| 摘要 |
PURPOSE:To stop the action of a built-in circuit when an optical IC card is not used by providing a luminous energy modulator capable of adjusting a voltage detecting circuit and luminous energy by the prescribed time in terms of the optical IC card used by converting optical power into electric power. CONSTITUTION:A luminous source 2a supplies an optical power LP to the photodetecting part 1a of the optical IC card 1 by a white color lamp, etc. The luminous energy modulator 2a1 applies the hourly modulation to the luminous source 2a so that the optical power LP can be supplied during the prescribed period. Now the luminous energy modulator 2a1 is previously adjusted so that the optical electrostatic element 1a1 of the photodetecting part 1a can output a time width tau0, a vibration va-vb and the rectangular pulse voltage V0 of a period T. Inputting the voltage V0, the voltage detecting circuit 1a2 changes said voltage V0 to a voltage V1 at on-off levels of a logical element which is installed in the circuit and has a threshold vs. When a voltage V3 continues during a certain period with a t0 as a reference, a switch SW is turned on, and a microprocessor 1b1 becomes accessible to A RAM and a PROM. The card 1 will not act by a light beam from the sun, etc. |
