LENS SHEET MANUFACTURING METHOD AND LENS SHEET MANUFACTURING DEVICE

摘要

A lens sheet manufacturing method according to one embodiment of the present invention comprises: a conveying step for conveying an original lens sheet (20), on the surface of which a large number of linear lens elements (3, S) are arranged and formed in parallel with each other; an edge line detection step for detecting the edge line of the lens element (S) formed on the original lens sheet (20); a determination step for determining whether or not the detected edge line and a cutting direction blade (26A) are in parallel with each other, the cutting direction blade (26A) being included in a punching-out blade (26) consisting of the cutting direction blade (26A) and another cutting direction blade (26B); a conveying direction modification step for, when it is determined in the determination step that the detected edge line and the cutting direction blade (26A) are not in parallel with each other, controlling the conveying direction of the original lens sheet (20) so that the detected edge line and the cutting direction blade (26A) become parallel with each other; and a punching-out step for temporarily stopping conveying of the original lens sheet (20) under the condition that the edge line of the lens element (S) and the cutting direction blade (26A) of the punching-out blade (26) are in parallel with each other and then punching out the original lens sheet (20) by the punching-out blade (26) to produce separated lens sheets (1).