A new alignment device for the optical axes of porro prism binocular

In this paper we demonstrate a new alignment device in which we use the five parallel laser beams each set to rapidly and accurately align their corresponding optical axis of porro prism binocular (PPB). At all interpupillary distances (IPD), this technique assures parallelized right and left optics axis of PPB. In this method the left and right optical axis of a PPB are made parallel to each central beam of two “five parallel laser beams alignment devices” in the plane of incidence. And above process is assured by examining the direction of these five transmitted laser beams that transmitted through PPB in the way that the height and orientation of the PPB are fine tuned. The parallelism of the left and right optical axis of the PPB was measured by laser rangefinder. This novel method is used to obtain the parallelism of left and right optical axis of PPB in a maximum tolerance of three arc minute.