Patent ID: 8235695

Claim:
A pattern forming device for forming a predetermined pattern in a predetermined area of an elongated sheet material, the pattern forming device comprising: a tension applying device which applies a two-dimensional tension to a portion including the predetermined area of the sheet material, wherein the tension applying device includes a plurality of adsorbing-holding members which adsorbs a rear surface portion on the outside of the predetermined area of the sheet material, and wherein the plurality of adsorbing-holding members is provided in the periphery of a reference surface member so as to be relatively movable along a two-dimensional plane parallel to the reference surface member; an adsorption device which includes the reference surface member having a flat reference surface and allows the reference surface to adsorb a rear surface portion corresponding to the predetermined area of the sheet material applied with the two-dimensional tension; and an illumination device which illuminates an energy beam corresponding to the pattern to the predetermined area of the sheet material adsorbed to the reference surface.