Apparatus for reading from and/or writing to optical recording media

摘要

The present invention relates to an apparatus for reading from and/or writing to optical recording media having a scanner (1) for scanning the recording medium, a coarse drive (5) for moving the scanner (1) relative to the recording medium and a measuring device for determining the travel of the scanner (1). The object of the present invention is to propose an apparatus of this type in which it is possible to determine the position of the scanner as exactly as possible, the intention being for this to be ensured even in the event of a high movement speed or acceleration. This is achieved according to the invention by virtue of the fact that the measuring device has an optical interference generating means (17) and an optical interference detection means (21). The invention is particularly advantageous for apparatuses which require rapid access to extremely diverse locations on the recording medium, as is the case with apparatuses appertaining to optical data storage, for example CD-ROM or DVD-ROM apparatuses.