| 摘要 |
PURPOSE:To visually and auditorily obtain a satisfactory feeling by superposing a doubling plate on the reverse side of a decorative sheet, superposing a foam resin sheet on a rigidity frame in parallel to the doubling plate, and attaching a driver unit formed by a piezoelectric ceramic plate and a metallic diaphragm to this foam resin sheet. CONSTITUTION:A picture 19, etc., are sandwiched between a doubling plate 17 by a foam resin sheet and a transparent sheet 18 is parallel to the foam resin sheet 11 fixed to a rigidity frame, and also, at a void, superposed on the rigidity frame and contained in a decorative edge 10. When a sound signal voltage is applied to a driver unit 20 constituted of a metallic diaphragm 21 and a piezoelectric ceramic plate 22, generated vibration is propagated to the whole foam resin sheet 11 through a spacer fixed to the whole peripheral edge of the metalic diaphragm 21 and air in a closed space 24, it becomes a diaphragm and a reproducing sound is radiated. In such a way, the beauty of sound can be superposed on the beauty of picture, etc., and the sense of an appreciator can be satisfied. |
