LIGHT GUIDING DEVICE AND METHOD

摘要

The present invention provides an instrument (40) adapted for alignment with a light beam (66), which instrument includes an instrument body (43) having a point of entry of the light beam, a light conducting channel, and a sensing element (25) carried by the instrument (40) and being spaced from the point of entry of the light beam (66). The sensing element (25) serves to provide indication of alignment between the instrument (40), and the light beam (66). The light beam (66) travels inside the instrument (40) along the channel to the sensing element (25). Light guiding devices are disposed inside the channel to increase precision of alignment. The light guiding device has a wall forming a guiding passage inside the guiding device. When disposed inside the instrument (40), the wall of the guiding device blocks non-aligned light beams from reaching the sensing element (25), while allowing the aligned light beams to propagate through the guiding passage inside the instrument (40) to the sensing element (25).