According to an embodiment, a charge-discharge control device includes a receiving unit and a group controller. Consequently, it is possible to easily obtain white light that has high color rendering properties. The seal opening device comprises a generally elongated and substantially planar blade wherein the distal portion of the blade forms a generally chevron configuration. A measuring part includes a laser head, a beam divider, and an interferometer installed at the operating path of the moving part forms the output into a displacement signal by receiving the input beam interference signal reflected by the X, Y bar mirror from receiver.