Patent ID: 7014287

Claim:
A solid semiconductor element in a spherical shape in contact with liquid comprising: receiving and energy converting means for receiving a signal of an electromagnetic wave from the outside of said solid semiconductor element in a non-contact manner, and converting the electromagnetic wave to a power by electromagnetic induction; information acquiring means for acquiring outside environmental information concerning the liquid; information storing means for storing information to be compared with the information acquired by said information acquiring means; discrimination means for comparing the information acquired by said information acquiring means with the corresponding information stored in said information storing means, and discriminating a need for information transmission when the signal of the electromagnetic wave received by said receiving and energy converting means satisfies a predetermined response condition; information communicating means for displaying or transmitting the information acquired by said information acquiring means to the outside of said solid semiconductor element when said discrimination means discriminates the need for the information transmission, and a hollow portion for floating on a liquid surface or in a predetermined position in the liquid; wherein said information acquiring means, said information storing means, said discrimination means, and said information communicating means are operated by the power converted by said receiving and energy converting means, said receiving and energy converting means being provided with an oscillating circuit having an electric conductor coil generating electricity with an external resonance circuit in the outside; and wherein, to control magnetic flux stably between the oscillating circuit and the external resonance circuit in the outside so as to stabilize a direction of said solid semiconductor element with respect to said external resonance circuit, said information acquiring means and said information communicating means are arranged to satisfy the following relations; a center of gravity of said solid semiconductor element is positioned below the center of said solid semiconductor element in a gravity direction; a buoyant force of said solid semiconductor element is equal to the weight of said solid semiconductor element; and a line of action of said buoyant force passing through said center of gravity and a line of action of weight passing through said center of gravity coincide with each other.