Patent ID: 7091499

Claim:
An ultraviolet irradiating method for emitting ultraviolet light toward a work piece and a frame holding said work piece through an ultraviolet sensitive adhesive tape applied to a back surface of the work piece, said method comprising: a step of placing a regulating member separate from the adhesive tape applied to the back surface of the work piece, with a predetermined clap downward from a back surface of the adhesive tape prior to emitting ultraviolet light; a step of emitting ultraviolet light to said work piece; and a step of stopping, with said regulating member, the adhesive tape and the work piece closing said clap formed between the back surface of the adhesive tape and the regulating member and falling as a result of the adhesive tape softening and slackening under influence of heat, and the adhesive tape and the work piece falling together under weight of the work piece, in the step of emitting ultraviolet light.