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美国专利〔19〕(1977年12月6日发表)介绍了一种加音梁的弦乐器背板。专利说,这种改进了的结构最适用于六弦琴和小提琴类,也能应用于其它提琴类的弦乐器。这项设计能提高整个乐器的共鸣体和发音的音量,提高发挥演奏的优点和特性,演奏效果好,便于制造,便于制作中对共鸣箱、面板、背板之间的调节平衡,降低材料消耗。专利说,这项设计原则上是用带有音梁的均匀而平的背板来代替常用的拱形背板。这些音梁包括一个与共鸣箱纵向平行的主梁和上下两组位于主梁
U.S. Patent 19, issued December 6, 1977, describes a jamb girder backplate. The patent says that this improved structure is best suited for both violins and violins as well as other violins. This design can improve the volume of the resonance and pronunciation of the whole musical instrument, enhance the advantages and characteristics of playing performance, have good performance and are easy to manufacture, so as to balance the resonance box, the panel and the back plate during production and reduce the material consumption . The patent says the design essentially replaces the usual arched backplane with a uniform, flat backplane with sound beams. These sound beams include a main beam parallel to the longitudinal direction of the resonance box and two upper and lower beams located on the main beam