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Proceedings Paper

Development of wide-angle three-mirror system with spiral optical axis
Author(s): Takayuki Nakano; Yoshihiro Matsumoto; Yasuhisa Tamagawa
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Paper Abstract

A design method of wide-angle three-mirror system with spiral optical axis is proposed. Asymmetric optical systems have more degrees of freedom than co-axial systems. The increased degrees of freedom can be applied for removal of ray obscuration by mirrors to achieve wide-angle and low F-number system design. The asymmetric system design requires three-dimensional comprehension of system structure and correction of asymmetric aberrations. In order to simplify the structure comprehension, a base sphere is introduced. The system structure can be changed into the two-dimensional structure of mirror interferences by the base sphere. The dominant asymmetric aberrations are spherical-like and astigmatism-like aberrations. The spherical-like aberration is eliminated by each mirror inidividualy and the astigmatism-like aberration is reduced by counterbalance of whole mirrors. An example of F/2 system with as wide angle as 30x24 degrees FOV is designed. The example system is fabricated by precision machining process for an infrared camera.

Paper Details

Date Published: 9 September 2010
PDF: 8 pages
Proc. SPIE 7652, International Optical Design Conference 2010, 76520O (9 September 2010); doi: 10.1117/12.869500
Show Author Affiliations
Takayuki Nakano, Mitsubishi Electric Corp. (Japan)
Yoshihiro Matsumoto, Mitsubishi Electric Corp. (Japan)
Yasuhisa Tamagawa, Mitsubishi Electric Corp. (Japan)


Published in SPIE Proceedings Vol. 7652:
International Optical Design Conference 2010

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