日本专利厅公开专利公报78—26111介绍了前原一夫发明的钢琴码子。这种钢琴码子的特点是,码身顺向开贯通孔,孔内穿金属丝一条,两端设置张紧机构。因此,通过调整金属丝的张力,可以使码子产生不同的内部应力,从而改变振动特性,达到改变音质的目的。右图中,左上角是传统的琴码,其余三 Japanese Patent Office Laid-Open Patent Publication No. 78-26111 describes the piano code invented by Maehara. The pianoforte is characterized by a straight body through the open yards, holes to wear a wire, set up at both ends of the tensioning mechanism. Therefore, by adjusting the tension of the wire, can make the code have different internal stress, thereby changing the vibration characteristics, to achieve the purpose of changing the sound quality. In the picture on the right, the upper left corner is the traditional piano code, and the remaining three