Patent ID: 8596509

Claim:
A substrate alignment apparatus, comprising: a frame; a roller unit rotatably fixed to the frame to support a substrate, the roller unit includes a main roller, and at least one subsidiary roller disposed co-axially with the main roller, and the at least one subsidiary roller can move independently relative to the main roller to align the substrate; and variable devices between the main roller and the at least one subsidiary roller to move the at least one subsidiary roller relative to the main roller, wherein the variable devices include a first variable device configured to press the at least one subsidiary roller in a direction crossing a longitudinal direction of the main roller, and a second variable device configured to press the at least one subsidiary roller in the longitudinal direction of the main roller, wherein the first variable device includes a first pressure member connected to the main roller, a second pressure member connected to the at least one subsidiary roller, and a first variable member connecting the first pressure member and the second pressure member, wherein a length of the first variable member is adjustable in the direction crossing the longitudinal direction of the main roller, and wherein the first variable member includes a piezoelectric element.