| 摘要 |
<p>PURPOSE: To avoid the wearing of a metal contact without damaging the minimum size of a device and to protect a circuit function in a detachable device by providing a photocoupler with which optical signals are exchanged between two devices proximating the detachable device and a main body device each other. CONSTITUTION: A smart card is inserted into or onto a main body device 20 and housed proximately to a collimation position 26 of the main body device 20. A modulated infrared signal radiated from the collimation position 26 is received by the smart card and in response to the received infrared signal, a photoelectric power generator 12 derives a voltage signal. This voltage signal has a so-called DC level and is received by a microcontroller 19 inside a board 13 after the amplitude is modulated by digital data first sent to an input terminal 22 of the main body device 20, and demodulated and power and a digital signal can be provided. Thus, data transfer is performed between the main body device 20 and the microcontroller 19.</p> |
