PROBLEM TO BE SOLVED: To provide a root part protection board for tree which includes an interference fringe pattern rich in variation like a moire pattern.SOLUTION: As a root part protection board for tree which is made of a cast iron product, a protection board body 11 has a plate upper part 14 positioned at an upper position and a plate lower part 15 positioned at a lower position, the plate upper part 14 and the plate lower part 15 severally have a large number of through-holes 16 and 17, the large number of through-holes are constituted by a steady pattern distribution, overlapping degree of the large number of through-holes which constitute the pattern distribution is made different to make interference fringes appear as a pattern.COPYRIGHT: (C)2015,JPO&INPIT【課題】モアレ模様のように変化に富んだ干渉縞模様を備えた樹木の根元保護盤を提供する。【解決手段】鋳鉄製品より成る樹木の根元保護盤として、保護盤本体11は上位に位置する板上部14と下位に位置する板下部15とを有し、板上部14と板下部15はそれぞれ多数の透孔16、17を有するとともに、上記多数の透孔は一定のパターン分布をもって構成し、上記パターン分布を構成する多数の透孔の重なり度合いが異なることによって干渉縞が模様として表れるように構成したことを特徴とする。【選択図】 図1
