imaging element 300 is formed of a plurality of lenses,
Wherein at least one of the lenses is made of a plastic material.
delete The method according to claim 1,
The following expression is satisfied.

In this formula,
f _reflect is the _combined focal length of the first optical element 100 and the second optical element 200,
f _total is the combined focal length of the whole omnidirectional optical device.
The method according to claim 1,
The following expression is satisfied.

In this formula,
R1 is the curvature of the refracting surface 120,
And R2 is a curvature of a surface 130 of the first optical element 100 facing the refracting surface.
The method according to claim 1,
The imaging element (300)
A diaphragm 310;
A first lens group (320) disposed between the first optical element (100) and the diaphragm (310); And
And a second lens group (330) disposed between the diaphragm (310) and the image sensor (500)
The following expression is satisfied.

In this formula,
f1 is the combined focal length of the first optical element 100 and the first lens group 320,
and f2 is a focal length of the second lens group.

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