Photo Interrupter With connector. Dustproof, One side mounting. This Photo Switch-Dustproof Type (ALEPH) is suitable for Mimaki CJV300 printers. A Photointerrupter is a transmission-type photosensor, which typically consists of a light emitting elements and light receiving elements aligned facing each other in a single package, that works by detecting light blockage when a target object comes between both elements, acting as an optical switch.