PROBLEM TO BE SOLVED: To provide a plant cultivation apparatus capable of uniformizing photon flux density emitted on the entire cultivation area while using a minimum necessary number of LED packages.SOLUTION: A plant cultivation apparatus comprises a rectangular parallelepiped cultivation unit 10 surrounded by six virtual walls 11 to 16. A cultivation area 17 where plants are arranged is provided for the lower virtual wall 12 of each cultivation unit 10, and LED illumination devices are arranged above the lower virtual wall 12 with a gap between them. A plate-shaped reflection member whose one surface is a reflection surface is arranged in an area facing the inside of the cultivation unit 10 of at least two virtual walls which are parallel with each other out of the six virtual walls 11 to 16 in the cultivation unit 10 such that the reflection surface faces the inside of the cultivation unit 10. A plurality of concave surfaces which are recessed outside of the cultivation unit 10 and in which openings face the inside of the cultivation unit 10 are formed on the reflection surface of the reflection member facing the inside of the cultivation unit 10. The concave surface consists of at least either one out of a partially cylindrical surface and a partially spherical surface.COPYRIGHT: (C)2015,JPO&INPIT【課題】必要最少数のLEDパッケージを使用した上で、栽培領域全体に発せられる光量子束密度を均一化しうる植物栽培装置を提供する。【解決手段】植物栽培装置は、6つの仮想壁11~16で囲まれた直方体状の栽培ユニット10を備えている。各栽培ユニット10の下仮想壁12に植物が配置される栽培領域17を設け、下仮想壁12の上方に間隔をおいてLED照明装置を配置する。栽培ユニット10における6つの仮想壁11~16のうち少なくとも互いに平行な2つの仮想壁の栽培ユニット10内側を向いた部分に、片面が反射面となっている板状の反射部材を、反射面が栽培ユニット10内側を向くように配置する。反射部材の栽培ユニット10内側を向いた反射面に、栽培ユニット10外側に凹みかつ開口が栽培ユニット10内側を向いた複数の凹面を形成する。凹面は、部分円筒面および部分球面のうち少なくともいずれか一方からなる。【選択図】図3
