| 摘要 |
An ink tank detachably mounted on a printer includes a non-volatile memory and a LED for executing a process in response to a condition of the tank such as ink residual quantity by transmitting information stored in the memory to a printer, and informing the condition of the ink by use of the LED. Further, the content stored in the memory is prevented from being destroyed, and the LED can perform light emission until immediately before detachment and thus contribute to improvement in workability of a user. A volatile memory element is provided in addition to the non-volatile memory. When a user can detach the tank, condition information on the ink tank retained by the non-volatile memory is transferred to the volatile memory in advance. When it is possible to detach the tank, control for turning the LED on and off is achieved by accessing only to the volatile memory.
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