Correctly selected door eye - protection of the apartment from intruders
It's unpleasant when you call at your door, and youabsolutely not in the know who is on her side. You can call yourself anything, introduce yourself - anyone. The voice can be faked. Only with my own eyes, seeing the otherworldly visitor, you can open the door. In the Middle Ages, there was an observation slot for this, like a loophole. Today - the peephole. However, the eye of the eye is a big strife.
First of all, it is necessary to determine the angle of vieweye. If it is not enough, one of the intruders can simply sit down - and now it's not visible, and the second one rings at the door, with a "person who inspires confidence" (two unfamiliar men at the door are always suspicious than one).
Therefore, the optimal viewing angle of the door eyebegins with 180 degrees. Security experts advise choosing 200 degrees - due to the fact that at the edges of the view, this angle gives less distortion. In this case, it will be possible to consider the entire visitor, up to the shoes on his feet.
The material from which the peephole is made,too, is of no small importance. Immediately and forever goodbye to plastic: cheap, but inefficient. Electrified plastic, like a magnet, attracts dust to itself, and after a while, the optical properties of plastic slowly but inevitably deteriorate. It is better to put once, but "for centuries". Then pay attention to the union of metal and glass, optical or spectacled. Only the metal must have a coating, so as not to darken with time.
Another important security detail related to thethe door-shutter, which covers it from the inside. The fact is that the peephole itself is able to give out to the criminal, at home the owners or not, by changing the lighting in his lens. However, if you first bring your face closer to the eyepiece and then open the curtain, the lens that is located outside will remain dark. For effective operation, the shutter must close the eyepiece cover tightly, and not open a sound when opening it.
Of course, there can not be any kind of noiselessnessspeech if the child remains at home. After all, in order to look at the door peephole, he first needs to bring in a hallway chair, and then climb it. The problem is solved by a more complex, but also a safe device of the periscope type. In this case, the ocular eyelet is located at the level of child growth.
The last of the opticaloptions, the most suitable for both adults and children, - the peephole is a panoramic door. The eyepiece is replaced with a frosted glass, which, as on the screen, is projected the entire surveyed area in front of the door. The image on the screen is perfectly visible from 1.5-2 meters.
Approximately from the middle of 90th years of the last century inRussia began to actively distribute electronic devices, which previously installed only on protected sites. They made it unnecessary to go into the hallway on the doorbell. In fact, if the digital camera is looking at the peephole, just look at the computer screen to which it is connected. Or the camera can be generally located on the landing to look at it all (and not one if desired). And if you add an infrared lamp, then a twisted light bulb for criminals will not help. Added microphones and speakers will allow you to negotiate with the visitor / s, without departing again from the computer, with which you can also videotape in any case to conduct ...
In doing so, however, do not forget that the stairwell is a common use area, and it is illegal to keep a hidden picture on it.