Patent ID: 6156220
Filing Date: 2000-12-05
Classification: G03F,H05K

Abstract:
A method for aligning a first film having a first aperture and a second film having a second aperture, the second film positioned below the first film, the method comprising the steps of:(a) shining light on the first film, the light being shone on a portion of the first film directly above the second aperture in the second film;(b) detecting a first amount of light traveling through the second aperture in the second film;(c) determining whether the first amount of light detected is equal to a second amount of light that would be detected if the first aperture were centered in vertical alignment over the second aperture; and(d) in response to the first amount of light not being equal to the second amount of light, shifting a horizontal position of the first film and repeating steps (a) through (c) until the first amount of light is substantially equal to the second amount of light.