| 摘要 |
PURPOSE:To attain the display of external state by utilizing a peeping hole comprising a fish-eye lens attached to a door. CONSTITUTION:A lens of a television camera 3 or an incidence section such as image orthicon or the like is fitted to a position opposite to the fish-eye lens 2 of the door 1. since the output is coupled inductively to an antenna wire 6 or the like of a television receiver 5 indoor through a cable 4, the picture of a visitor is displayed indoor without giving notice. |
