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WO2018056683A1 - Caméra infrarouge à grande longueur d'onde et objectif à angle de champ horizontal de 54 degrés - Google Patents

Caméra infrarouge à grande longueur d'onde et objectif à angle de champ horizontal de 54 degrés Download PDF

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Publication number
WO2018056683A1
WO2018056683A1 PCT/KR2017/010286 KR2017010286W WO2018056683A1 WO 2018056683 A1 WO2018056683 A1 WO 2018056683A1 KR 2017010286 W KR2017010286 W KR 2017010286W WO 2018056683 A1 WO2018056683 A1 WO 2018056683A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
convex surface
concave surface
view
horizontal angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2017/010286
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English (en)
Korean (ko)
Inventor
신승철
정석현
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Somo Energy And Technology Co ltd
Original Assignee
Somo Energy And Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Somo Energy And Technology Co ltd filed Critical Somo Energy And Technology Co ltd
Publication of WO2018056683A1 publication Critical patent/WO2018056683A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
    • G01J5/0025—Living bodies
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • 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
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0025—Machining, e.g. grinding, polishing, diamond turning, manufacturing of mould parts
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • the present invention relates to a long-wavelength infrared camera and a lens for a camera having a horizontal angle of view of 54 degrees, and more particularly, to a long-wavelength infrared (aka "LWIR”) camera and a lens for a camera that can be used in various fields including fire surveillance.
  • LWIR long-wavelength infrared
  • the long wavelength infrared rays are light in the wavelength range of 8 ⁇ m to 12 ⁇ m and include the wavelength range of the infrared rays emitted by humans.
  • the long wavelength infrared camera is a camera that can detect and capture infrared rays generated by humans or animals at night.
  • the body temperature of humans and animals is about 310K, and the peak wavelength at 310K of black body radiation is about 8 ⁇ m to 12 ⁇ m.
  • the conventional infrared camera is made mainly of direct-processing lenses based on germanium (Germanium) lens, the manufacturing cost is high and the manufacturing time was also long.
  • the germanium lens is mainly applied to the military field, and in the civil field, its use is insignificant due to the price problem.
  • the present invention has been made to solve the above problems of the prior art, the object of the present invention can be applied to the mold molding optical material to lower the production cost compared to the existing germanium lens and to be easily applied to the civil field through mass production
  • the present invention provides a long wavelength infrared camera having a horizontal angle of view of 54 degrees and a lens for a camera.
  • the object of the present invention is a high-wavelength infrared camera with a horizontal angle of view 54 degrees high refractive index and lens transmission characteristics compared to the conventional germanium optical devices, and can be configured for a variety of optical systems from ultra-small diameter to medium-caliber lens and can be applied to fire monitoring And a lens for a camera.
  • a lens for a long wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention
  • a concave surface R2 that primarily refracts light incident from a subject
  • k is the conic surface coefficient
  • A4, A6, A8 and A10 are aspherical coefficients
  • h is the distance from the optical axis to the concave or convex surface and c represents the center curvature
  • the radius of curvature and the thickness have an allowable range of ⁇ 0.5%
  • Diameter of concave surface R2 / (diameter of convex surface R3) is characterized in that 0.46 (acceptable range of ⁇ 0.5%).
  • the lens is characterized in that the edge portion extending between the concave surface (R2) and the convex surface (R3) in the direction perpendicular to the optical axis is formed.
  • the lens is a lens
  • the distance between the aperture and the concave surface (R2) is 0.36mm ⁇ 0.5%
  • the central thickness (TC) of the concave surface (R2) and convex surface (R3) is 3.305mm ⁇ 0.5%, from the convex surface (R3)
  • the distance to the infrared filter is 2.0mm ⁇ 0.5%
  • the thickness of the infrared filter is 0.65mm ⁇ 0.5%
  • the distance from the infrared filter to the sensor surface is 1.3mm ⁇ 0.5%
  • the refractive index of the filter is 3.421
  • the dispersion ratio is 2421.0. It features.
  • a single lens can be used to detect a living thing or object, inside or outside a building, inside a specific equipment (such as a transformer), or narrow.
  • the advantage is that it can be applied to space.
  • the present invention it is made of a structure capable of molding by molding, there is an advantage that the production is easy, mass production is possible, and the manufacturing unit cost is low.
  • FIG. 1 is a perspective view of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • FIG. 2 is a configuration diagram illustrating the optical system structure of FIG. 2.
  • FIG. 3 is a light tracking analysis diagram of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • FIG. 4 is a graph showing longitudinal spherical aberration of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • 5 is an aberration analysis graph of astigmatism of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • FIG. 6 is a graph illustrating distortion of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • FIG. 7 is a graph illustrating an analysis of a Modulation Transfer Function (MTF) indicating a resolution of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • MTF Modulation Transfer Function
  • FIG. 8 is a diagram illustrating a spot diagram of a long wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • the long-wavelength infrared camera 1000 having a horizontal angle of view of 54 degrees includes an aperture 100, a concave surface R2 for primarily refracting light incident from a subject, and A lens 200 including a convex surface R3 for secondarily refracting the light passing through the concave surface R2, an infrared filter 300 spaced apart from the convex surface R3, and the infrared filter And a sensor surface 400 that forms an object through light passing through the 300.
  • the diaphragm 100 disposed in front of the convex surface R3 performs a function of preventing light from entering the optical system of the present invention.
  • the lens 200 having a horizontal angle of view of 54 degrees is formed of an optical material for molding a mold.
  • the optical material for molding the mold is made of glass or plastic, and adopts materials that can be composed of various optical systems from ultra-small diameter lenses to medium-diameter lenses by using those having higher refractive index and lens transmission characteristics than similar types of materials on the market. Good to do.
  • a material having a refractive index of 2.5 or more and a transmittance of 65% or more up to a wavelength band of 12 ⁇ m may be used as a material for molding.
  • the optical system is composed of the optical material according to the present invention, it is possible to realize a clear image compared to the existing, and it is possible to form a molding by molding, it is possible to construct a security surveillance popular LWIR camera optical system is easy to manufacture and low manufacturing cost.
  • the long-wavelength infrared camera 1000 having a horizontal angle of view of 54 degrees proceeded with an optical design of a low-cost type LWIR 1 group applying 6400 pixels (sensor).
  • the optical system of the present invention has a form advantageous for mold molding by increasing the thickness of the lens center portion and the edge portion 210.
  • the present invention is a camera optical system for fire surveillance LWIR, formed by molding and made of concave surface (R2) facing the object and convex surface (R3) opposite, and has a positive refractive index as a whole, both sides are aspherical. .
  • the concave surface R2 and the convex surface R3 of the lens 200 according to the present invention are defined by the following ⁇ Equation 1>.
  • k is a conical surface coefficient
  • A4, A6, A8 and A10 are aspherical coefficients
  • h is a distance from an optical axis to a concave or convex surface
  • c represents a center curvature
  • the aspherical surface coefficient is defined to define the concave surface R2 and the convex surface R3.
  • the curvature radius RC and the surface thickness ST of the concave surface R2 and the convex surface R3 of the lens 200 were set, and the refractive index n and the dispersion rate v1 were set. ).
  • the dispersion ratio v1 is defined by the following equation.
  • N110 is a refractive index at a wavelength of 10 ⁇ m of a single lens
  • n108 is a refractive index at a wavelength of 8.0 ⁇ m of a single lens
  • n112 is a refractive index at a wavelength of 12 ⁇ m of a single lens
  • the radius of curvature and the surface thickness may have an allowable range of ⁇ 0.5%.
  • the average value of the center thickness TC / diameter of the concave surface R2 and the convex surface R3 is 0.86 (acceptable range of ⁇ 0.5%)
  • (thickness of the edge portion of the lens) / (the concave surface ( R2) and the central thickness TC of the convex surface R3) have a value of 0.60 (acceptable range of ⁇ 0.5%), so that an angle of view of 54 degrees can be accurately matched.
  • the thickness of the lens center portion and the edge portion is thick, an advantageous form for mold molding is possible.
  • the distance between the aperture and the concave surface (R2) is 0.36mm ⁇ 0.5%
  • the central thickness (TC) of the concave surface (R2) and the convex surface (R3) is 3.305mm ⁇ 0.5%
  • the convex The distance from the surface R3 to the infrared filter is 2.0 mm ⁇ 0.5%
  • the thickness of the infrared filter is 0.65 mm ⁇ 0.5%
  • the distance from the infrared filter to the sensor surface may be set to 1.3 mm ⁇ 0.5%.
  • the lens 200 may be manufactured within the tolerance of the manufactured lens, thereby manufacturing a lens having a constant optical performance.
  • the corner portion of the lens 200 in a round shape, it can be advantageous to the assembly and production of the optical system.
  • the refractive index of the infrared filter 300 is 3.421 and the dispersion rate is 2421.0.
  • a predetermined angle of view can be obtained, and at the same time, longitudinal spherical aberration, astigmatism, and distortion can be minimized, and a good state can be obtained at a value of MTF (Modulation Transfer Functions) representing resolution.
  • MTF Modulation Transfer Functions
  • An exemplary embodiment of a long wavelength infrared camera 1000 having a horizontal angle of view of 54 degrees according to the present invention is described based on the configuration as described above.
  • the long-wavelength infrared camera 54-degree horizontal view angle is a camera optical system for LWIR that can be applied to the fire monitoring, Ge 27 .5 13 .5 -Sb mold by applying a non-oxide infrared optical glass consisting of 60 -Se Molding was performed.
  • the curvature radii of the concave surface R2 and the convex surface R3 of the lens 200 are -7.0622 mm (aspherical surface), -3.4640 mm (aspherical surface), and the diameter of the concave surface R2 is 2.42 mm and convex, respectively.
  • the diameter of the surface R3 was set to 5.24 mm.
  • the thickness of the entire lens 200 was formed to 3.64mm.
  • an edge portion 210 extending from the concave surface R2 and the convex surface R3 is formed perpendicular to the optical axis.
  • the diameter of the entire lens is set to 7.50 mm.
  • the length of the edge portion 210 can be appropriately adjusted.
  • the edge portion of the edge portion 210 is treated with a round of 0.3 ⁇ 0.6mm.
  • the concave surface R2 and the convex surface R3 of the lens 200 were formed from the above ⁇ Formula 1>, ⁇ Table 1> and ⁇ Table 2>.
  • the center part thickness TC of the concave surface R2 and the convex surface R3 was set to 3.305 mm, and the thickness of the edge part of a lens was set to 1.97, respectively.
  • the distance between the aperture 100 and the concave surface (R2) is 0.36mm
  • the distance from the convex surface (R3) to the infrared filter 300 is 2.0mm
  • the thickness of the infrared filter 300 is 0.65mm
  • the The distance from the infrared filter 300 to the sensor surface 400 was set to 1.3 mm.
  • the infrared filter 300 has a refractive index of 3.421 and a dispersion of 2421.0.
  • a sensor of the sensor surface 400 may be a 34 ⁇ m sensor of 80 * 80 pixels.
  • FIG. 3 is an optical trace analysis diagram of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention
  • FIG. 4 is a graph showing longitudinal spherical abberration of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention
  • 5 is an aberration analysis graph of astigmatism of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention
  • FIG. 6 is a graph showing distortion of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention.
  • FIG. 7 is a graph analyzing a Modulation Transfer Function (MTF) indicating the resolution of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention
  • FIG. 8 is a spot diagram of a long-wavelength infrared camera having a horizontal angle of view of 54 degrees according to the present invention. diagram).
  • MTF Modulation Transfer Function
  • the long-wavelength infrared camera having a horizontal angle of view of 54 degrees shows that the values of the images are shown adjacent to the central axis in almost all fields, indicating that the correction state of various aberrations is good.
  • the MTF optical required performance / resolution
  • the lens material of the present invention has a high refractive index and a high transmittance of 65% or more up to a wavelength band of 12 ⁇ m as a material for molding a mold that is applied to the existing market.
  • the optical system of the present invention has an advantageous shape for molding by thickening the lens center and the edge portion.
  • the performance of the optical system is secured at an ambient light ratio of 84% or more and a distortion ratio of 20% or less.
  • the present invention is sufficiently possible to apply an optical material for molding a mold such as a non-oxide infrared optical glass, it is possible to lower the production cost compared to the conventional germanium lens and easily applied to the civilian field through mass production.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

La présente invention concerne une caméra infrarouge à grande longueur d'onde et un objectif à angle de champ horizontal de 54 degrés, l'objectif à angle de champ horizontal de 54 degrés étant constitué d'un matériau optique pouvant être moulé et comportant une surface concave (R2) servant à une déviation primaire de la lumière entrante provenant d'un sujet, et une surface convexe (R3) servant à une déviation secondaire de la lumière qui a traversé la surface concave (R2), la surface concave (R2) et la surface convexe (R3) étant définies par les relations de la formule 1, du tableau 1 et du tableau 2 de la description détaillée.
PCT/KR2017/010286 2016-09-20 2017-09-20 Caméra infrarouge à grande longueur d'onde et objectif à angle de champ horizontal de 54 degrés Ceased WO2018056683A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020160120194A KR101768575B1 (ko) 2016-09-20 2016-09-20 수평화각 54도의 장파장 적외선 카메라 및 카메라용 렌즈
KR10-2016-0120194 2016-09-20

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WO2018056683A1 true WO2018056683A1 (fr) 2018-03-29

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KR (1) KR101768575B1 (fr)
CN (1) CN107843975A (fr)
HK (1) HK1246864A1 (fr)
TW (1) TWI663441B (fr)
WO (1) WO2018056683A1 (fr)

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Publication number Priority date Publication date Assignee Title
KR102134298B1 (ko) * 2019-01-17 2020-07-16 주식회사 소모아이알 수평화각 120도의 장파장 적외선 카메라 및 카메라용 렌즈
KR102299461B1 (ko) * 2020-01-10 2021-09-07 한국광기술원 이미지 영상 영역별 균일한 해상도를 갖는 화각 40도급 원적외선 광학계

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JP5227780B2 (ja) * 2008-12-24 2013-07-03 カンタツ株式会社 撮像レンズ
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KR20050110604A (ko) * 2005-11-08 2005-11-23 샤닝포터 주식회사 비구면을 이용한 광각 카메라용 광학계
JP2010249931A (ja) * 2009-04-13 2010-11-04 Fujifilm Corp 赤外線用レンズおよび撮像装置
JP2013235183A (ja) * 2012-05-10 2013-11-21 Canon Inc 光学系及びそれを有する撮像装置
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CN107843975A (zh) 2018-03-27
TWI663441B (zh) 2019-06-21
TW201823787A (zh) 2018-07-01
HK1246864A1 (zh) 2018-09-14
KR101768575B1 (ko) 2017-08-17

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