PROBLEM TO BE SOLVED: To provide a genuine natural shell spoon capable of radiating the reflectance of a highly directive shell widely.SOLUTION: In a natural shell spoon of a curved plate shape recessed on the side of a rear face 3, the marginal part 5 of the side of the surface 4 of the spoon is formed into a flat slope face inclined toward the rear face, at an angle α of 5 to 45 degrees with respect to the adjoining surface 4.COPYRIGHT: (C)2016,JPO&INPIT【課題】指向性の強い貝の反射光を広く放射することができる無垢の天然貝スプーンを提供する。【解決手段】裏面3側が凹となる湾曲板状の天然貝スプーンにおいて、スプーンの表面4側の縁部5を、隣接する表面4に対し5~45度の角度αで裏面側に傾斜する平らな斜面に形成する。【選択図】図1
