| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a three-dimensional semiconductor element to be used for detecting the type of ink housed in an ink tank, etc. SOLUTION: The three-dimensional semiconductor element 31, arranged in the ink tank (not shown) has an energy-converting means 34 for transducing an electromotive force 32, which is the energy from the outside A, into electric power 33, which is a different type of energy and a light emitting means 35 for emitting light by the electric power 33 created by the energy transducing means 34.</p> |
