| 摘要 |
PURPOSE:To facilitate manufacture and, simultaneously, to obtain an excellent acoustic characteristic by curving an original panel to be longitudinally and laterally cut in a prescribed curvature along the arranging direction of one part cut groove, thereafter, filling the one part cut groove with a resin, and solidifying it. CONSTITUTION:An original panel 36 is prepared in which full-face electrodes 32 and 34 are formed on both upper and lower surfaces of a piezoelectric substrate 30, and a plate separation-proofing plate 38 and a signal line 18 are fixed. The original panel 36 is cut in a prescribed pitch in the lateral direction, a total cut groove 4 in a depth up to the separation-proofing plate 38 is formed, the total cut groove 4 is filled with a resin 10, and it is solidified. Next, the original panel 36 is cut in the prescribed pitch in the longitudinal direction orthogonal to the arranging direction of the total cut groove 4, and the piezoelectric substrate 30 is left uncut. Then, the separation- proofing plate 38 is removed, the original panel 36 is placed on a supporting base 40 having a circular arc recessed surface 40a, and then, the original panel 36 is curved along the longitudinal direction. In such a case, a one part cut groove 6 is filled with the resin and solidified. The supporting base 40 is removed, and a full-face electrode 42 for grounding is provided on the upper surface of the original panel. |
