Door phone unit

Abstract

Abstract PURPOSE:To reduce the sense of emptiness of the visitor and transfer business effectively, by operating a response circuit by call reporting visitation to not only report conditions such as absence to the visitor but also make it possible to record the object of the call, businesses, and so on of the visitor. CONSTITUTION:Response contents recorded previously in response circuit 4 are reported from speaker 5 to visitor 1 by call signal 3 dependent upon the operation of push button 2 of visitor 1. After absence or a reason not to receive him is reported by speaker 5, automatic switching circuit 6 is switched to record contents of the object of the call, businesses, and so on of visitor 1 on recording circuit 7 through microphone or speaker 5. Next, circuit 6 is automatically reset after a prescribed time to prepare for visitation. The receiver can confirm presence of visitors and contents of the message through receiver 10 of intercom main equipment 9 after return or completion of his business, and thus, the recording device of the automatic answering telephone and so on used for the telephone line is utilized effectively to constitute a door phone unit.

Inventors

• 👤 Koji Sakai

Bibliographic Details