| 摘要 |
FIELD: security devices. SUBSTANCE: device has secured door, which has peep hole with optical system. Infra-red code-modulated signal is sent by transmitter with encoding gate through beam, optical system and semitransparent mirror to photodetector. Then information is processed by decoder, which has two outputs. One output outputs signal when code is incorrect (code has been guessed), another output outputs signal when code is correct. Signal at first output switches alarm signal on. Signal at second output starts pulse generator, then light-emitting diode emits light which is transmitted through semitransparent mirror and optical system of door pipe- hole to outside of door. This means that code for permission of door lock has been sent. EFFECT: increased functional capabilities. |
