Kyocera Corporation

Kazushi Kamiyama

Yuji Nakano

Tatuo Kobayashi

Hiroyuki Kinoshita

Satoru Tsubokura

Takashi Uto

Masato Fukudome

Shinji Inoue

A novel diarylethene photochromic compound is provided. The photochromic compound is capable of forming an amorphous thin film by itself through a coating method and has an excellent thermostability. The amorphous thin film of the photochromic compound can exhibit a large refractive index between the isomers of the photochromic compound. Thus, using such an amorphous thin film provides an optical function device suitable for an optical memory device and an optical switching device.

Photochromic compound and optical function device using the same

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.

Optical system for optical recording

A jewelling and ornamental material comprising many amorphous silica spheres regularly arranged in a three-dimensional array and a zirconium compound filled in pores existing among the amorphous silica spheres, the amount of the zirconium compound being 0.005 to 8% by weight, as zirconium, based on the entire material; and a process for its production. This material has a play of colors inherent to natural opal, and excellent durability.

Process for the production of jewelling and ornamental material

Jewelling and ornamental material and process for production thereof

Growing community of inventors

Uji, Japan

Kazushi Kamiyama