Patent ID: 7222432
Filing Date: 2007-05-29
Classification: F41G,Y10T

Abstract:
1. A method of assembling a dual reticle module comprising a first element and a second element, wherein the first element has a first reticle and the second element has a second reticle, the method comprising the steps of: providing a screen and a collimated light beam, wherein the screen is disposed along the path of the collimated light beam; disposing the first element and the second element between the screen and the collimated light beam so that a projected image of the first reticle and the second reticle are formed on the screen, wherein the collimated light beam is set in a direction perpendicular to the first reticle and the second reticle; adjusting the relative position of the first element and the second element so that the projected image of the first reticle overlaps with the projected image of the second reticle on the screen; and fixing the relative position between the first element and the second element as the projected images of first and the second reticles are overlapped together.