| 摘要 |
PROBLEM TO BE SOLVED: To provide the optical call display device for a telephone set by which the arrival of an incoming call is easily visually recognized from a remote location. SOLUTION: The call display device is provided with a light transmission section 2 collecting and emitting a light from a telephone set light emitting section 14 emitting a light when receiving the arrival of an incoming call via a condenser lens 21, a condenser lens 31 receiving the light emitted from the light transmission section 2, a photo transistor 36 receiving the light focused by the condenser lens 31 and converting it into an electric signal, an amplifier circuit amplifying the electric signal, a display lamp 38, a drive circuit driving the display lamp 38, and a light receiving display section 3 that is fitted to an upper part of a telephone set 1. |
