Patent ID: 8258490

Claim:
An ultraviolet irradiation device for irradiating with ultraviolet rays an ultraviolet curable protective tape joined to a surface of a semiconductor wafer, comprising: a holding table to mount and hold the semiconductor wafer with the protective tape joined thereto; a drive mechanism to turn the holding table; ultraviolet light emitting diodes arranged at least in a radial direction of the semiconductor wafer; and a control unit to maintain a uniform accumulated quantity of light in an area of the protective tape where ultraviolet rays are applied upon irradiation of a surface of the protective tape with ultraviolet rays from the ultraviolet light emitting diodes while turning the holding table that places and mounts the semiconductor wafer with the protective tape joined thereto, wherein supply voltage is controlled such that ultraviolet intensity from the ultraviolet light emitting diodes increases outwardly of the semiconductor wafer.