ポリエステル/絹複合箏絃の設計と開発

摘要

筝（そう）は日本の伝統的な楽器である.この楽器には現在，絹絃とポリエステル絃が用いられている.演奏者らによれば絹絃は「弾きやすい」や「音響的に優れている」という長所をもつものの「破断しやすい」や「価格がポリエステル絃の3～5倍する」「温度による変化は少ないが，湿度による影響を受けやすい」などの問題もある.%So (Koto) is a traditional Japanese horizontal harp. Recently, for this music instrument, there are two types of strings made from silk and polyester filaments. The former is not only the strong points of tone and sound but also the weak point of durability and the latter has greater durability. In this research, we investigated how to produce novel silk so-string with good functionality. A composite so-string was designed with combining a silk so-string as core layer and a polyester filament yarn as sheath layer. And the durability and pleasant tone of composite so-string were examined. The following results were obtained:(1)the durability of the composite so-string was improved over 40 % in a comparison with the silk so-string; (2) The attenuation ratio of the composite so-string was better than that of the polyester so-string; (3) Additionally, the harmonic distribution of the composite string was nearly equal to that of the silk so-string.