| 摘要 |
PURPOSE:To reduce the coloration to a tone to be reproduced by reducing the thickness of a honey-comb core gradually to the outside. CONSTITUTION:The thickness of a honet-comb core 10 is reduced gradually to the outside thereof. Skin materials 11a and 11b are adhered to the both sides of the core 10. Thus, equivalent results can be obtained to those for the smaller vertical angle case because the strength of the inner peripheral portion of the cone is increased. |
