WO2018070680A1 - Wide-angle lens and wide-angle lens group - Google Patents

Wide-angle lens and wide-angle lens group Download PDF

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Publication number
WO2018070680A1
WO2018070680A1 PCT/KR2017/010222 KR2017010222W WO2018070680A1 WO 2018070680 A1 WO2018070680 A1 WO 2018070680A1 KR 2017010222 W KR2017010222 W KR 2017010222W WO 2018070680 A1 WO2018070680 A1 WO 2018070680A1
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lens
section
cross
lens cross
concave
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PCT/KR2017/010222
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French (fr)
Korean (ko)
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정은진
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레이콜
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Definitions

  • the present invention relates to a wide viewing angle lens and a lens group applicable to a closed circuit television camera (CCTV) and the like, and to a lens and a lens group contributing to obtaining a wide viewing angle image without distortion.
  • CCTV closed circuit television camera
  • a camera is a device for condensing light reflected from a subject through a lens to fix an image at a specific position.
  • digital cameras in which the film is replaced by a digital image sensor, are widely used in the structure of the first camera. Referring to Figure 1 it can be easily understood the structure of a general digital camera.
  • a closed circuit TV camera used for security can monitor a large area using one camera.
  • Cameras used for surveillance to achieve this purpose may employ wide-angle lenses, such as fisheye lenses.
  • the image caused by the fisheye lens has a severe distortion problem.
  • another example of a camera structure for achieving the object of the wide viewing angle is disclosed in Korean Patent Publication No. 2013-0037883.
  • the Patent Publication employs a structure in which a wide range of light can be focused into the camera by using a reflective structure in the camera lens to capture a wide range.
  • a conventional wide-view angle camera structure has an advantage that can shoot a wide range, but as a fatal disadvantage, there is a problem that the image being photographed is distorted. Therefore, since an image processing module for correcting the distorted image needs to be added, it is structurally complicated, and since an image processing time is required, there is a problem that a delay occurs in the shooting time and the final image output time. In addition, the addition of the image processing module has the disadvantage that the camera manufacturing cost increases.
  • the object of the present invention is to draw out to solve the above problems
  • a wide viewing angle lens is a wide viewing angle lens for focusing light from a subject.
  • the fisheye lens cross section is disposed on one plane, and the fisheye lens cross section is angled about an imaginary rotation axis which is perpendicular to the horizontal line passing through the center of the fisheye lens cross section and spaced apart from the fisheye lens cross section in the horizontal direction. It is characterized by a point formed by a three-dimensional trajectory obtained by rotating in a range.
  • a wide viewing angle lens has a concave lens end face disposed on one plane, and is perpendicular to a horizontal line passing through the center of the concave lens end face and the convex lens end face. It is characterized in that it is formed as a three-dimensional trajectory obtained by rotating the concave lens end face in a predetermined angle range about an imaginary rotational axis arranged to be spaced apart from the lens end face in the horizontal direction.
  • a wide viewing angle lens group according to another embodiment of the present invention is a wide viewing angle lens group that condenses light from a subject.
  • a fisheye lens cross section, a concave lens cross section, and a convex lens cross section are sequentially arranged on one plane, and are perpendicular to a straight line connecting the centers of the fisheye lens cross section, the concave lens cross section, and the convex lens cross section, from the convex lens cross section.
  • the wide viewing angle lens and the lens group according to the present invention provide an effect that greatly contributes to the manufacture of a camera capable of innovative wide viewing angle photography by forming a focused distortion-free image on a curved surface.
  • 1 is a view showing the principle of a general digital camera.
  • FIG. 2 is a view showing the principle that the cylinder lens forms an image.
  • FIG. 3 is a view showing the arrangement of the lens group according to the present invention.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG.
  • FIG. 5 is a view showing an arrangement structure of a lens group according to another embodiment of the present invention.
  • FIG. 6 is an exploded perspective view illustrating a three-dimensional structure of the lens of the lens group illustrated in FIG. 5.
  • FIG. 7 is a view showing a lens configuration according to another embodiment of the present invention.
  • FIG. 8 is a view showing a lens configuration according to another embodiment of the present invention.
  • FIG. 3 is a view showing the arrangement of the lens group according to the present invention.
  • 4 is a cross-sectional view taken along the line IV-IV shown in FIG.
  • a wide viewing angle lens group (hereinafter referred to as a "lens group") according to an embodiment of the present invention, a fisheye lens 20, a concave lens 30, and a convex lens 40. It includes.
  • the lens group collects light reflected from the subject 100.
  • the lens constituting the lens group of the present invention includes a plurality of lenses.
  • the lens constituting the lens group of the present invention is a shape in which the rod-shaped lens is reworked in a curved shape with a constant curvature.
  • a rod-shaped lens is a cylinder lens.
  • a cylinder lens is a type of lens having a different radius between the X and Y axes.
  • the cylinder lens 200 may be configured in a semi-cylindrical form as shown in FIG. 2, for example.
  • the cylinder lens 200 may be manufactured in a cylindrical shape.
  • the cylinder lens does not form a focused image based on a single point, but forms a focused image along a line.
  • the cylinder lens is curved only in one axial direction, and light is focused only in one axial direction because the other axial direction is not curved. Therefore, the cylinder lens 200 shown in FIG. 2 forms a straight line image in the Y-axis direction.
  • FIG. 2 The principle that an image is formed in the image sensor 300 by the light reflected from the subject 100 passing through the cylinder lens can be easily understood with reference to FIG. 2.
  • the object 100 is symmetrically changed in the left and right directions X when it is formed in the image sensor 300 after passing through the cylinder lens and passing through the aperture 400.
  • the subject 100 passing through the cylinder lens is formed in the image sensor 300, it does not change symmetrically in the longitudinal direction Y.
  • the present invention provides a lens capable of forming a wider viewing angle image remarkably than a conventional lens by processing the rod-shaped lens once again into a curved shape so that both the X-axis and Y-axis directions are curved.
  • the lens group according to the present invention forms an image without distortion, when applied to a device such as a closed circuit camera (CCTV), software for image correction is not required, thus reducing manufacturing costs and enabling fast image processing. .
  • CCTV closed circuit camera
  • the lens group is a component that plays a role corresponding to the needle hole in principle of the camera.
  • conventional lenses form an image at one focal point
  • the lens group employed in the present invention is characterized in that it is configured to form an image on a curve. That is, in the present invention, the lens group plays a role of extending the needle hole in a slit form on the principle of the camera. Therefore, the lens group functions to form a wide viewing angle image on the curved surface without distortion. That is, the lens group simultaneously performs a unique role of a lens that concentrates light and a slit-shaped needle hole.
  • the fisheye lens 20, the concave lens 30, and the convex lens 40 may have a fisheye lens cross-section 22, a concave lens cross-section 32, and a convex on the basis of the virtual rotation axis 50.
  • the lens cross section 42 is a lens formed by rotating in a predetermined angle range as a three-dimensional trajectory. That is, it is assumed that the fisheye lens end face 22, the concave lens end face 32, and the convex lens end face 42 are disposed on one plane as shown in FIG. In addition, it is assumed that a virtual rotary shaft 50 is disposed to be spaced apart from the convex lens end face 42 in the opposite direction to the concave lens end face 32.
  • the rotation axis 50 is an imaginary axis perpendicular to a straight line connecting the centers of the fisheye lens end face 22, the concave lens end face 32, and the convex lens end face 42.
  • the fisheye lens 20 is a lens formed with a three-dimensional trajectory obtained by rotating the fisheye lens end surface 22 by a predetermined angle with respect to the rotation axis 50.
  • the concave lens 30 is a lens formed by a three-dimensional trajectory obtained by rotating the concave lens end face 32 about a certain angle range about the rotation axis 50.
  • the convex lens 40 is a lens formed by a three-dimensional trajectory obtained by rotating the convex lens end face 42 about a predetermined angle range about the rotation axis 50. For example, FIG.
  • FIG. 3 shows an arrangement structure of a lens group formed by a three-dimensional trajectory obtained by rotating the lens cross section shown in FIG. 4 in a range of 180 ° with respect to the rotation axis 50.
  • the fisheye lens 20, the concave lens 30, and the convex lens 40 may be combined into one lens device by one frame or barrel (not shown).
  • the image obtained by the lens group is formed on a curved surface to form an image that is not distorted. Therefore, when manufacturing a camera employing the lens group, the image sensor 300 should also be configured in a curved form.
  • the image sensor 300 outputs an image formed by the lens group as an electrical signal.
  • the electrical signal of the image sensor 300 may be a current or a voltage.
  • a CCD sensor or a CMOS sensor may be employed as the image sensor 300.
  • the image sensor 300 is formed in a curved surface to correspond to the focal length of the lens group.
  • the image sensor 300 may be formed by attaching an image sensor having a fine size on a curved member. Meanwhile, the image sensor 300 may directly form a CCD or CMOS circuit by applying a continuous semiconductor manufacturing process to the surface of the curved member.
  • the manufacturing process of the image sensor 300 may be configured by applying a known semiconductor manufacturing process.
  • the distortion-free image formed by the lens group is formed on the curved surface as described above, when the image sensor 300 is configured in a curved shape so as to correspond to the curved surface in which the lens group is in focus, the image sensor 300 The image formed in the image is not distorted as compared with the actual image.
  • the lens group is formed to be bent in a three-dimensional form, which is a part of the rotating body with respect to the rotation axis 50, the area condensed on the lens group is widened to enable wide viewing angle photographing
  • the object 100 is reflected light by a light source such as sunlight or electric light.
  • Light reflected from the subject 100 passes through the lens group.
  • the lens group has the fisheye lens end face 22, the concave lens end face 32, the convex lens end face 42, and the image sensor end face 320 rotated relative to the rotation axis 50 in a predetermined angle range. Since the three-dimensional trajectory is obtained, an image passing through the lens group is formed on a curved surface. Since the image sensor 300 is disposed on a curved surface corresponding to the image of the lens group, an image formed through the lens group is formed in the image sensor 300 without being distorted. The image sensor 300 outputs the formed image signal as an electrical signal.
  • the electrical signal output from the image sensor 300 is converted into an image that can be viewed by a human in an image processing module and output to a monitor or a recording medium. That is, an essential feature of the present invention is that an image focused on by the lens group is formed on the curved surface, and the image sensor 300 is disposed at a position corresponding to the curved surface, thereby obtaining an image without distortion.
  • an advantage that can be implemented very easily necessary wide viewing angle imaging there is an advantage that can be implemented very easily necessary wide viewing angle imaging. Meanwhile, the lens group may implement 360 ° full range wide viewing angle imaging by processing the rotating body as shown in FIG. 5.
  • FIG. 6 is an exploded perspective view illustrating a three-dimensional structure of the lens configuring the lens group illustrated in FIG. 5.
  • FIG. 7 is a lens including only the fisheye lens 20 made of a three-dimensional trajectory obtained by rotating the fisheye lens cross section 22 around a rotation axis 50 in a predetermined angle range. That is, the fisheye lens 20 is a lens formed by a three-dimensional trajectory by rotating the fisheye lens section 22 in a predetermined angle range based on the rotation axis 50. That is, it presupposes the state in which the fish-eye lens end surface 22 was arrange
  • the fisheye lens 20 is a lens formed by a three-dimensional trajectory obtained by rotating the fisheye lens end surface 22 by a predetermined angle range about the rotation axis 50.
  • the concave lens 30 is a lens formed with a three-dimensional trajectory by rotating the concave lens end face 22 in a predetermined angle range with respect to the rotation axis 50.
  • the concave lens end face 32 is disposed on one plane.
  • a virtual rotation axis 50 spaced apart from the concave lens end surface 32 and perpendicular to the horizontal line is disposed in the horizontal direction passing through the center of the concave lens end face 32.
  • the concave lens 30 is a lens formed by a three-dimensional trajectory obtained by rotating the concave lens end surface 32 about a certain angle range about the rotation axis 50.
  • FIGS. 7 and 8 extract the fisheye lens end face 22 and the concave lens end face 32 of the lens end faces shown in FIG. 4, respectively, to center the rotation axis 50. It is a lens consisting of a three-dimensional trajectory obtained by rotating in a certain angle range.
  • the lens shown in FIGS. 7 and 8 may not constitute a camera device alone, but may play an important role in generating a wide viewing angle image without distortion.
  • the camera employing the wide viewing angle lens and the lens group according to the present invention is provided with a distortion-free image formed on a curved surface, and is provided with an image sensor corresponding to the curved surface, thereby providing an innovative wide viewing angle photographing effect.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
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Abstract

A wide-angle lens group according to the present invention is a group of wide-angle lenses for collecting light from a subject, wherein the lens group is formed along a three-dimensional trajectory which is obtained by sequentially arranging respective cross sections of a fisheye lens, a concave lens, and a convex lens on one plane, and rotating the cross sections of the fisheye lens, the concave lens, and the convex lens within a particular angle range with respect to a virtual rotation axis, which is perpendicular to a straight line connecting the centers of the cross sections of the fisheye lens, the concave lens, and the convex lens and disposed to be spaced from the cross section of the convex lens in a direction opposite to the cross section of the concave lens.

Description

[규칙 제26조에 의한 보정 02.03.2018]　광시야각 렌즈 및 렌즈군[Correction by rule 26.03.2018] Wide view angle lens and lens group
본 발명은 폐쇄회로 TV용 카메라(CCTV) 등에 적용될 수 있는 광 시야 각 렌즈 및 렌즈 군에 관한 것으로서, 왜곡 없는 광시야각 이미지를 얻는 데 기여하는 렌즈 및 렌즈군에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide viewing angle lens and a lens group applicable to a closed circuit television camera (CCTV) and the like, and to a lens and a lens group contributing to obtaining a wide viewing angle image without distortion.
일반적으로 카메라는 피사체에 반사된 빛을 렌즈를 통해 집광하여 특정한 위치에 이미지를 고정하는 장치다. 현재는 최초 카메라의 구조 중 필름이 디지털 이미지 센서로 대체된 디지털 카메라가 널리 사용되고 있다. 도 1을 참조하면 일반적인 디지털 카메라의 구조를 용이하게 이해할 수 있다. In general, a camera is a device for condensing light reflected from a subject through a lens to fix an image at a specific position. Currently, digital cameras, in which the film is replaced by a digital image sensor, are widely used in the structure of the first camera. Referring to Figure 1 it can be easily understood the structure of a general digital camera.
한편, 보안용으로 사용되는 폐쇄회로(Closed Circuit) TV용 카메라는 하나의 카메라를 이용하여 넓은 영역을 감시할 수 있는 것이 바람직하다. 이러한 목적을 달성하기 위해 감시용으로 사용하는 카메라는 어안렌즈와 같은 광각 렌즈를 채용할 수 있다. 그러나 어안 렌즈에 의한 이미지는 왜곡이 심한 문제점이 있다. 한편, 광시야각 촬영의 목적을 달성하기 위한 카메라 구조의 다른 일례가 대한민국 공개특허 제2013-0037883호에 개시되어 있다. On the other hand, it is preferable that a closed circuit TV camera used for security can monitor a large area using one camera. Cameras used for surveillance to achieve this purpose may employ wide-angle lenses, such as fisheye lenses. However, the image caused by the fisheye lens has a severe distortion problem. On the other hand, another example of a camera structure for achieving the object of the wide viewing angle is disclosed in Korean Patent Publication No. 2013-0037883.
상기 공개특허는 넓은 범위를 촬영할 수 있도록 카메라 렌즈에 반사구조를 이용하여 넓은 범위의 빛이 카메라 내로 집광 될 수 있는 구조를 채용하였다. 그런데 이와 같은 종래의 광시야각 카메라 구조는 넓은 범위를 촬영할 수 있는 장점이 있으나 치명적인 단점으로서 촬영되는 상이 왜곡되는 문제점이 있다. 따라서, 이와 같이 왜곡된 이미지를 보정 하기 위한 이미지처리 모듈이 추가되어야 하므로 구조적으로 복잡하며, 이미지처리 시간이 필요하므로 촬영시간과 최종 이미지출력 시간에 지연이 발생하는 문제점이 있다. 또한, 이미지 처리 모듈이 추가됨으로써 카메라 제조비용이 상승하는 단점이 있다. The Patent Publication employs a structure in which a wide range of light can be focused into the camera by using a reflective structure in the camera lens to capture a wide range. By the way, such a conventional wide-view angle camera structure has an advantage that can shoot a wide range, but as a fatal disadvantage, there is a problem that the image being photographed is distorted. Therefore, since an image processing module for correcting the distorted image needs to be added, it is structurally complicated, and since an image processing time is required, there is a problem that a delay occurs in the shooting time and the final image output time. In addition, the addition of the image processing module has the disadvantage that the camera manufacturing cost increases.
본 발명의 목적은 상술한 바와 같은 문제점을 해소하기 위해 인출된   The object of the present invention is to draw out to solve the above problems
것으로서, 광시야각 렌즈의 구조를 개선하여 그 렌즈를 통과하여 맺히는 이미지의To improve the structure of the wide viewing angle lens and
왜곡이 없으며 광시야각의 이미지를 얻는 데 기여할 수 있는 렌즈 및 렌즈 군을 제공하는 데 있다.It is to provide a lens and a group of lenses that are free from distortion and can contribute to obtaining a wide viewing angle image.
상기 목적을 달성하기 위해 본 발명의 일 실시 예에 따른 광시야각렌즈는, 피사체로부터 빛을 집광하는 광시야각 렌즈로서,  In order to achieve the above object, a wide viewing angle lens according to an embodiment of the present invention is a wide viewing angle lens for focusing light from a subject.
하나의 평면상에 어안 렌즈 단면이 배치되고, 상기 어안 렌즈 단면의 중심을 지나는 수평선에 수직이며 상기 어안 렌즈 단면으로부터 상기 수평선 방향으로 이격 되도록 배치된 가상의 회전축을 중심으로 상기 어안 렌즈 단면을 일정각도 범위에서 회전시켜 얻어지는 3차원 궤적으로 형성된 점에 특징이 있다. The fisheye lens cross section is disposed on one plane, and the fisheye lens cross section is angled about an imaginary rotation axis which is perpendicular to the horizontal line passing through the center of the fisheye lens cross section and spaced apart from the fisheye lens cross section in the horizontal direction. It is characterized by a point formed by a three-dimensional trajectory obtained by rotating in a range.
상기 목적을 달성하기 위해 본 발명의 다른 실시 예에 따른 광시야각 렌즈는, 하나의 평면상에 오목 렌즈 단면이 배치되고, 상기 오목 렌즈 단면, 상기 볼록 렌즈 단면의 중심을 지나는 수평선에 수직이며 상기 오목 렌즈 단면으로부터 상기 수평선 방향으로 이격 되도록 배치된 가상의 회전축을 중심으로 상기 오목 렌즈 단면을 일정 각도 범위에서 회전시켜 얻어지는 3차원 궤적으로 형성된 점에 특징이 있다. 상기 목적을 달성하기 위해 본 발명의 또 다른 실시 예에 따른 광시야각 렌즈군은, 피사체로부터 빛을 집광하는 광시야각 렌즈군으로서, In order to achieve the above object, a wide viewing angle lens according to another embodiment of the present invention has a concave lens end face disposed on one plane, and is perpendicular to a horizontal line passing through the center of the concave lens end face and the convex lens end face. It is characterized in that it is formed as a three-dimensional trajectory obtained by rotating the concave lens end face in a predetermined angle range about an imaginary rotational axis arranged to be spaced apart from the lens end face in the horizontal direction. In order to achieve the above object, a wide viewing angle lens group according to another embodiment of the present invention is a wide viewing angle lens group that condenses light from a subject.
하나의 평면상에 순차적으로 어안 렌즈 단면, 오목 렌즈 단면, 볼록렌즈 단면이 배치되고, 상기 어안 렌즈 단면, 상기 오목 렌즈 단면, 상기 볼록 렌즈 단면의 중심을 연결하는 직선에 수직이며 상기 볼록 렌즈 단면으로부터 상기 오목 렌즈 단면의 반대 방향으로 이격 되도록 배치된 가상의 회전축을 중심으로 상기 어안 렌즈 단면, 상기 오목 렌즈 단면, 상기 볼록 렌즈 단면을 일정 각도 범위에서 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈군인 점에 특징이 있다. A fisheye lens cross section, a concave lens cross section, and a convex lens cross section are sequentially arranged on one plane, and are perpendicular to a straight line connecting the centers of the fisheye lens cross section, the concave lens cross section, and the convex lens cross section, from the convex lens cross section. And a lens group formed by a three-dimensional trajectory obtained by rotating the fisheye lens cross section, the concave lens cross section, and the convex lens cross section around a virtual rotation axis arranged to be spaced apart in the opposite direction of the concave lens cross section within a predetermined angle range. There is this.
본 발명에 따른 광시야각 렌즈 및 렌즈 군은, 초점이 맞는 왜곡 없는 이미지가 곡면에 형성됨으로써 혁신적으로 광시야각 촬영이 가능한 카메라를 제조하는 데 크게 기여하는 효과를 제공한다. The wide viewing angle lens and the lens group according to the present invention provide an effect that greatly contributes to the manufacture of a camera capable of innovative wide viewing angle photography by forming a focused distortion-free image on a curved surface.
도 1은 일반적인 디지털 카메라의 원리를 보여주는 도면이다. 1 is a view showing the principle of a general digital camera.
도 2는 실린더 렌즈가 이미지를 형성하는 원리를 보여주는 도면이다.2 is a view showing the principle that the cylinder lens forms an image.
도 3은 본 발명에 따른 렌즈 군의 배치 구조를 보여주는 도면이다.3 is a view showing the arrangement of the lens group according to the present invention.
도 4는 도 3에 도시된 Ⅳ - Ⅳ 선 단면도이다.4 is a cross-sectional view taken along the line IV-IV shown in FIG.
도 5는 본 발명의 다른 실시 예에 따른 렌즈 군의 배치 구조를 보여주는 도면이다.5 is a view showing an arrangement structure of a lens group according to another embodiment of the present invention.
도 6은 도 5에 도시된 렌즈 군의 구성하는 렌즈의 입체적인 구조를 보여주는 분리 사시도이다.FIG. 6 is an exploded perspective view illustrating a three-dimensional structure of the lens of the lens group illustrated in FIG. 5.
도 7은 본 발명의 또 다른 실시 예에 따른 렌즈 구성을 보여주는 도면이다.7 is a view showing a lens configuration according to another embodiment of the present invention.
도 8은 본 발명의 또 다른 실시 예에 따른 렌즈 구성을 보여주는 도면이다.8 is a view showing a lens configuration according to another embodiment of the present invention.
이하, 본 발명에 따른 바람직한 실시 예를 첨부된 도면을 참조하면서 상세히 설명하기로 한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 3은 본 발명에 따른 렌즈 군의 배치 구조를 보여주는 도면이다. 도 4는 도 3에 도시된 Ⅳ - Ⅳ 선 단면도이다. 3 is a view showing the arrangement of the lens group according to the present invention. 4 is a cross-sectional view taken along the line IV-IV shown in FIG.
도 3 및 도 4를 참조하면, 본 발명의 일 실시 예에 따른 광시야각렌즈군(이하 "렌즈군"이라 한다.) 어안 렌즈(20)와, 오목 렌즈(30)와, 볼록렌즈(40)를 포함한다. 3 and 4, a wide viewing angle lens group (hereinafter referred to as a "lens group") according to an embodiment of the present invention, a fisheye lens 20, a concave lens 30, and a convex lens 40. It includes.
상기 렌즈 군은 피사체(100)로부터 반사되는 빛을 집광하는 역할을 한다. 본 발명의 렌즈 군(a group lens)을 구성하는 렌즈는 복수의 렌즈를 포함한다. 본 발명의 렌즈 군을 구성하는 렌즈는 막대 형상의 렌즈를 일정한 곡률로 휘어진 형태로 재가공한 형상이다. The lens group collects light reflected from the subject 100. The lens constituting the lens group of the present invention includes a plurality of lenses. The lens constituting the lens group of the present invention is a shape in which the rod-shaped lens is reworked in a curved shape with a constant curvature.
막대 형상의 렌즈의 일 예로서 실린더 렌즈가 있다. 일반적으로 실린더 렌즈는 X축과 Y축의 반지름이 서로 다른 유형의 렌즈이다. 실린더 렌즈(200)는 예컨대 도 2에 도시된 바와 같이 반 원통 형태로 구성될 수 있다. 한편, 실린더렌즈(200)는 원통형 형태로 제조될 수도 있다. 실린더 렌즈는 하나의 점을 기준으로 초점이 맞는 이미지를 형성하는 것이 아니라 하나의 선을 따라 초점이 맞는 이미지를 형성한다. 일반적으로 실린더 렌즈는 한 축 방향으로만 곡면이며, 다른 축 방향은 곡면이 아니기 때문에 한 축 방향으로만 빛이 집광 된다. 따라서, 도 2에 도시된 실린더 렌즈(200)는 Y축 방향으로 직선의 상을 형성한다. 피사체(100)에서 반사된 빛이 상기 실린더 렌즈를 통과하여 이미지 센서(300)에 상이 형성되는 원리는 도 2를 참조하여 용이하게 이해할 수 있다. 도 2를 참조하면 피사체(100)는 실린더 렌즈를 통과한 후 조리개(400)를 통과하여 이미지 센서(300)에 형성될 때 좌우 방향(X)으로는 대칭적으로 바뀐다. 한편, 실린더 렌즈를 통과한 피사체(100)가 이미지 센서(300)에 형성될 때 길이 방향(Y)으로는 대칭적으로 바뀌지 않는다. One example of a rod-shaped lens is a cylinder lens. In general, a cylinder lens is a type of lens having a different radius between the X and Y axes. The cylinder lens 200 may be configured in a semi-cylindrical form as shown in FIG. 2, for example. On the other hand, the cylinder lens 200 may be manufactured in a cylindrical shape. The cylinder lens does not form a focused image based on a single point, but forms a focused image along a line. In general, the cylinder lens is curved only in one axial direction, and light is focused only in one axial direction because the other axial direction is not curved. Therefore, the cylinder lens 200 shown in FIG. 2 forms a straight line image in the Y-axis direction. The principle that an image is formed in the image sensor 300 by the light reflected from the subject 100 passing through the cylinder lens can be easily understood with reference to FIG. 2. Referring to FIG. 2, the object 100 is symmetrically changed in the left and right directions X when it is formed in the image sensor 300 after passing through the cylinder lens and passing through the aperture 400. On the other hand, when the subject 100 passing through the cylinder lens is formed in the image sensor 300, it does not change symmetrically in the longitudinal direction Y.
본 발명에서는 이와 같은 막대 형상의 렌즈를 다시 한번 휘어진 형상으로 가공함으로써 X축 및 Y축 방향 모두 곡면으로 형성되도록 하여 종래의 렌즈에 비하여 현저하게 광시야각 이미지를 형성할 수 있는 렌즈를 제공한다. 또한, 본 발명에 따른 렌즈 군은 왜곡이 없는 이미지를 형성하므로 폐쇄회로 카메라(CCTV)와 같은 장치에 적용될 경우 이미지 보정을 위한 소프트웨어가 필요하지 않으므로 제조 비용이 절감되고 빠른 이미지 처리가 가능한 장점이 있다. The present invention provides a lens capable of forming a wider viewing angle image remarkably than a conventional lens by processing the rod-shaped lens once again into a curved shape so that both the X-axis and Y-axis directions are curved. In addition, since the lens group according to the present invention forms an image without distortion, when applied to a device such as a closed circuit camera (CCTV), software for image correction is not required, thus reducing manufacturing costs and enabling fast image processing. .
본 발명에서 상기 렌즈 군은 카메라의 원리상 바늘구멍에 대응하는 역할을 하는 구성요소이다. 특히, 통상적인 렌즈는 이미지를 하나의 초점에 형성하는 반면에, 본 발명에서 채용하는 상기 렌즈 군은 이미지를 곡선상에 형성하도록 구성한 점에 특징이 있다. 즉, 본 발명에서 상기 렌즈 군은 카메라 원리상 바늘구멍을 슬리(slit) 형태로 연장한 것과 같은 역할을 한다. 따라서, 상기 렌즈 군은 광시야각 이미지를 곡면상에 왜곡 없이 형성하는 작용을 한다. 즉, 상기 렌즈 군은 슬릿형태의 바늘구멍과 빛을 집약하는 렌즈 고유의 역할을 동시에 수행한다. In the present invention, the lens group is a component that plays a role corresponding to the needle hole in principle of the camera. In particular, conventional lenses form an image at one focal point, whereas the lens group employed in the present invention is characterized in that it is configured to form an image on a curve. That is, in the present invention, the lens group plays a role of extending the needle hole in a slit form on the principle of the camera. Therefore, the lens group functions to form a wide viewing angle image on the curved surface without distortion. That is, the lens group simultaneously performs a unique role of a lens that concentrates light and a slit-shaped needle hole.
더 구체적으로 상기 어안 렌즈(20)와, 상기 오목 렌즈(30)와, 상기 볼록 렌즈(40)는 가상의 회전축(50)을 기준으로 어안 렌즈 단면(22), 오목 렌즈 단면(32), 볼록 렌즈 단면(42)이 일정한 각도 범위에서 회전되어 3차원 궤적으로 형성된 렌즈이다. 즉, 도 4에 도시된 바와 같이 하나의 평면상에 상기 어안 렌즈 단면(22), 상기 오목 렌즈 단면(32), 상기 볼록 렌즈 단면(42)이 배치된 상태를 전제한다. 그리고 상기 볼록 렌즈 단면(42)으로부터 상기 오목 렌즈 단면(32)의 반대 방향으로 이격 되도록 배치된 가상의 회전축(50)이 배치된 상태를 전제한다. 상기회전축(50)은 상기 어안 렌즈 단면(22), 상기 오목 렌즈 단면(32), 상기 볼록 렌즈 단면(42)의 중심을 연결하는 직선에 수직인 가상의 축이다. 상기 어안 렌즈(20)는 상기 회전축(50)을 중심으로 상기 어안 렌즈 단면(22)을 일정 각도 범위만큼 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈다. 한편, 상기 오목 렌즈(30)는 상기 회전축(50)을 중심으로 상기 오목 렌즈 단면(32)을 일정 각도 범위만큼 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈다. 그리고 상기 볼록 렌즈(40)는 상기 회전축(50)을 중심으로 상기 볼록 렌즈 단면(42)을 일정 각도 범위만큼 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈다. 예컨대 도 3은 도 4에 도시된 렌즈 단면을 상기 회전축(50)을 기준으로 180° 범위에서 회전시켜 얻은 3차원 궤적으로 형성된 렌즈 군의 배치 구조를 보여준다. 상기 어안 렌즈(20), 상기 오목 렌즈(30), 상기 볼록 렌즈(40)는 하나의 프레임 또는 경통(미 도시)에 의해 하나의 렌즈 장치로 결합 될 수 있다. 상기 렌즈 군에 의해 얻어지는 이미지는 곡면상에 형성됨으로써 왜곡되지 않는 이미지가 형성된다. 따라서 상기 렌즈 군을 채용한 카메라를 제조하는 경우에는 이미지 센서(300)도 곡면 형태로 구성하여야 한다. 상기 이미지센서 (300)는 상기 렌즈 군에 의해 형성된 이미지를 전기 신호로 출력한다. 상기 이미지센서(300)의 전기 신호는 전류 또는 전압이 될 수 있다. 상기 이미지 센서(300)로는 CCD 센서 또는 CMOS 센서가 채용될 수 있다. 상기 이미지 센서(300)는 상기 렌즈 군의 초점 거리에 대응하도록 곡면으로 형성된다. 상기 이미지 센서(300)는 미세한 크기의 이미지 센서를 곡면 형상의 부재 위에 부착하여 형성할 수 있다. 한편, 상기 이미지 센서(300)는 곡면 부재의 표면에 연속적인 반도체 제조 공정을 적용하여 CCD 또는 CMOS 회로를 직접 적층 형성할 수도 있다. 상기 이미지 센서(300)의 제조 공정은 공지된 반도체 제조 공정을 적용하여 구성할 수 있다. More specifically, the fisheye lens 20, the concave lens 30, and the convex lens 40 may have a fisheye lens cross-section 22, a concave lens cross-section 32, and a convex on the basis of the virtual rotation axis 50. The lens cross section 42 is a lens formed by rotating in a predetermined angle range as a three-dimensional trajectory. That is, it is assumed that the fisheye lens end face 22, the concave lens end face 32, and the convex lens end face 42 are disposed on one plane as shown in FIG. In addition, it is assumed that a virtual rotary shaft 50 is disposed to be spaced apart from the convex lens end face 42 in the opposite direction to the concave lens end face 32. The rotation axis 50 is an imaginary axis perpendicular to a straight line connecting the centers of the fisheye lens end face 22, the concave lens end face 32, and the convex lens end face 42. The fisheye lens 20 is a lens formed with a three-dimensional trajectory obtained by rotating the fisheye lens end surface 22 by a predetermined angle with respect to the rotation axis 50. On the other hand, the concave lens 30 is a lens formed by a three-dimensional trajectory obtained by rotating the concave lens end face 32 about a certain angle range about the rotation axis 50. The convex lens 40 is a lens formed by a three-dimensional trajectory obtained by rotating the convex lens end face 42 about a predetermined angle range about the rotation axis 50. For example, FIG. 3 shows an arrangement structure of a lens group formed by a three-dimensional trajectory obtained by rotating the lens cross section shown in FIG. 4 in a range of 180 ° with respect to the rotation axis 50. The fisheye lens 20, the concave lens 30, and the convex lens 40 may be combined into one lens device by one frame or barrel (not shown). The image obtained by the lens group is formed on a curved surface to form an image that is not distorted. Therefore, when manufacturing a camera employing the lens group, the image sensor 300 should also be configured in a curved form. The image sensor 300 outputs an image formed by the lens group as an electrical signal. The electrical signal of the image sensor 300 may be a current or a voltage. As the image sensor 300, a CCD sensor or a CMOS sensor may be employed. The image sensor 300 is formed in a curved surface to correspond to the focal length of the lens group. The image sensor 300 may be formed by attaching an image sensor having a fine size on a curved member. Meanwhile, the image sensor 300 may directly form a CCD or CMOS circuit by applying a continuous semiconductor manufacturing process to the surface of the curved member. The manufacturing process of the image sensor 300 may be configured by applying a known semiconductor manufacturing process.
이와 같이 상기 렌즈 군에 의해 형성되는 왜곡 없는 이미지가 곡면상에 형성되므로, 상기 이미지 센서(300)가 상기 렌즈 군의 초점이 맞는 곡면에 대응하도록 곡면 형태로 구성될 경우, 상기 이미지 센서(300)에 형성되는 이미지가 실제 이미지에 비하여 왜곡되지 않게 된다. 또한, 상기 렌즈 군이 상기 회전축(50)을 기준으로 회전체의 일부분인 3차원 형태로 휘어지도록 형성됨으로써 상기 렌즈 군에 집광 되는 영역이 넓어져서 광시야각 촬영이 가능하다 Since the distortion-free image formed by the lens group is formed on the curved surface as described above, when the image sensor 300 is configured in a curved shape so as to correspond to the curved surface in which the lens group is in focus, the image sensor 300 The image formed in the image is not distorted as compared with the actual image. In addition, the lens group is formed to be bent in a three-dimensional form, which is a part of the rotating body with respect to the rotation axis 50, the area condensed on the lens group is widened to enable wide viewing angle photographing
이하에서는 상술한 바와 같은 구성요소를 포함한 광시야각 렌즈군 이 채용된 광시야각 카메라의 작용 효과를 예로 들어 본 발명에 따른 렌즈 군의 작용 효과를 상세하게 서술하기로 한다. Hereinafter, the effect of the lens group according to the present invention will be described in detail by taking the effect of the wide-angle camera including the components described above as an example.
먼저, 피사체(100)는 태양광이나 전등과 같은 광원에 의해 빛이 반사된다. 피사체(100)에서 반사된 빛은 상기 렌즈 군을 통과한다. 상기 렌즈 군은 상기 회전축(50)을 기준으로 상기 어안 렌즈 단면(22), 상기 오목 렌즈 단면(32), 상기 볼록 렌즈 단면(42) 및 상기 이미지 센서 단면(320)이 일정 각도 범위에서 회전되어 얻어지는 3차원 궤적으로 이루어지므로 상기 렌즈 군을 통과한 이미지가 곡면상에 형성된다. 상기 렌즈 군의 이미지에 대응한 곡면에 상기 이미지 센서(300)가 배치되어 있으므로 상기 렌즈 군을 통과하여 형성된 이미지는 왜곡되지 않고 상기이미지 센서(300)에 형성된다. 상기 이미지 센서(300)는 형성된 이미지 신호를 전기 신호로 출력하게 된다. 상기 이미지 센서(300)에서 출력된 전기 신호는 이미지처리 모듈에서 사람이 볼 수 있는 이미지 형태로 변환되어 모니터나 기록 매체에 출력된다. 즉, 본 발명의 본질적인 특징은 상기 렌즈 군에 의해 초점이 맞는 이미지가 곡면상에 형성되며 그 곡면에 대응하는 위치에 이미지 센서(300)가 배치됨으로써 왜곡 없는 이미지를 얻을 수 있다. 또한, 상기 렌즈 군을 회전체의 일부분으로 가공함으로써 필요한 광시야각 촬영을 매우 용이하게 구현할 수 있는 장점이 있다. 한편, 상기 렌즈 군은 도 5에 도시된 바와 같이 회전체로 가공함으로써 360° 전 범위 광시야각 촬영을 구현할 수 있다. 도 6은 도 5에 도시된 렌즈 군을 구성하는 렌즈의 입체적인 구조를 보여주는 분리 사시도이다. First, the object 100 is reflected light by a light source such as sunlight or electric light. Light reflected from the subject 100 passes through the lens group. The lens group has the fisheye lens end face 22, the concave lens end face 32, the convex lens end face 42, and the image sensor end face 320 rotated relative to the rotation axis 50 in a predetermined angle range. Since the three-dimensional trajectory is obtained, an image passing through the lens group is formed on a curved surface. Since the image sensor 300 is disposed on a curved surface corresponding to the image of the lens group, an image formed through the lens group is formed in the image sensor 300 without being distorted. The image sensor 300 outputs the formed image signal as an electrical signal. The electrical signal output from the image sensor 300 is converted into an image that can be viewed by a human in an image processing module and output to a monitor or a recording medium. That is, an essential feature of the present invention is that an image focused on by the lens group is formed on the curved surface, and the image sensor 300 is disposed at a position corresponding to the curved surface, thereby obtaining an image without distortion. In addition, by processing the lens group as a part of the rotating body there is an advantage that can be implemented very easily necessary wide viewing angle imaging. Meanwhile, the lens group may implement 360 ° full range wide viewing angle imaging by processing the rotating body as shown in FIG. 5. FIG. 6 is an exploded perspective view illustrating a three-dimensional structure of the lens configuring the lens group illustrated in FIG. 5.
한편, 도 7과 도 8은 각각 본 발명의 또 다른 실시 예에 따른 렌즈구성을 보여주는 도면이다. 도 7은 회전축(50)을 중심으로 어안 렌즈 단면(22)을 일정 각도 범위에서 회전시켜 얻어지는 3차원 궤적으로 이루어진 어안 렌즈(20)만을 포함하는 렌즈이다. 즉, 상기 어안 렌즈(20)는 회전축(50)을 기준으로 어안 렌즈 단면(22)이 일정한 각도 범위에서 회전되어 3차원 궤적으로 형성된 렌즈이다. 즉, 하나의 평면상에 상기 어안 렌즈 단면(22)이 배치된 상태를 전제한다. 그리고 상기 어안 렌즈 단면(22)의 중심을 지나는 수평선 방향으로 상기 어안렌즈 단면(22)으로부터 이격 되며 상기 수평선에 수직인 가상의 회전축(50)이 배치된 상태를 전제한다. 상기 어안 렌즈(20)는 상기 회전축(50)을 중심으로 상기 어안 렌즈 단면 (22) 을 일정 각도 범위만큼 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈다. On the other hand, Figure 7 and Figure 8 is a view showing a lens configuration according to another embodiment of the present invention, respectively. FIG. 7 is a lens including only the fisheye lens 20 made of a three-dimensional trajectory obtained by rotating the fisheye lens cross section 22 around a rotation axis 50 in a predetermined angle range. That is, the fisheye lens 20 is a lens formed by a three-dimensional trajectory by rotating the fisheye lens section 22 in a predetermined angle range based on the rotation axis 50. That is, it presupposes the state in which the fish-eye lens end surface 22 was arrange | positioned on one plane. In addition, it is assumed that a virtual rotation axis 50 spaced apart from the fisheye lens end surface 22 and perpendicular to the horizontal line is disposed in the horizontal direction passing through the center of the fisheye lens end surface 22. The fisheye lens 20 is a lens formed by a three-dimensional trajectory obtained by rotating the fisheye lens end surface 22 by a predetermined angle range about the rotation axis 50.
한편, 도 8은 회전축(50)을 중심으로 오목 렌즈 단면(32)을 일정 각도 범위에서 회전시켜 얻어지는 3차원 궤적으로 이루어진 오목 렌즈(30)만을 포함하는 렌즈이다. 즉, 상기 오목 렌즈(30)는 회전축(50)을 기준으로 오목 렌즈 단면 (22) 이 일정한 각도 범위에서 회전되어 3차원 궤적으로 형성된 렌즈이다. 즉, 하나의 평면상에 상기 오목 렌즈 단면(32)이 배치된 상태를 전제한다. 그리고 상기 오목 렌즈 단면(32)의 중심을 지나는 수평선 방향으로 상기 오목 렌즈 단면(32)으로부터 이격 되며 상기 수평선에 수직인 가상의 회전축(50)이 배치된 상태를 전제한다. 상기 오목 렌즈(30)는 상기 회전축(50)을 중심으로 상기 오목 렌즈 단면(32)을 일정 각도 범위만큼 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈다. 8 is a lens including only the concave lens 30 made of a three-dimensional trajectory obtained by rotating the concave lens end face 32 around a rotation axis 50 in a predetermined angle range. That is, the concave lens 30 is a lens formed with a three-dimensional trajectory by rotating the concave lens end face 22 in a predetermined angle range with respect to the rotation axis 50. In other words, it is assumed that the concave lens end face 32 is disposed on one plane. In addition, it is assumed that a virtual rotation axis 50 spaced apart from the concave lens end surface 32 and perpendicular to the horizontal line is disposed in the horizontal direction passing through the center of the concave lens end face 32. The concave lens 30 is a lens formed by a three-dimensional trajectory obtained by rotating the concave lens end surface 32 about a certain angle range about the rotation axis 50.
도 7 및 도 8에 도시된 회전체의 일부 형상으로 구성된 렌즈는 도 4에 도시된 렌즈 단면들 중 각각 어안 렌즈 단면(22)과 오목 렌즈 단면(32)을 추출하여 상기 회전축(50)을 중심으로 일정 각도 범위에서 회전시켜 얻은 3차원 궤적으로 이루어진 렌즈이다. 도 7 및 도 8에 도시된 렌즈는 단독으로 카메라 장치를 구성할 수 없으나 왜곡 없는 광시야각 이미지 생성에 중요한 역할을 수행할 수 있다. 7 and 8 extract the fisheye lens end face 22 and the concave lens end face 32 of the lens end faces shown in FIG. 4, respectively, to center the rotation axis 50. It is a lens consisting of a three-dimensional trajectory obtained by rotating in a certain angle range. The lens shown in FIGS. 7 and 8 may not constitute a camera device alone, but may play an important role in generating a wide viewing angle image without distortion.
이와 같이 본 발명에 따른 광시야각 렌즈 및 렌즈 군을 채용한 카메라는 왜곡 없는 이미지가 곡면에 형성되며, 그 곡면에 대응하는 이미지 센서가 구비됨으로써 혁신적으로 광시야각 촬영이 가능한 효과를 제공한다. As described above, the camera employing the wide viewing angle lens and the lens group according to the present invention is provided with a distortion-free image formed on a curved surface, and is provided with an image sensor corresponding to the curved surface, thereby providing an innovative wide viewing angle photographing effect.
이상, 바람직한 실시 예를 본 발명에 대해 설명하였으나, 본 발명이 그러한 예에 의해 한정되는 것은 아니며, 본 발명의 기술적 사상을 벗어나지 않는 범주 내에서 다양한 형태의 실시 예가 구체화될 수 있을 것이다. As mentioned above, although preferred embodiment was described about this invention, this invention is not limited by the said example, Various forms of embodiment can be actualized in the range which does not deviate from the technical idea of this invention.

Claims (3)

  1. 피사체로부터 빛을 집광하는 광시야각 렌즈로서, 하나의 평면상에 어안 렌즈 단면이 배치되고, 상기 어안 렌즈 단면의 중심을 지나는 수평선에 수직이며 상기 어안 렌즈 단면으로부터 상기 수평선 방향으로 이격 되도록 배치된 가상의 회전축을 중심으로 상기 어안 렌즈 단면을 일정 각도 범위에서 회전시켜 얻어지는 3차원 궤적 으로 형성된 렌즈인 것을 특징으로 하는 광시야각 렌즈.  A wide viewing angle lens for condensing light from a subject, wherein a fish-eye lens cross section is disposed on one plane, and a virtual lens is disposed so as to be perpendicular to a horizontal line passing through the center of the fish-eye lens cross section and spaced apart from the fish-eye lens cross section in the horizontal direction. A wide viewing angle lens, characterized in that the lens is formed by a three-dimensional trajectory obtained by rotating the fisheye lens section in a predetermined angle range about a rotation axis.
  2. 하나의 평면상에 오목 렌즈 단면이 배치되고, 상기 오목 렌즈 단면의 중심을 지나는 수평선에 수직이며, 상기 오목 렌즈 단면으로부터 상 기 수평선 방향으로 이격 되도록 배치된 가상의 회전축을 중심으로 상기 오목 렌즈 단면을 일정 각도 범위에서 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈인 것을 특징으로 하는 광시야각 렌즈.  The concave lens cross section is disposed on one plane, and the concave lens cross section is centered on an imaginary rotation axis which is perpendicular to a horizontal line passing through the center of the concave lens cross section and spaced apart from the concave lens cross section in the horizontal direction. A wide viewing angle lens, characterized in that the lens formed by a three-dimensional trajectory obtained by rotating in a predetermined angle range.
  3. 피사체로부터 빛을 집광하는 광시야각 렌즈 군으로서, 하나의 평면상에 순차적으로 어안 렌즈 단면, 오목 렌즈 단면, 볼록 렌즈 단면이 배치되고, 상기 어안 렌즈 단면, 상기 오목 렌즈 단면, 상기 볼록 렌즈 단면의 중심을 연결하는 직선에 수직이며 상기 볼록 렌즈 단면으로부터 상기 오목 렌즈 단면의 반대 방향으로 되도록 배치된 가상의 회전축을 중심으로 상기 어안 렌즈 단면, 상기 오목 렌즈 단면, 상기 볼록 렌즈 단면을 일정 각도 범위 에서 회전시켜 얻어지는 3차원 궤적으로 형성된 렌즈인 것을 특징으로 하는 광시야각 렌즈군. A wide viewing angle lens group for condensing light from a subject, wherein a fish-eye lens cross section, a concave lens cross section, and a convex lens cross section are sequentially arranged on one plane, and a center of the fish-eye lens cross section, the concave lens cross section, and the convex lens cross section is provided. The fisheye lens cross section, the concave lens cross section, and the convex lens cross section are rotated in a predetermined angle range about an imaginary rotation axis which is perpendicular to a straight line connecting the convex lens cross section from the convex lens cross section. A wide viewing angle lens group, which is a lens formed by a three-dimensional trajectory obtained.
PCT/KR2017/010222 2016-10-12 2017-09-19 Wide-angle lens and wide-angle lens group WO2018070680A1 (en)

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