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Proceedings Paper

Development of subwavelength structure coating (SWC) and its application to imaging lenses
Author(s): Takeharu Okuno
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Paper Abstract

Canon Inc. released the new EF 24mm f/1.4L II USM lens with a subwavelength structure coating (SWC), a new type of high performance anti-reflective coating, in December 2008. The subwavelength structure, which is made from microcrystalline alumina, can be formed on large, curved surfaces using a simple sol-gel process. Furthermore, by inserting a thin-film layer with an intermediate refractive index between the lens and the microcrystalline alumina, it is possible to achieve superior anti-reflection performance matching various lens refractive indexes. This report presents the principles and performance of SWC and describes the application of SWC to imaging lenses.

Paper Details

Date Published: 1 September 2010
PDF: 8 pages
Proc. SPIE 7652, International Optical Design Conference 2010, 765203 (1 September 2010); doi: 10.1117/12.868985
Show Author Affiliations
Takeharu Okuno, Canon Inc. (Japan)

Published in SPIE Proceedings Vol. 7652:
International Optical Design Conference 2010
Julie Bentley; Anurag Gupta; Richard N. Youngworth, Editor(s)

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