| 摘要 |
A memory storing the frequency of using a laser beam printer is attached to a consumable part of the printer. Data indicating its expandable part is stored at the memory location of a specific address of the memory. When the consumable part is set to the laser beam printer, the data is read out of the memory. Emission of the laser beam is prohibited unless the data is read out. When the intended data is readout, control knows that the consumable part has been set to the printer. When the consumable part is properly set, it perfectly shuts off laser beams dangerous for an operator. Under this condition, emission of laser beams is permitted. In this way, the operator is protected from laser beams.
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