| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily compensate the variation of current transmission ratio in high accuracy to either or both of a transmission/reception route for signals with an optional modulation mode. <P>SOLUTION: One of controllers (46 and 49) of the photo couplers (22, D1, P2, 43; 27, D2, P1, 48) is integrally provided with an optical transmitter (22, D1) including light emitting elements (D1) such as a light emitting diode or the like, and an optical receiver (P2, 43) including an optical detector (P2) to receive optical signal output which the optical transmitter transmits according to the light emission of the light emitting element. Then, it emits a light at the maximum output and the minimum output from the light emitting element before the start of transmission of the optical signal output from the optical transmitter, and determines the amplification rate of the photo coupler on the basis of a difference between the maximum output and the minimum output. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
