| 摘要 |
<p>A mark reader of the type comprising a light source (21), a light scanner (22), a plurality of mirror faces (23), read windows (13a, 13b) through which scanning light reflected from the mirror faces (23) is emitted and a light receiver (25) for receiving light reflected from a mark, such as a bar code. In operation, the reader generates a scanning pattern made up of a plurality of trajectories. The reader is switchable between different operational modes via a mode changer. In one operational mode, which is preferred for reading bar codes from menu sheets, a reading operation is only validated for marks which have been read with a particular one or ones of said scan trajectories. In a further operational mode, which is preferred for reading bar codes placed on articles, a reading operation is validated for all scan trajectories. The performance of either a conventional touch-system mark reader or a conventional remote mark reader can thus be achieved with a single unit. <IMAGE></p> |
