TWI625969B - Long-wavelength infrared camera with 90 degree angle of view and lens for the camera - Google Patents
Long-wavelength infrared camera with 90 degree angle of view and lens for the camera Download PDFInfo
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- TWI625969B TWI625969B TW106132265A TW106132265A TWI625969B TW I625969 B TWI625969 B TW I625969B TW 106132265 A TW106132265 A TW 106132265A TW 106132265 A TW106132265 A TW 106132265A TW I625969 B TWI625969 B TW I625969B
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- 230000003287 optical effect Effects 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000004075 alteration Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 5
- 241001465754 Metazoa Species 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 3
- 229910052724 xenon Inorganic materials 0.000 description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000005304 optical glass Substances 0.000 description 2
- 238000004454 trace mineral analysis Methods 0.000 description 2
- 230000005457 Black-body radiation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0087—Simple or compound lenses with index gradient
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- 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
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0025—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having one lens only
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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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
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B2003/0093—Simple or compound lenses characterised by the shape
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
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Abstract
本發明涉及具有90度水平視角之長波長紅外線攝影機及攝影機用鏡頭,其係由模製成型用光學材料形成,包括:凹面(R2),用於對從被拍攝體入射的光進行第一次折射;以及凸面(R3),用於對穿過上述凹面(R2)的光進行第二次折射,上述凹面(R2)和凸面(R3)根據以下式1、表1及表2的關係而定:
其中,k為圓錐曲面係數,A4、A6、A8、A10及A12為非球面係數,h為從光軸至凹面或凸面的距離,c表示中心曲率,
其中,曲率半徑和面厚度具有±0.5%的公差,(凹面(R2)的直徑)/(凸面(R3)的直徑)為0.45(±0.5%的公差)。 Among them, the radius of curvature and the surface thickness have a tolerance of ±0.5%, (the diameter of the concave surface (R2)) / (the diameter of the convex surface (R3)) is 0.45 (±0.5% tolerance).
Description
本發明涉及具有90度水平視角之長波長紅外線攝影機及攝影機用鏡頭,更詳細地,涉及可用多種智慧設備的普及型長波長紅外線(又名「LWIR」)攝影機及攝影機用鏡頭。 The present invention relates to a long-wavelength infrared camera and a camera lens having a 90-degree horizontal viewing angle, and more particularly to a popular long-wavelength infrared (also known as "LWIR") camera and a camera lens that can be used with various smart devices.
長波長紅外線為8μm~12μm波長的光,包括人類釋放的紅外線的波長範圍。 Long-wavelength infrared rays are light having a wavelength of 8 μm to 12 μm, including the wavelength range of infrared rays emitted by humans.
長波長紅外線攝影機為可通過檢測在夜間人類或動物釋放的紅外線來成像的攝影機。 Long-wavelength infrared cameras are cameras that can be imaged by detecting infrared rays emitted by humans or animals at night.
人類或動物的體溫為310K左右,黑體輻射的310K中的峰值波長為8μm~12μm。 The body temperature of human or animal is about 310K, and the peak wavelength of 310K of black body radiation is 8μm~12μm.
因此,可通過長波長紅外線攝影機從人類或動物所釋放的紅外線能量判斷是否存在人類或動物以及獲取影像。 Therefore, it is possible to judge whether or not humans or animals are present and to acquire images by infrared energy emitted from humans or animals by a long-wavelength infrared camera.
但是,在韓國的情況下,長波長紅外線專用鏡頭和長波長紅外線攝影機系統的開發極為緩慢,因而實際情況為大部分依賴進口,且以高價銷售。 However, in the case of South Korea, the development of long-wavelength infrared-specific lenses and long-wavelength infrared camera systems is extremely slow, so the actual situation is mostly dependent on imports and sold at high prices.
尤其,以往的紅外線攝影機以基於鍺(Germanium)鏡頭的直加工鏡頭為主來進行製造,因而製造成本高且製造時間長。 In particular, since the conventional infrared camera is mainly manufactured by a direct processing lens based on a Germanium lens, the manufacturing cost is high and the manufacturing time is long.
因此,鍺鏡頭主要適用於軍事領域,在民用領域因價 格問題而很少使用。 Therefore, the Xenon lens is mainly used in the military field, and the price is in the civilian sector. The grid problem is rarely used.
進而,在適用於智慧設備的鏡頭的情況下,需要呈超小型形體的形狀,因此需要用於解決上述問題的模製成型鏡頭。 Further, in the case of a lens suitable for a smart device, it is required to have a shape of an ultra-small body, and therefore, a molded lens for solving the above problem is required.
專利文獻1:韓國授權專利公報第10-0916502 B1號(2009年09月01日) Patent Document 1: Korean Patent Publication No. 10-0916502 B1 (September 01, 2009)
本發明為了解決上述現有技術的問題而提出,本發明的目的在於,提供可適用模製成型用光學材料,因此,與以往的鍺鏡頭相比,可降低生產成本,並可通過大量生產簡單適用於民用領域的具有90度水平視角之長波長紅外線攝影機及攝影機用鏡頭。 SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide an optical material suitable for molding, which can reduce production cost and can be easily produced by mass production as compared with a conventional xenon lens. A long-wavelength infrared camera and camera lens with a 90-degree horizontal viewing angle for the civilian sector.
並且,本發明的目的在於,提供與以往鍺材料的光學設備相比,可體現鮮明的影像,從而可適用於各種智慧設備的具有90度水平視角之長波長紅外線攝影機及攝影機用鏡頭。 Further, an object of the present invention is to provide a long-wavelength infrared camera and a lens for a camera having a 90-degree horizontal viewing angle that can be applied to various smart devices as compared with optical devices of conventional materials.
為了實現上述目的,本發明的具有90度水平視角之長波長紅外線攝影機用鏡頭為如下的具有90度水平視角之鏡頭,即,其係由模製成型用光學材料形成,包括:凹面R2,用於對從被拍攝體入射的光進行第一次折射;以及凸面R3,用於對穿過上述凹面R2的光進行第二次折射,上述凹面R2和凸面R3根據以下式1、表1及表2的關係而定:[式1]
其中,k為圓錐曲面係數,A4、A6、A8、A10及A12為非球面係數,h為從光軸至凹面或凸面的距離,c表示中心曲率,
其中,曲率半徑和面厚度具有±0.5%的公差,(凹面(R2)的直徑)/(凸面(R3)的直徑)為0.45(±0.5%的公差)。 Among them, the radius of curvature and the surface thickness have a tolerance of ±0.5%, (the diameter of the concave surface (R2)) / (the diameter of the convex surface (R3)) is 0.45 (±0.5% tolerance).
本發明的特徵在於,上述鏡頭形成有從上述凹面R2和凸面R3之間沿著與光軸垂直的方向延伸的邊緣部。 The present invention is characterized in that the lens is formed with an edge portion extending from the concave surface R2 and the convex surface R3 in a direction perpendicular to the optical axis.
如請求項2之具有90度水平視角之長波長紅外線攝影機的特徵在於,(凹面R2和凸面R3的中心部厚度TC/直徑的平均值)為0.88(±0.5%的公差),(鏡頭的邊緣部厚度)/(凹面R2和凸面R3的中心部厚度TC)為0.57(±0.5%的公差)。 A long-wavelength infrared camera having a 90-degree horizontal viewing angle as claimed in claim 2 is characterized in that (the average of the central portion thickness TC/diameter of the concave surface R2 and the convex surface R3) is 0.88 (±0.5% tolerance), (the edge of the lens) The thickness of the portion) / (the thickness TC of the central portion of the concave surface R2 and the convex surface R3) is 0.57 (±0.5% tolerance).
本發明的具有90度水平視角之長波長紅外線攝影機的特徵在於,包括:光圈;上述鏡頭;紅外線濾光器,從上述凸面R3隔開設置;以及傳感面,通過經由上述紅外線濾光器的光來使被拍攝體成像。 The long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention includes: an aperture; the lens; an infrared filter disposed apart from the convex surface R3; and a sensing surface passing through the infrared filter Light to image the subject.
本發明的特徵在於,上述光圈與上述凹面R2之間的距離為0.13mm±0.5%,上述凹面R2和凸面R3的中心部厚度TC為 2.62mm±0.5%,從上述凸面R3至紅外線濾光器的距離為1.1934mm±0.5%,紅外線濾光器的厚度為0.725mm±0.5%,從上述紅外線濾光器至傳感面的距離為0.615mm±0.5%,上述濾光器的折射率為3.421,分散率為2421.0。 The present invention is characterized in that the distance between the diaphragm and the concave surface R2 is 0.13 mm ± 0.5%, and the thickness TC of the central portion of the concave surface R2 and the convex surface R3 is 2.62mm±0.5%, the distance from the convex surface R3 to the infrared filter is 1.1934mm±0.5%, and the thickness of the infrared filter is 0.725mm±0.5%, and the distance from the infrared filter to the sensing surface is 0.615 mm ± 0.5%, the above filter has a refractive index of 3.421 and a dispersion ratio of 2421.0.
根據如上所述的結構的本發明,作為智慧設備用光學系統,可以僅通過一個鏡頭探測生物或事物,從而可適用於一般智慧手機和多種電子產品。 According to the present invention having the structure as described above, as an optical system for a smart device, it is possible to detect a living thing or a thing by only one lens, and thus it is applicable to a general smart phone and various electronic products.
並且,根據本發明,呈可通過模塑成型的結構,從而便於製造並可大量生產,且還具有製造成本低廉的優點。 Further, according to the present invention, it is a structure which can be molded, which is easy to manufacture and can be mass-produced, and has an advantage of being inexpensive to manufacture.
100‧‧‧光圈 100‧‧‧ aperture
200‧‧‧鏡頭 200‧‧‧ lens
210‧‧‧邊緣部 210‧‧‧Edge
300‧‧‧紅外線濾光器 300‧‧‧Infrared filter
400‧‧‧傳感面 400‧‧‧ Sensing surface
1000‧‧‧具有90度水平視角之長波長紅外線攝影機 1000‧‧‧Long-wavelength infrared camera with 90-degree horizontal viewing angle
R2‧‧‧凹面 R2‧‧‧ concave
R3‧‧‧凸面 R3‧‧‧ convex
圖1(a)及(b)為本發明的具有90度水平視角之長波長紅外線攝影機的立體圖。 1(a) and (b) are perspective views of a long wavelength infrared camera having a 90 degree horizontal viewing angle of the present invention.
圖2為示出圖1的光學系統結構的結構圖。 Fig. 2 is a structural view showing the structure of the optical system of Fig. 1.
圖3為本發明的具有90度水平視角之長波長紅外線攝影機的光跟蹤分析圖。 3 is a light trace analysis diagram of a long wavelength infrared camera having a 90 degree horizontal viewing angle of the present invention.
圖4為示出本發明的具有90度水平視角之長波長紅外線攝影機的縱向球面像差(longitudinal spherical abberration)的圖表。 4 is a graph showing longitudinal spherical abberration of a long wavelength infrared camera having a 90 degree horizontal viewing angle of the present invention.
圖5為與本發明的具有90度水平視角之長波長紅外線攝影機的像散(astigmatism)相關的像差分析圖。 Fig. 5 is a diagram showing aberration analysis relating to astigmatism of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention.
圖6為示出本發明的具有90度水平視角之長波長紅外線攝影機的畸變像差(distortion)的圖表。 Fig. 6 is a graph showing distortion of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention.
圖7為對示出本發明的具有90度水平視角之長波長紅外線攝 影機的解析度的調製傳遞函數(MTF,Modulation Transfer Function)進行分析的圖表。 Figure 7 is a view showing a long wavelength infrared ray having a 90 degree horizontal viewing angle of the present invention. A chart for analyzing the resolution transfer function (MTF, Modulation Transfer Function) of the resolution of the camera.
圖8為示出本發明的具有90度水平視角之長波長紅外線攝影機的點圖(spot diagram)的圖。 Fig. 8 is a view showing a spot diagram of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention.
以下,參照附圖,詳細說明本發明的較佳實施例。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
如圖1和圖2所示,本發明的具有90度水平視角之長波長紅外線攝影機1000包括:光圈100;鏡頭200,包括凹面R2和凸面R3,上述凹面R2用於對從被拍攝體入射的光進行第一次折射,上述凸面R3用於對穿過上述凹面R2的光進行第二次折射;紅外線濾光器300,從上述凸面R3隔開設置;以及傳感面400,通過經由上述紅外線濾光器300的光來使被拍攝體成像。 As shown in FIGS. 1 and 2, the long-wavelength infrared camera 1000 having a 90-degree horizontal viewing angle of the present invention includes: an aperture 100; a lens 200 including a concave surface R2 and a convex surface R3 for incident on a subject from a subject. The light is first refracted, the convex surface R3 is used for second refracting the light passing through the concave surface R2; the infrared ray filter 300 is disposed apart from the convex surface R3; and the sensing surface 400 is passed through the infrared ray The light of the filter 300 images the subject.
首先,配置於上述凸面R3前部面的光圈100執行防止雜光入射本發明的光學系統的作用。 First, the diaphragm 100 disposed on the front surface of the convex surface R3 performs an action of preventing the stray light from entering the optical system of the present invention.
上述鏡頭200整體具有正(+)折射率,兩面為非球面。 The lens 200 described above has a positive (+) refractive index as a whole and an aspherical surface on both sides.
上述具有90度水平視角之鏡頭200由模製成型用光學材料形成。 The above-described lens 200 having a 90 degree horizontal viewing angle is formed of a molded optical material.
模製成型用光學材料由玻璃或塑膠等形成,與以往在市場銷售的類似種類的材料相比,通過使用折射率和鏡頭透射特性高的材料,從而較佳採用可構成從超小口徑鏡頭至中口徑鏡頭的多種光學系統的材料。 The optical material for molding is formed of glass or plastic, and is preferably made of an ultra-small aperture lens by using a material having a high refractive index and a lens transmission characteristic as compared with a similar type of material which has been commercially available. Material for a variety of optical systems to medium-caliber lenses.
例如,適用於本發明的光學系統設計的鏡頭材料為Ge27.5-Sb13.5-Se60等模製成型用材料,可使用具有2.5以上的折射率和高至12μm的波長帶的65%以上的高透射度的材料。 For example, a lens material suitable for the optical system design of the present invention is a molding material such as Ge 27.5 -Sb 13.5 -Se 60, and a refractive index of 2.5 or more and a wavelength band of up to 12 μm can be used. Highly transmissive material.
若通過這種本發明的光學材料構成光學系統,則與以往相比,可體現鮮明的影像,可進行基於模塑的成型,從而可構成製造簡單、製造成本低的安全監控普及型長波長紅外線攝影機光學系統。 When the optical system of the optical material of the present invention is used, it is possible to embody a clear image and to perform molding based molding, thereby constituting a simple and low-cost safety monitoring and popular long-wavelength infrared ray. Camera optical system.
並且,本發明的具有90度水平視角之長波長紅外線攝影機1000進行適用6400圖元(感測器)的1組1個普及型長波長紅外線的光學設計。 Further, the long-wavelength infrared camera 1000 having a 90-degree horizontal viewing angle of the present invention performs optical design of one set of one popular long-wavelength infrared rays to which 6400 primitives (sensors) are applied.
本發明的光學系統增加鏡頭中心部和邊緣部210的厚度,從而呈有利於模製成型的形態。 The optical system of the present invention increases the thickness of the lens center portion and the edge portion 210, thereby facilitating the molding.
並且,本發明的鏡頭200的上述凹面R2和凸面R3根據以下式1的關係而定。 Further, the concave surface R2 and the convex surface R3 of the lens 200 of the present invention are determined according to the relationship of the following formula 1.
其中,k為圓錐曲面係數,A4、A6、A8、A10及A12為非球面係數,h為從光軸至凹面或凸面的距離,c表示中心曲率。 Where k is the conic surface coefficient, A4, A6, A8, A10, and A12 are aspherical coefficients, h is the distance from the optical axis to the concave or convex surface, and c is the central curvature.
如下表1所示,通過確定非球面係數來規定凹面R2和凸面R3。 As shown in Table 1 below, the concave surface R2 and the convex surface R3 are defined by determining the aspherical coefficient.
並且,如下表2所示,設定鏡頭200的凹面R2和凸面R3的曲率半徑RC和面厚度ST,並確定折射率n和分散率v1。 Further, as shown in Table 2 below, the curvature radius RC and the surface thickness ST of the concave surface R2 and the convex surface R3 of the lens 200 are set, and the refractive index n and the dispersion ratio v1 are determined.
上述分散率v1通過下式而定。 The above dispersion ratio v1 is determined by the following formula.
[式2]v1=(n110-1)/(n108-n112) [Formula 2] v1=(n110-1)/(n108-n112)
其中,n110為波長為10μm的1個鏡頭的折射率,n108為波長為8.0μm的1個鏡頭的折射率,n112為波長為12μm的1個鏡頭的折射率,2.0<n110<3.0 Wherein n110 is a refractive index of one lens having a wavelength of 10 μm, n108 is a refractive index of one lens having a wavelength of 8.0 μm, and n112 is a refractive index of one lens having a wavelength of 12 μm, and 2.0<n110<3.0
其中,曲率半徑和面厚度可具有±0.5%的公差。 Among them, the radius of curvature and the thickness of the face may have a tolerance of ±0.5%.
尤其,(凹面R2和凸面R3的中心部厚度TC/直徑的平均值)的值為0.88(±0.5%的公差),(鏡頭的邊緣部厚度)/(上述凹面R2和凸面R3的中心部厚度TC)的值為0.57(±0.5%的公差),因此,可準確調整90度的視角。 In particular, the value of (the average value of the central portion thickness TC/diameter of the concave surface R2 and the convex surface R3) is 0.88 (±0.5% tolerance), (thickness of the edge portion of the lens) / (the thickness of the central portion of the concave surface R2 and the convex surface R3 described above) The value of TC) is 0.57 (±0.5% tolerance), so the angle of view of 90 degrees can be accurately adjusted.
並且,鏡頭中心部和邊緣部的厚度厚,因此,可呈有利於模製成型的形態。 Further, since the thickness of the center portion and the edge portion of the lens is thick, it can be in a form advantageous for molding.
根據本發明,可將上述光圈與上述凹面R2之間的距離設定為0.13mm±0.5%,上述凹面R2和凸面R3的中心部厚度TC設定為2.62mm±0.5%,從上述凸面R3至紅外線濾光器的距離設定為1.1934mm±0.5%,紅外線濾光器的厚度設定為0.725mm±0.5%,從上述紅外線濾光器至傳感面的距離設定為0.615mm±0.5%。 According to the present invention, the distance between the diaphragm and the concave surface R2 can be set to 0.13 mm ± 0.5%, and the thickness TC of the central portion of the concave surface R2 and the convex surface R3 is set to 2.62 mm ± 0.5%, from the convex surface R3 to the infrared filter. The distance of the optical device was set to 1.1934 mm ± 0.5%, the thickness of the infrared filter was set to 0.725 mm ± 0.5%, and the distance from the above infrared filter to the sensing surface was set to 0.615 mm ± 0.5%.
若在本發明的鏡頭200設定厚度公差,則可在所製造的鏡頭的允許公差之內進行製造,從而可製造具有規定光學性能的鏡頭。 If the thickness tolerance is set in the lens 200 of the present invention, it can be manufactured within the allowable tolerance of the manufactured lens, so that a lens having a predetermined optical performance can be manufactured.
並且,以圓弧形態製造鏡頭200的邊緣部分,從而可有利於光學系統的組裝及製造。 Further, the edge portion of the lens 200 is manufactured in a circular arc shape, which facilitates assembly and manufacture of the optical system.
另一方面,較佳地,上述紅外線濾光器300的折射率為3.421,分散率為2421.0。 On the other hand, preferably, the infrared filter 300 has a refractive index of 3.421 and a dispersion ratio of 2421.0.
通過上述條件,可獲得規定的視角並可使縱向球面像差、像散及畸變像差最小化,並可在表示解析度的調製傳遞函數值內獲取良好的狀態。 By the above conditions, a predetermined viewing angle can be obtained and longitudinal spherical aberration, astigmatism, and distortion aberration can be minimized, and a good state can be obtained within the value of the modulation transfer function indicating the resolution.
基於如上所述的結構來記載本發明的具有90度水平視角之長波長紅外線攝影機1000的例示性一實施例。 An exemplary embodiment of the long wavelength infrared camera 1000 having a 90 degree horizontal viewing angle of the present invention is described based on the structure as described above.
首先,本發明的具有90度水平視角之長波長紅外線攝影機的鏡頭200為可適用於安全監控領域的長波長紅外線用攝影機光學系統的鏡頭,通過適用由Ge27.5-Sb13.5-Se60形成的非氧化物紅外光學玻璃來進行模製成型。 First, the lens 200 of the long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention is a lens of a long-wavelength infrared camera optical system applicable to the field of security monitoring, by applying a non-form formed by Ge 27.5 - Sb 13.5 - Se 60 Oxide infrared optical glass is used for molding.
並且,分別將上述鏡頭200的凹面R2和凸面R3的曲率半徑設定為-13.1807mm(非球面)、-2.6572mm(非球面)、凹面R2的直徑設定為1.84mm,凸面R3的直徑設定為4.12mm。 Further, the curvature radius of the concave surface R2 and the convex surface R3 of the lens 200 is set to -13.1807 mm (aspheric surface), -2.6572 mm (aspheric surface), and the diameter of the concave surface R2 is set to 1.84 mm, and the diameter of the convex surface R3 is set to 4.12. Mm.
整個鏡頭200形成2.745mm的厚度。 The entire lens 200 is formed to a thickness of 2.745 mm.
為了進行安裝,形成從上述凹面R2和凸面R3沿著與光軸垂直的方向延伸的邊緣部210,當考慮上述邊緣部210時,將整個鏡頭的直徑設定為6.0mm。 For the mounting, the edge portion 210 extending from the concave surface R2 and the convex surface R3 in the direction perpendicular to the optical axis is formed. When the edge portion 210 is considered, the diameter of the entire lens is set to 6.0 mm.
可適當調節上述邊緣部210的長度。 The length of the above-described edge portion 210 can be appropriately adjusted.
在上述邊緣部210的邊緣部分形成有0.3~0.6mm的圓弧形部。 An arcuate portion of 0.3 to 0.6 mm is formed at an edge portion of the edge portion 210.
鏡頭200的凹面R2和凸面R3通過上述式1和表1 及表2形成。 The concave surface R2 and the convex surface R3 of the lens 200 pass the above formula 1 and table 1. And Table 2 is formed.
並且,分別將凹面R2和凸面R3的中心部厚度TC設定為2.62mm,鏡頭的邊緣部厚度設定為1.495。 Further, the central portion thickness TC of the concave surface R2 and the convex surface R3 was set to 2.62 mm, respectively, and the thickness of the edge portion of the lens was set to 1.495.
並且,將上述光圈100與上述凹面R2之間的距離設定為0.13mm,從上述凸面R3至紅外線濾光器300的距離設定為1.1934mm,紅外線濾光器300的厚度設定為0.72mm,從上述紅外線濾光器300至傳感面400的距離設定為0.615mm。 Further, the distance between the diaphragm 100 and the concave surface R2 is set to 0.13 mm, the distance from the convex surface R3 to the infrared filter 300 is set to 1.1934 mm, and the thickness of the infrared filter 300 is set to 0.72 mm. The distance from the infrared filter 300 to the sensing surface 400 is set to 0.615 mm.
採用折射率為3.421,分散率為2421.0的上述紅外線濾光器300。 The above infrared filter 300 having a refractive index of 3.421 and a dispersion ratio of 2421.0 was used.
並且,作為上述傳感面400的感測器,可採用80×80圖元的34μm感測器。 Further, as the sensor of the above-described sensing surface 400, a 34 μm sensor of 80 × 80 pixels can be used.
對於上述結構的本發明的具有90度水平視角之長波長紅外線攝影機1000,可獲得圖3至圖8的實驗結果。 With respect to the long-wavelength infrared camera 1000 of the present invention having the 90-degree horizontal viewing angle of the above configuration, the experimental results of FIGS. 3 to 8 can be obtained.
圖3為本發明的具有90度水平視角之長波長紅外線攝影機的光跟蹤分析圖。圖4為示出本發明的具有90度水平視角之長波長紅外線攝影機的縱向球面像差的圖表。圖5為與本發明的具有90度水平視角之長波長紅外線攝影機的像散相關的像差分析圖。圖6為示出本發明的具有90度水平視角之長波長紅外線攝影機的畸變像差的圖表。圖7為對示出本發明的具有90度水平視角之長波長紅外線攝影機的解析度的調製傳遞函數進行分析的圖表。圖8為示出本發明的具有90度水平視角之長波長紅外線攝影機的點圖(spot diagram)的圖。 3 is a light trace analysis diagram of a long wavelength infrared camera having a 90 degree horizontal viewing angle of the present invention. 4 is a graph showing longitudinal spherical aberration of a long wavelength infrared camera having a 90 degree horizontal viewing angle of the present invention. Fig. 5 is an aberration analysis diagram relating to astigmatism of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention. Fig. 6 is a graph showing distortion aberration of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention. Fig. 7 is a graph showing a modulation transfer function showing the resolution of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention. Fig. 8 is a view showing a spot diagram of a long-wavelength infrared camera having a 90-degree horizontal viewing angle of the present invention.
如圖3至圖8所示,本發明的具有90度水平視角之長波長紅外線攝影機在幾乎所有欄位中,相的值與中心軸相鄰,因 而不僅表示各種像差的校準狀態良好,還表示滿足調製傳遞函數(光學需求性能/解析度)。 As shown in FIGS. 3 to 8, the long-wavelength infrared camera of the present invention having a horizontal viewing angle of 90 degrees is adjacent to the central axis in almost all fields, because Not only the calibration state indicating various aberrations is good, but also the modulation transfer function (optical demand performance/resolution) is satisfied.
並且,本發明的光學系統的周邊光亮比以0.7Field為基準,確保85%以上,失真率以0.7Field為基準,確保27%的光學系統性能。 Further, in the optical system of the present invention, the peripheral brightness ratio is 85% or more based on 0.7 Field, and the distortion rate is based on 0.7 Field, thereby ensuring 27% of optical system performance.
而且,可製造成鏡頭直徑為6mm、且鏡頭厚度為2.8mm以內,從而可適用於多種智慧設備(手機、筆記型電腦、各種電子設備等)。 Moreover, it can be manufactured with a lens diameter of 6 mm and a lens thickness of 2.8 mm, which is suitable for a variety of smart devices (mobile phones, notebook computers, various electronic devices, etc.).
因此,可充分適用非氧化物紅外光學玻璃等模製成型用光學材料,因此,與以往鍺鏡頭相比,可降低生產成本,並可通過大量生產簡單適用於民用領域。 Therefore, the optical material for molding such as non-oxide infrared optical glass can be sufficiently applied, so that the production cost can be reduced as compared with the conventional xenon lens, and it can be easily applied to the civilian field through mass production.
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KR102299461B1 (en) * | 2020-01-10 | 2021-09-07 | 한국광기술원 | Angle of view 40-degree far-infrared optical system with uniform resolution for each image area |
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