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Contents

   



(Top)
 


1 Preventing inside viewability  





2 References  














Peephole






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From Wikipedia, the free encyclopedia
 


View through a peephole
Barack Obama looking through the Oval Office door peephole
Door viewer in the gate of Vaxholm Fortress

Apeephole, peekhole, spyhole, doorhole, magic eye, magic mirrorordoor viewer is a small, round opening through a door from which a viewer on the inside of a dwelling may "peek" to see directly outside the door. The lenses are made and arranged in such a way that viewing is only possible in one direction. The opening is typically no larger than the diameter of a dime (0.7 inches, 18 mm).

In a door, usually for apartments or hotel rooms, a peephole enables to see outside without opening the door nor revealing one's presence. Glass peepholes are often fitted with a fisheye lens to allow a wider field of view from the inside.[1]

Preventing inside viewability

[edit]

Simple peepholes may allow people outside to see inside. A fisheye lens offers little visibility from the outside, but that can be defeated using a peephole reverser. Some peepholes have a shutter that falls down on the hole when nobody inside is holding it. Digital peepholes have a camera outside and an LCD screen inside, without any information going from the inside to the outside.

Another design to prevent people outside from seeing in involves the outside-facing lens projecting an image onto a semi-opaque frostedorground glass screen. An inside viewer can see the other side of the door from an arm's length away, rather than by peering through a small hole, while the frosted glass finish makes it impossible for someone to look through from the outside. There are drawbacks to the projection method: the area to be viewed must be well lit, and installation requires a much larger hole in the door than a traditional peephole.

References

[edit]
  1. ^ Peephole Is One Way Viewer, Popular Science, July 1950, p. 153, right-side.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Peephole&oldid=1219327627"

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This page was last edited on 17 April 2024, at 02:36 (UTC).

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