Racket frame used in ball game e.g. hard type tennis, soft type tennis, has viscoelastic material embedded to fiber reinforced resin layer and having thickness ranging from 0.1 to 0.6 mm

摘要

The frame (1) has a viscoelastic material (9) embedded to a fiber reinforced resin layer (10) and having thickness ranging from 0.1 to 0.6 mm. A loss coefficient is equal or more than 1 on a frequency of 10 Hz and a temperature of 6 degrees Celsius.