Optical: systems and elements – Lens – Including a nonspherical surface
Patent
1998-11-16
2000-03-28
Sugarman, Scott J.
Optical: systems and elements
Lens
Including a nonspherical surface
359245, G02B 302
Patent
active
060439408
ABSTRACT:
A hemispheric lens of a single crystal having a refractive index of 2.0 or over is used as a SIL lens of an optical system for optical recording. The single crystal is LiNbO3, LiTaO3, rutile phase TiO2, PbMoO4, TeO2, SrTiO3, ZrO2, SrNbO3, SrTaO3, CaNbO3, CaTaO3, CaTiO3, KNbO3, KTaO3, BaZrO3, SrZrO3, CaZrO3, KNbO3, KTaO3, BaZrO3, SrZrO3, CaZrO3, ZnWO4, ZnMoO4, CdWO4, CdMoO4, PbWO4, Bi20SiO12, Bi20GeO12, Bi4Si3O12, Bi4Ge3O12, GaP, ZnTe, ZnSe, Cu3TaSe4 or ZnS.
REFERENCES:
patent: 4753521 (1988-06-01), Deserno
patent: 5125750 (1992-06-01), Corle et al.
Inoue Shinji
Kamiyama Kazushi
Kinoshita Hiroyuki
Tsubokura Satoru
Uto Takashi
Kyocera Corporation
Lee Younggil Timothy
Sugarman Scott J.
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