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Proceedings Paper

The study about forming high-precision optical lens minimalized sinuous error structures for designed surface
Author(s): Yu Katahira; Masahiko Fukuta; Masahide Katsuki; Takeshi Momochi; Yoshihiro Yamamoto
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Paper Abstract

Recently, it has been required to improve qualities of aspherical lenses mounted on camera units. Optical lenses in highvolume production generally are applied with molding process using cemented carbide or Ni-P coated steel, which can be selected from lens material such as glass and plastic. Additionally it can be obtained high quality of the cut or ground surface on mold due to developments of different mold product technologies. As results, it can be less than 100nmPV as form-error and 1nmRa as surface roughness in molds. Furthermore it comes to need higher quality, not only formerror( PV) and surface roughness(Ra) but also other surface characteristics. For instance, it can be caused distorted shapes at imaging by middle spatial frequency undulations on the lens surface. In this study, we made focus on several types of sinuous structures, which can be classified into form errors for designed surface and deteriorate optical system performances. And it was obtained mold product processes minimalizing undulations on the surface. In the report, it was mentioned about the analyzing process by using PSD so as to evaluate micro undulations on the machined surface quantitatively. In addition, it was mentioned that the grinding process with circumferential velocity control was effective for large aperture lenses fabrication and could minimalize undulations appeared on outer area of the machined surface, and mentioned about the optical glass lens molding process by using the high precision press machine.

Paper Details

Date Published: 27 September 2016
PDF: 8 pages
Proc. SPIE 9949, Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials 2016, 99490A (27 September 2016); doi: 10.1117/12.2237436
Show Author Affiliations
Yu Katahira, Toshiba Machine Co., Ltd. (Japan)
Masahiko Fukuta, Toshiba Machine Co., Ltd. (Japan)
Masahide Katsuki, Toshiba Machine Co., Ltd. (Japan)
Takeshi Momochi, Toshiba Machine Co., Ltd. (Japan)
Yoshihiro Yamamoto, Toshiba Machine Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 9949:
Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials 2016
David H. Krevor; William S. Beich; Michael P. Schaub; Alan Symmons, Editor(s)

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