KR100337371B1 - Zoom lens optical system for mid-infrared - Google Patents
Zoom lens optical system for mid-infrared Download PDFInfo
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- KR100337371B1 KR100337371B1 KR1019990032461A KR19990032461A KR100337371B1 KR 100337371 B1 KR100337371 B1 KR 100337371B1 KR 1019990032461 A KR1019990032461 A KR 1019990032461A KR 19990032461 A KR19990032461 A KR 19990032461A KR 100337371 B1 KR100337371 B1 KR 100337371B1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 238000003384 imaging method Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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- 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
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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
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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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
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
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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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Abstract
본 발명에 의한 중적외선 파장대역 줌 광학계는 줌 광학계의 배율 변화를 담당하는 줌잉부와 줌잉부에 의한 중간상을 재결상하고 수차를 보정하는 결상부로 구성된다. 줌잉부는 4군 줌 렌즈계(제 1 렌즈군 내지 제 4 렌즈군)로 설계하였으며 각 군을 구성하는 렌즈 매수는 총 7매로 광학계의 질량 및 크기를 줄이면서도 광학적 성능은 우수하게 유지되도록 설계되었다. 특히, 배율 변화의 역할을 담당하는 줌잉부의 제 2 렌즈군의 총 이동 거리가 68.0mm로 매우 짧고, 배율이 증가함에 따라 선형에 가깝도록 증가하게 설계되어 전자/기구적인 구동이 용이하다. 초점조절 렌즈인 줌잉부의 제 4 렌즈군의 후방 초점거리와 결상부의 전방 초점거리를 매우 길게하여 광학적 잡음제거를 위한 필드 스톱을 놓거나 화질 개선을 위한 마이크로 주사장치 등의 설치가 용이하도록 한다.The mid-infrared wavelength band zoom optical system according to the present invention is composed of a zooming unit which is responsible for the magnification change of the zoom optical system and an imaging unit which re-images the intermediate image by the zooming unit and corrects aberration. The zooming unit is designed as a group 4 zoom lens system (first lens group to fourth lens group), and the number of lenses constituting each group is a total of seven, designed to maintain excellent optical performance while reducing mass and size of the optical system. In particular, the total moving distance of the second lens group of the zooming part, which plays a role of the magnification change, is very short as 68.0 mm, and is designed to increase to a near linear shape as the magnification increases, thereby facilitating electronic / mechanical driving. The rear focal length of the fourth lens group of the focusing lens, which is the focusing lens, and the front focal length of the image forming part are made very long so that it is easy to install a field stop for optical noise reduction or a micro scanning device for improving image quality.
Description
본 발명은 파장 3㎛∼5㎛인 중적외선 대역 줌 렌즈 광학계, 더 상세하게는 상기 파장 대역에서 우수한 광학적 성능을 가지면서, 1 내지 20배 사이의 배율을연속적으로 변화시킴으로써 시계를 1.5°X 2.0°에서 30°X 40°까지 가변할 수 있는 중적외선 대역 줌(zoom) 렌즈 광학계에 관한 것이다.The invention is a mid-infrared band zoom lens optical system having a wavelength of 3 μm to 5 μm, and more particularly 1.5 ° × 2.0 by continuously changing the magnification between 1 and 20 times while having excellent optical performance in the wavelength band. A mid-infrared band zoom lens optic that can vary from ° to 30 ° X 40 °.
카메라 등에 사용되는 종래의 줌 렌즈 광학계는 일반적으로 4개의 렌즈군, 즉 물체로부터 상까지 순서대로, 양 굴절능의 제 1 렌즈군, 초점길이를 조절하는 음의 굴절능의 제 2 렌즈군, 양의 굴절능의 제 3 렌즈군, 및 줌렌즈의 초점을 맞추고 줌잉(zooming)에 의한 상 위치 변화를 보정하는 제 4 렌즈군으로 이루어져 있다. 이러한 종래의 줌 렌즈 광학계에서는 신속한 포커싱에 의하여 수차가 심하게 생기는 단점이 있을 뿐 아니라, 높은 배율변화를 위하여 광학계의 전체 길이가 길어진다는 단점이 있었다.Conventional zoom lens optical systems used in cameras or the like generally have four lens groups, that is, a first lens group of positive refractive power, a second lens group of negative refractive power that adjusts the focal length, in order from an object to an image And a fourth lens group for focusing the zoom lens and correcting a change in image position due to zooming. In the conventional zoom lens optical system, not only the aberration is severely generated by rapid focusing, but also the overall length of the optical system is long for a high magnification change.
또한, 3㎛∼5㎛ 파장대역에서 사용되는 적외선 줌렌즈 광학계는 통상 기계보정식 4렌즈군으로 구성되어 있으나, 줌비를 20:1까지 올릴 수 없을 뿐 아니라, 줌비가 증가할수록 시스템 전체의 길이가 매우 길어지는 경향이 있으며 넓은 파장대역을 쓰는 적외선 광학계의 특성상 수차보정을 위하여 회절면이나 비구면을 많이 사용함으로써 렌즈의 가공이 어렵고 제작비용이 많이 소요된다는 단점이 있다. 또한, 변조전달함수(Modulation Transfer Function)의 값이 시계의 중심부근에서는 우수한 값을 가지지만 가장자리로 갈수록 그 성능이 급격하게 떨어진다는 단점도 있다.In addition, the infrared zoom lens optical system used in the wavelength range of 3㎛ ~ 5㎛ is usually composed of a group of four mechanical correction type lens, but not only can not increase the zoom ratio up to 20: 1, the longer the zoom ratio increases the overall system length Due to the characteristics of the infrared optical system using a wide wavelength band, the diffraction surface or the aspheric surface are used for the aberration correction, which is difficult to process the lens and the manufacturing cost is high. In addition, although the value of the Modulation Transfer Function has an excellent value near the center of the field of view, its performance drops sharply toward the edge.
본 발명은 이러한 종래 기술에 의한 중적외선 파장대역 줌렌즈의 단점을 극복하기 위한 것으로, 20:1에 달하는 높은 줌비를 가지면서도 시스템 전체의 길이가 짧고 제작이 용이할 뿐 아니라, 시계가장자리에서도 우수한 성능을 가지는 중적외선 파장대역 줌렌즈를 제공하고자 한다.The present invention is to overcome the shortcomings of the conventional mid-infrared wavelength zoom zoom lens, and has a high zoom ratio of 20: 1, but the system is short in length and easy to manufacture, and excellent performance in the field of view. It is intended to provide a mid-infrared wavelength band zoom lens.
따라서 본 발명의 목적은 1배 내지 20배의 큰 배율범위에 걸쳐 연속적으로 변화할 수 있고, 포커싱 및 줌잉시에 광학적 성능에 변화를 주지 않는 중적외선 영역 줌 렌즈 광학계를 제공하는 것이다.It is therefore an object of the present invention to provide a mid-infrared region zoom lens optical system that can vary continuously over a large magnification range of 1 to 20 times and does not change optical performance during focusing and zooming.
본 발명의 다른 목적은 비교적 작은 수의 렌즈로 이루어짐에도 불구하고, 1:20 에 이르는 높은 줌비를 가지고, 수차가 거의 없는 우수한 성능의 중적외선대역 줌 렌즈 광학계를 제공하는 것이다.Another object of the present invention is to provide an excellent mid-infrared band zoom lens optical system having a high zoom ratio of 1:20, and having almost no aberration, despite being made of a relatively small number of lenses.
본 발명의 또 다른 목적은 배율변화에 필요한 기구/광학적인 구동 및 제작이 용이한 줌 렌즈 광학계를 제공하는 것이다.It is still another object of the present invention to provide a zoom lens optical system that is easy to manufacture and implement a mechanism / optical drive required for magnification change.
도 1은 시계 1.5°X 2.0°에 해당하는 고배율(20배)상태에서 본 발명에 의한 줌 렌즈 광학계의 광학적 배치를 보인 단면도이다.1 is a cross-sectional view showing an optical arrangement of a zoom lens optical system according to the present invention in a high magnification (20 times) state corresponding to 1.5 ° × 2.0 ° of a field of view.
도 2도는 시계 30°X 40°에 해당하는 저배율(기준배율)상태에서의 광학적 배치를 보인 단면도이다.2 is a cross-sectional view showing the optical arrangement in a low magnification (reference magnification) state corresponding to 30 ° × 40 ° of the field of view.
도 3은 고배율에서 저배율까지 본 발명에 의한 줌 렌즈 광학계의 가변자인 제 2 렌즈와 보상자인 제 3 렌즈의 줌 궤적을 보인 단면도이다. 가로축은 제 1 렌즈로부터의 거리를 나타낸다.3 is a cross-sectional view showing a zoom trajectory of a second lens, which is a variable variable of the zoom lens optical system, and a third lens, which is a compensator, from a high magnification to a low magnification. The horizontal axis represents the distance from the first lens.
도 4는 고배율인 1.5°X 2.0°상태에서 본 발명에 의한 줌 렌즈 광학계의 중심파장인 4㎛에 대한 축상 변조전달함수(Modulation Transfer Function; MTF)를 보인 도면이다.4 is a diagram showing an axial modulation transfer function (MTF) for 4 μm, which is the center wavelength of a zoom lens optical system according to the present invention, at a high magnification of 1.5 ° × 2.0 °.
본 발명에 의한 중적외선 파장대역 줌 광학계는 적외선 검출기를 최종 상면에 놓을 때 비네팅(vignetting)에 의한 광학적 오차(Errors)를 줄이면서도 줌 대물렌즈(objective)의 크기를 최소화하기 위한 릴레이 형태의 재결상계(reimaging system)로 설계되었으며, 크게 줌 광학계의 배율 변화를 담당하는 줌잉부와, 줌잉부에 의한 중간상을 재결상하고 수차를 보정하는 결상부로 구성된다. 줌잉부는 4군 줌 렌즈계로 설계하였으며 각 군을 구성하는 렌즈 매수는 총 7매로 비교적 작아 광학계의 질량 및 크기를 줄이면서도 광학적 성능은 우수하게 유지되도록 설계되었다. 특히, 줌 렌즈 광학계에서 배율 변화의 역할을 담당하는 줌잉부의 가변자 렌즈군(제 2 렌즈군; G2)이 기준배율(1.0배)에서 20.0배까지의 배율변화시 이동하는 총거리가 68.0mm 이하로 매우 짧으며, 배율변화에 따른 이동량이 거의 선형을 유지함으로써 구동이 용이하게 된다.The mid-infrared wavelength band zoom optical system according to the present invention is a relay type reimaging system for minimizing the size of the zoom objective lens while reducing the optical errors caused by vignetting when the infrared detector is placed on the final image. It is designed as a (reimaging system), and is composed of a zooming part which is largely responsible for the magnification change of the zoom optical system, and an imaging part which re-images the intermediate image by the zooming part and corrects aberration. The zooming unit is designed with a 4 group zoom lens system, and the number of lenses constituting each group is relatively small (7 total), which reduces the mass and size of the optical system while maintaining excellent optical performance. In particular, the total distance that the variable lens group (the second lens group; G2) of the zooming part which plays a role of the magnification change in the zoom lens optical system moves when the magnification changes from the reference magnification (1.0 times) to 20.0 times is 68.0 mm. It is very short below, and the driving amount by the change of magnification is kept almost linear, so that driving becomes easy.
또한, 초점조절 렌즈인 줌잉부의 제 4 렌즈군의 후방 초점거리와 결상부의 전방 초점거리를 매우 길게하여 광학적 잡음제거를 위한 필드 스톱을 놓거나 화질 개선을 위한 마이크로 주사장치 등의 설치가 용이하도록 하였다.In addition, the rear focal length of the fourth lens group of the zooming portion, which is the focusing lens, and the front focal length of the image forming portion are made very long so that it is easy to install a field stop for removing optical noise or to install a micro scanning device for improving image quality. .
본 중적외선 줌 렌즈 광학계에서는 실리콘(Si)과 게르마늄(Ge) 두가지 광학재질이 사용되었으며, 수차보정을 위해 총 7매의 렌즈중 줌잉부에 2면, 결상부에 1면만을 비구면으로 적용하고 나머지 렌즈면은 모두 구면으로 하였다. 광학계의 F-수는 F/2.5로 설계되었으나, 이에 제한되는 것은 아니다.In this mid-infrared zoom lens optical system, two optical materials of silicon (Si) and germanium (Ge) were used.For the aberration correction, two lenses were applied as two aspherical parts to the zooming part and one aspherical part for the aberration correction. All lens surfaces were spherical. The F-number of the optical system is designed to be F / 2.5, but is not limited thereto.
이하에서는 첨부되는 도면을 참고하여, 본 발명에 의한 중적외선 대역 줌 렌즈 광학계의 구성을 상세하게 살펴본다. 이하의 설명은 본 발명의 한 실시예일뿐 본 발명의 범위가 그에 한정되는 것은 아니다.Hereinafter, with reference to the accompanying drawings, looks at in detail the configuration of the mid-infrared band zoom lens optical system according to the present invention. The following description is only one embodiment of the present invention, but the scope of the present invention is not limited thereto.
도 1에서 볼 수 있는 바와 같이, 본 발명에 의한 줌 렌즈 광학계는 기계보정식 4 군(群) 줌으로 구성된 줌잉부와, 상기 줌잉부에 의해 1차 결상된 중간상을 재결상하는 결상부로 이루어있고, 상기 줌잉부는 물체쪽으로부터 순서대로 배치되는 제 1,2, 3 및 4 렌즈군(G1~G4)으로 이루어지고, 상기 결상부는 전체적으로 양의 굴절능을 가지는 2 매의 고정 단일렌즈(6, 7)로 이루어진다.As can be seen in Figure 1, the zoom lens optical system according to the present invention is composed of a zooming unit consisting of a mechanical correction type 4 group zoom, and an image forming unit to re-image the intermediate image primarily formed by the zooming unit, The zooming portion is composed of the first, second, third and fourth lens groups G1 to G4 arranged in order from the object side, and the imaging portion has two fixed single lenses 6 and 7 having a positive refractive power as a whole. )
줌잉부를 구성하는 각 렌즈군의 구성을 살펴보면, 제 1 렌즈군(G1)은 줌 렌즈 광학계의 제일 앞(물체측)에 놓이며 양의 굴절능을 갖는 단일렌즈로서, 본 실시예에서는 Φ110mm의 직경을 가짐으로써 구성 렌즈들 중 가장 크며 그 크기와 무게,장비의 밀폐 등을 고려하여 고정배치된다.Looking at the configuration of each lens group constituting the zooming section, the first lens group G1 is a single lens placed in front of the zoom lens optical system (object side) and having a positive refractive power. It has the largest diameter among the constituent lenses and is fixedly placed in consideration of its size, weight, and sealing of equipment.
제 2 렌즈군(G2)은 광축을 따라 전후로 이동함으로써 줌 렌즈 광학계의 배율 변화의 역할을 담당하고, 음의 굴절능을 갖는 단일렌즈(2)로 이루어져 있다.The second lens group G2 plays a role of changing the magnification of the zoom lens optical system by moving back and forth along the optical axis, and consists of a single lens 2 having negative refractive power.
제 3 렌즈군(G3)은 제 2 렌즈군의 이동에 따라 광축을 따라 전후 이동하는 양의 굴절능의 단일렌즈(3)로서, 제 2 렌즈군의 이동에 의하여 광학계의 배율이 변화하는 때 상이 고정된 면에 맺히도록 해 준다.The third lens group G3 is a single lens 3 of positive refractive power that moves back and forth along the optical axis according to the movement of the second lens group, and is different when the magnification of the optical system changes due to the movement of the second lens group. Allow them to stick to a fixed surface.
제 4 렌즈군(G4)은 둘 사이의 거리가 고정되어 함께 광축을 따라 움직이는 2매의 단일렌즈(4, 5)로 이루어져 있고, 전체적으로 양의 굴절능을 가지며, 물체 까지의 거리 변화에 따른 초점조절 렌즈의 역할을 한다.The fourth lens group G4 is composed of two single lenses 4 and 5 moving together along the optical axis with a fixed distance between the two. The fourth lens group G4 has a positive refractive power as a whole and a focal point according to a change in distance to an object. It acts as an adjustable lens.
줌 렌즈 광학계에서 배율 변화의 역할을 담당하는 제 2 렌즈군은 시계 30°x 40°에 해당하는 저배율(기준배율)로부터 시계 1.5°x 2.0°의 고배율(20배)까지 배율을 증가시키데 이동하는 총 거리가 68.0mm로 매우 짧고, 도 3과 같이 모든 배율에 걸쳐 줌 궤적이 휘거나 역행하는 구간 없이 거의 선형에 가깝도록 설계되어 기구/광학적인 구동이 용이하다.The second lens group, which plays a role of magnification change in the zoom lens optical system, moves to increase the magnification from a low magnification (reference magnification) corresponding to 30 ° x 40 ° to a high magnification (20 times) of 1.5 ° x 2.0 °. The total distance is 68.0mm, which is very short, and as shown in FIG. 3, the zoom trajectory is bent almost linearly without any bending or reversing section over all magnifications, thereby facilitating mechanical / optical driving.
광학계는 전체적으로 게르마늄과 실리콘의 광학재료를 사용하고 있으며, 구체적으로는 제 2 렌즈군을 이루는 단일렌즈(2)와, 상기 결상부의 상측(像側)에 있는 단일렌즈(5)의 광학재질을 게르마늄으로 하고, 나머지 모든 렌즈(1,3,4,6,7)의 광학재질은 실리콘으로 하는 것이 바람직하다.The optical system generally uses optical materials of germanium and silicon. Specifically, the optical materials of the single lens 2 constituting the second lens group and the single lens 5 on the image side of the imaging unit are germanium. It is preferable that the optical materials of all the remaining lenses 1, 3, 4, 6, and 7 be silicon.
또한, 전술한 바와 같이 수차보정을 위해 총 7매의 렌즈중 줌잉부에 2면, 결상부에 1면만을 비구면으로 하며, 바람직하게는 제 2 렌즈군(G2)을 이루는 단일렌즈(2)의 상측 면(R4)과, 상기 제 3 렌즈군을 이루는 단일렌즈(3)의 물체측 면(R5), 및 상기 결상부를 이루는 2매의 렌즈(6,7)중 물체측 렌즈(6)의 물체측 면(R11)을 비구면으로 구성하고, 나머지 렌즈의 모든 면(R1,R2,R3,R6,R7,R8,R9,R10,R12,R13, R14) 구면으로 한다.In addition, as described above, for the aberration correction, only two surfaces of the zooming portion and only one surface of the image forming portion are aspherical, and preferably of the single lens 2 forming the second lens group G2. An object of the object-side lens 6 of the two lenses 6 and 7 of the image-side surface R4, the object-side surface R5 of the single lens 3 constituting the third lens group, and the imaging portion The side surface R11 is composed of an aspherical surface, and all surfaces R1, R2, R3, R6, R7, R8, R9, R10, R12, R13, and R14 are spherical surfaces.
또한, 줌잉부와 결상부 사이에 광학적 잡음제거를 위한 필드스톱(field stop) 또는 화질개선을 위한 마이크로주사장치등이 설치될 수 있도록, 상기 줌잉부의 후방초점거리(제 4 렌즈군의 초점거리)와 중간상부터 결상부까지의 거리(결상부의 전방 초점거리)가 충분히 길게 한다.In addition, the rear focusing distance of the zooming portion (focal length of the fourth lens group) may be provided between the zooming portion and the image forming portion so that a field stop for optical noise removal or a micro scanning device for improving image quality may be provided. ) And the distance from the intermediate image to the image forming part (front focal length of the image forming part) are sufficiently long.
2 매의 단일렌즈(6,7)로 구성된 결상상부는 줌잉부에 의해 결상된 중간상을 재결상(reimaging)하고 결상부에 의해 발생된 수차(aberration)를 보상하는 역할을 한다.An imaging section composed of two single lenses 6 and 7 serves to reimaging the intermediate image formed by the zooming section and to compensate for the aberration generated by the imaging section.
이하의 표 1은 본 실시예에 의한 줌렌즈 시스템의 각종 제원을 나타내는 것이고, 표 2는 비구면의 비구면 계수를 나타낸다.Table 1 below shows various specifications of the zoom lens system according to the present embodiment, and Table 2 shows aspherical surface coefficients of the aspherical surface.
이렇게 구성된 줌 렌즈 광학계는, 기준배율(1.0배)에서 20.0배까지 광범위한 배율을 연속적으로 가변할 수 있으며 최소 매수의 광학렌즈로 설계되어 있고, 배율변화를 위한 렌즈 이동거리가 짧아 가볍고 콤팩트하다는 장점을 가진다.The zoom lens system configured in this way can continuously vary a wide range of magnifications from the standard magnification (1.0 times) to 20.0 times, and is designed with a minimum number of optical lenses, and has a short and light moving distance for changing the magnification. Have
또한, 도 4에서 보는 바와 같이 고배율인 1.5°X 2.0°에서 중심파장인 4㎛에 대한 축상변조전달함수(MTF)가 거의 회절한계에 접근하도록 설계되어 있어서, 수차가 보정된 우수한 광학적 성능을 가지는 것을 알 수 있다. 여기에서 y는 MTF값을 나타내며 최고값은 1.0이고 이를 총 5등분하여 0.2씩 증가하는 형식으로 도시하였으며, x축은 공간주파수(cycle/mm)를 나타낸다. 또한, T는 접선방향(tangential) S는 시상방향(sagittal)을 나타낸다.In addition, as shown in FIG. 4, the axial modulation transfer function (MTF) for the center wavelength of 4 μm at a high magnification of 1.5 ° X 2.0 ° is designed to approach almost the diffraction limit, so that the optical aberration has excellent optical performance. It can be seen that. Here, y represents the MTF value, the maximum value is 1.0, and the total value is divided into 5 equal parts by 0.2, and the x axis represents the spatial frequency (cycle / mm). In addition, T represents a tangential S and sagittal.
도면에서 알 수 있는 바와같이, 현재 사용중에 있는 대부분의 중적외선 줌 광학계가 적용되는 시스템에서 구현가능한 한계분해능 근처인 25 cycle/mm에서 중심파장인 4㎛에 대하여 최대 배율인 20배에서 본 줌광학계의 접선방향 MTF값은 축상에서 0.51, 0.5필드에서 0.49, 1.0필드에서 0.41로 축상 성능 뿐만 아니라 모든 필드에서 우수한 성능을 나타낸다.As can be seen in the figure, a zoom optical system viewed at a maximum magnification of 20 times at a center wavelength of 4 μm at 25 cycles / mm near the limit resolution that can be realized in a system to which most mid-infrared zoom optical systems in use are currently applied. The tangential MTF values of are 0.51 on the axis, 0.49 on the 0.5 field, and 0.41 on the 1.0 field.
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