Other

Ricoh Company, Ltd.

Kyowa Yuka Co., Ltd.

Shiho Yamada

Hiroshi Toyoda

Ikuo Shimizu

Motoharu Kinugasa

Tatsuya Tomura

Tsutomu Satoh

Soh Noguchi

Yasunobu Ueno

Masanori Ikuta

Kenji Mutoh

Tsutomu Sato

Tohru Yashiro

Tomomi Ishimi

Noboru Sasa

Yasuhiro Higashi

Filters for electronic display device

An optical recording medium having a substrate, and a recording layer provided on the substrate and containing: (a) a formazan metal chelate including a formazan compound and a metal component, (b) a squarylium metal chelate including a squarylium compound and a metal component; and (c) at least one additional dye selected from phthalocyanine compounds and pentamethine cyanine compounds. Alternatively, the recording layer contains (a) a first formazan metal chelate including a first formazan compound and a first metal component and having the maximum absorption wavelength in the range of 500 to 650 nm, (b) a squarylium metal chelate including a squarylium compound and a metal component; and (c) a second formazan metal chelate including a second formazan compound and a second metal component and having the maximum absorption wavelength different from that of the first formazan metal chelate and in the range of 650 to 750 nm.

Optical recording medium, optical recording method and optical recording device

Metal complex type squarylium compounds and optical recording media made by using the same

An object of the present invention is to provide novel squarylium compounds having the spectroscopic properties, light resistance, solubility and thermal decomposition properties suitable for a recording material for DVD-R, and optical recording media using the same. More particularly, the present invention provides novel squarylium compounds represented by the general formula (I). In addition, the present invention provides optical recording media having a recording layer containing said squarylium compound.

Squarylium compounds and optical recording media using the same

Squarylium compounds having spectroscopic properties, light resistance, solubility and thermal decomposition properties suitable for a recording material for DVD-R represented by the general formula (I), having pyrazole and indoline skeletons in the molecule and optical recording media having a recording layer comprising an asymmetric squarylium compound of formula (I).

Squarylium compounds and optical recording medium containing the same

Optical recording medium and optical recording and reading method using the same

Growing community of inventors

Yokkaichi, Japan

Shiho Yamada