Solid semiconductor element, ink tank, ink jet recording apparatus provided with ink tank, liquid information acquiring method and liquid physical property change discriminating method

An ink jet recording system including a plurality of ink jet heads for performing color recording with an ink jet printer, recording being made with a plurality of ink tanks being mounted to the ink jet heads, each of the ink tanks storing ink to be discharged corresponding to each of ink jet heads,

• wherein a solid semiconductor element is arranged in each of said plurality of ink tanks in a floated state on an ink liquid surface or in the liquid,
• wherein the ink jet printer further includes a common antenna for performing wireless communication by electromagnetic wave commonly with all of the solid semiconductor elements arranged in all of the plurality of ink tanks,
• wherein each of the solid semiconductor elements includes receiving and energy converting means having a coil which receives a signal of the electromagnetic wave from said antenna in a non contact manner and which converts the electromagnetic wave into electric power by electromagnetic induction, information acquiring means for acquiring information as to at least an ink remaining amount in the ink tanks in which the solid semiconductor elements are arranged, information storing means for storing information, discrimination means for comparing information with information stored in said information storing means, and information transmitting means for transmitting information,
• wherein each of said plurality of solid semiconductor elements has a discrimination ID different from each other, and wherein said antenna transmits a discrimination ID,
• wherein only the solid semiconductor element having a discrimination ID corresponding to the discrimination ID transmitted by said antenna receives information subsequent to transmission of the discrimination ID by said antenna, and wherein said discriminated solid semiconductor element acquires by said information acquiring means information as to at least an ink remaining amount in the ink tank where the solid semiconductor element is arranged, compares by said discrimination means said acquired information with the information of said storing information means to discriminate whether a transmission is needed, and transmits by said information transmitting means to outside of the ink tank in a case where the need for information transmission is discriminated.