| abstract |
A crystal sensor (biosensor) comprises a slat like crystal plate (1) having a recess (2) for containing a medium of an object substance to be detected in a side face, a pair of exciting electrodes (3, 3) oppositely provided in the recess (2) and on the other side face respectively, lead-out electrodes (4, 4) for leading out the exciting electrodes (3, 3) to one edge of the crystal plate (1), and a reactive substance (5) that reacts with the object substance to be detected placed in the recess (2). With this, detection of the object substance is easy, and the cost is low. Especially, disposal after operation is easy, and the amount of waste is extremely small. |