| 摘要 |
PURPOSE: A door monitor is provided to observe, to watch visitors on the outside or circumstances easily at a long distance and to lower the cost of maintenance. CONSTITUTION: A door monitor (100) comprises; a condenser (10) which comprises a front inclined from the center vertically at a fixed angle, a top end illuminated to the outside, a center which condenses the incident light from the outside, a doorbell attached-lower end and a screw thread formed on the outer circumstance of a rear end; a fixed ring (30) coupled to a condenser (10) and fixed to an external surface of a door (1) with many projections (31); a body tube (40) which comprises one end screwed with a condenser (10), an end projection of a large diameter on another end, a screw thread formed throughout the outer circumstance and on the end projection; a coupling ring (33) screwed on the outside of a body tube (40) and fixed closely to a door (1) between fixed rings (30); an ocular (60) where the diffused light is gathered by connecting to the rear of a body tube (40); a fixed member (61) screwed to a body tube (40) where an end projection is formed to couple and to fasten an ocular (60) to a body tube (40); a control circuit (70) which controls the illumination of a condenser (10) and a doorbell; and a remote control (71) which regulates a control circuit (70) from distant.
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