| 摘要 |
PROBLEM TO BE SOLVED: To confirm an incoming call by visual sense by receiving generated radio wave, rectifying the radio wave by a diode and turning the diode on. SOLUTION: A pin 11 is a conductor and when it is shortly inserted in a jack, it is brought into contact with a grounding part outside the jack but prevented from being brought into contact with the other circuits of the jack. Antennas 2 consist of two antennas, an antenna 2a is brought into contact with the pin 11 and an antenna 2b is brought into contact with nowhere in a plug. An interval between the antennas 2a and 2b is a few centimeters and are tuned with used radio wave. A diode 3 is integrally formed by being connected with a light emitting diode 4 and a reed. The antenna 2b is connected with a contact of diodes 3c and 3d and the antenna 2a is connected to a control of diodes 3b and 3a. A positive side of the light emitting diode 4 is connected with a negative side of the diode 3a and a negative side of the light emitting diode 4 is connected with a positive side of the diode 3d. Since the radio wave is transmitted when the incoming call is received and a calling tone is uttered by the portable telephone the light emitting diode is turned on by receiving the radio wave. |
