The most fortified fortress will be vulnerable if it does not have information about what is happening outside. To get such information and install the eye on the drain. A long time as a prototype, the eye was just a rectangular hole in the door. And in the USSR, our grandfathers used mailboxes instead. The box was attached to each door and through it it was possible to see those on the landing.
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Modern door eyes are distinguished by the degree of review.
1. A peephole with a review of 120 degrees cheap and available, but it has unenvisable zones.
2. An eye with a review of 180 degrees allows you to completely see the entire space in front of the door.
The optical system of the door eye is quite complicated and is produced both from glass and from polymer materials. Plastic systems are much more economical, but glass transfers the image better.
The pipe for holding the eye in the canvas doors are made of metal or plastic. The service life of metal tubes is much higher.
The new invention in this area is an electronic eye. This is a complex system from a call, a liquid crystal screen, a multi -pixel camera. When clicking on the call button, the camera produces either a video recording or photographs and the image transfers to the screen.
A variety of structural solutions of the door eyes allows you to choose the right for any input group.