Design of Zoom Lens System with Movable Components Including Large Aperture and with Ultra-Wide Field of View

2021 ◽  
Vol 58 (7) ◽  
pp. 0708001
Author(s):  
沈志娟 Shen Zhijuan ◽  
林海峰 Lin Haifeng ◽  
曹一青 Cao Yiqing
2020 ◽  
Vol 59 (26) ◽  
pp. 7883
Author(s):  
Chao Wang ◽  
Hao-dong Shi ◽  
Zhuang Liu ◽  
Qiang Fu ◽  
Su Zhang ◽  
...  

Author(s):  
Y. Arai ◽  
Y. Ishida ◽  
T. Watabe ◽  
Y. Harada

The image forming lens system of an electron microscope used for medical and biological applications has to meet the following requirements: (1) minimum off-axis aberration and distortion, (2) eliminated image rotation and focus deviation over wide magnification range, and (3) a wide field of view at low magnification. We have developed a new type of electron microscope which has a six-stage image forming lens system to satisfy the above requirements.The present paper describes the features of the electron microscope and also gives some application data for biological fields obtained with this instrument. The electron optical system is designed to provide a wide magnification range of 50x to l,000,000x by using a high resolution side entry goniometer with tilting facility of ±25°. Fig.l shows typical ray diagrams formed by the six-stage image forming system. The system consists of a dual objective (objective lens; OL and objective mini-lens; OM), triple intermediate lens (IL1, IL2 and IL3) and single projector lens (PL).


2004 ◽  
Vol 16 (10) ◽  
pp. 2356-2358 ◽  
Author(s):  
D.-Y. Zhang ◽  
N. Justis ◽  
Y.-H. Lo

Author(s):  
Ton Koonen ◽  
Ketema Mekonnen ◽  
Frans Huijskens ◽  
Zizheng Cao ◽  
Eduward Tangdiongga

2005 ◽  
Vol 17 (10) ◽  
pp. 2128-2130 ◽  
Author(s):  
J.M. Roth ◽  
R.E. Bland ◽  
S.I. Libby

2020 ◽  
Vol 12 (16) ◽  
pp. 2556
Author(s):  
Luca Schifano ◽  
Lien Smeesters ◽  
Francis Berghmans ◽  
Steven Dewitte

We report on the conceptual design of a new wide field-of-view shortwave camera, for measuring Earth’s reflected solar radiation. The camera comprises a commercial-off-the-shelf CMOS sensor, and a custom-designed wide field-of-view lens system with an opening angle of 140°. The estimated effective nadir resolution is 2.2 km. The simulated stand-alone random error of the broadband albedo is 3%. The camera is suited for integration within 1U of a CubeSat.


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