Patent ID: 7337819

Claim:
An alignment device for fabricating an optical disc, in which the center of a cover sheet and the center of a disc shaped disc substrate are aligned with each other when the optical disc is fabricated with the disc substrate having a circular center hole bored at the center thereof and the cover sheet having a circular opening greater in diameter than the center hole bored in the center of the disc substrate and the cover sheet being stuck to the disc substrate so as to form a transparent cover layer, the device comprising: a support table having a flat placing surface, on which the cover sheet is placed; a center pin disposed at the support table in such a manner as to project upward of the placing surface, the center pin including a disc supporting portion for supporting a peripheral edge of the center hole bored in the disc substrate at an intermediate portion in a height direction, a disc inserting portion to be inserted into the center hole bored in the disc substrate placed on the disc supporting portion at an upper end of the disc supporting portion, and a sheet inserting portion to be inserted into the opening bored in the cover sheet placed on the placing surface at a lower end of the disc supporting portion; an alignment lever disposed at the center pin in such a manner as to extend between the upper end of the disc inserting portion and the lower end of the sheet inserting portion, the lever being swingably supported by the center pin about a strut disposed at an intermediate portion between a disc urging portion disposed at the upper end of the alignment lever and a sheet urging portion disposed at the lower end of the alignment lever; and an urging member for urging the alignment lever such that the disc urging portion is pushed out toward an outer periphery along the swing direction of the alignment lever and the sheet urging portion is pushed in toward the inner periphery; wherein when the disc substrate is lowered from the tip of the disc inserting portion down to the disc supporting portion the disc urging portion is pressed by an inner peripheral surface of the disc substrate, to be thus pushed in toward the inner periphery and the sheet urging portion is pushed out toward the outer periphery, so as to press the inner peripheral surface of the cover sheet on the placing surface in association with descent so that the alignment lever urges both of the cover sheet and the disc substrate in the same alignment direction.