| 摘要 |
<p>A reader for an optical card in which data are recorded along a plurality of tracks on an optical recording medium and optically detected by receiving the light that is emitted from a source of light and reflected by the optical recording medium, which comprises: a memory which records the levels of signals outputted from an optical detector; and a comparator which successively compares the level of an outputted signal stored in the memory with the level of a signal outputted from the optical detector obtained by the next scanning; wherein when the result of comparison indicates that the level outputted from the optical detector is higher than the output level read out of the memory, the content of the memory is replaced by the one that is on the higher level.</p> |
