Title:
2-WIRE TYPE VIDEO PHONE SYSTEM CAPABLE OF OPENING DOOR THROUGH DOORPHONE
Document Type and Number:
WIPO Patent Application WO/2016/093675
Kind Code:
A3
Abstract:
The present invention relates to a 2-wire type video phone system comprising: a door-opening voltage control unit provided on the front end of a first connection terminal to which a communication line is connected in a video phone, so as to enable polarities of driving power sources outputted to the first connection terminal to be respectively converted into opposite polarities and outputted when a call signal is transmitted to and received from the communication line and when a doorlock is released; a first switching element connected between a second connection terminal, to which the communication line is connected in a door phone, and a load comprising the door phone, so as to supply a driving voltage to the door phone by being connected in an on state by a driving power source received from the video phone when the call signal is transmitted and received; a third connection terminal provided inside the door phone, and connected to the second connection terminal by an internal wire so as to be connected, in parallel, to the 2-wired communication line; a second switching element connected between the third connection terminal and the door lock so as to supply a doorlock release voltage by being connected in an on state by a driving power source received from the video phone when the doorlock is released; and the doorlock connected to an output side of the second switching element.
Inventors:
LEE JONG KYU (KR)
RYOU HYO CHOONG (KR)
RYOU HYO CHOONG (KR)
Application Number:
PCT/KR2015/013634
Publication Date:
August 04, 2016
Filing Date:
December 11, 2015
Export Citation:
Assignee:
KYUNG DONG ONE CORP (KR)
International Classes:
H04M9/00
Foreign References:
| JP2012119746A | 2012-06-21 | |||
| KR19990065991A | 1999-08-16 | |||
| KR20090052489A | 2009-05-26 | |||
| KR20120048931A | 2012-05-16 | |||
| US4712103A | 1987-12-08 |
Attorney, Agent or Firm:
CHO, Chul Hyun (#1301 123, Teheran-ro,Gangnam-gu, Seoul, KR)
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