Device for reading or writing optical recording media

摘要

The present invention relates to a device for reading from and/or writing to optical recording media (6), which has a light source (1) for producing a scanning beam (2), a photodetector (7) for detecting the scanning beam (2) reflected by the recording medium (6) and a semi-transparent mirror (3) arranged in the beam path for directing the scanning beam (2) onto the recording medium (6) and the reflected scanning beam (2) onto the photodetector (7). <??>The object of the invention is to improve a device of this type, in particular also with regard to reducing the production costs. <??>This object is achieved by the semi-transparent mirror (3) being a plane-parallel plate with a layered structure, a partially reflective layer (10) being arranged between two small carrier plates (11, 12). <IMAGE>