APPARATUS FOR THE PHOTO-OPTICAL READING OF MARKS AND PERFORATIONS ON RECORD MEDIA

摘要

Apparatus for optically reading record bearing media in which the sensitive elements are protected against dust and vapors, wherein the light transmitting end of the light source which illuminates the media and the light receiving end of the light collector which receives light from the media are enclosed in an airtight housing, and wherein light communication between the interior of the housing and the media is provided by a light conducting block in the wall of said housing.