An observation port assembly, arranged to be attached to a door and to permit a panoramic view with a maximum field of view of the area outside the door, including a boxshaped part, attachable to the outside surface of the door, having at least two optical viewing elements with wide angle properties arranged with the viewing oculars adjacent to each other and viewable from the inside of the door, the optical axis of said elements being arranged in a predetermined angle relationship between to adjacently arranged elements.

A viewing device for mounting in a wall or door frame to provide a view of the exterior of the building to an occupant of the building comprises a tubular housing and a pair of reflectors mounted by arms at one axial end of the housing so that they extend axially outward from the housing. The device further includes a transparent view housing which encloses the reflectors and prevents rearrangement of the reflectors while at the same time permitting a clear view of the area directly in front of the housing. The interior end of the tubular housing is enclosed by an eyepiece which can preferably be a magnifying type lens to increase the size of the images reflected from the reflectors and perceived through the transparent view housing.

A security viewing device which provides a viewer on one side of a door with a view of a caller whether he is standing directly outside the door or concealing himself to one side. The device includes a housing in which is mounted a stationary rotating periscope having an eye piece for the user at one end. The opposite end of the periscope is provided with two viewing ports facing in axial and radial directions. An inclined one way reflecting surface is mounted in the periscope adjacent the radial viewing port. The periscope with the two viewing ports end is enclosed in a clear plastic bubble with a portion of its top (northern) inner side darkened in opaque black. When the radial port is positioned upward or facing north, the user looks straight ahead through the one way reflecting surface and the axial viewing port at the caller. If the caller has stepped to one side, the periscope is rotated clockwise or counter clockwise until the radial viewing port clears the darkened area of the bubble so that the caller may be seen through the radial viewing port via his reflection in the inclined mirror.

The present invention provides a viewing device, said device being positioned within the outer and inner surfaces of an entry door, to ascertain the identity of prospective entrants from within the confines of a dewlling. The device includes on the outer surface of the door a turret wherein at least four ports retain a like series of wide angles lenses. One of said ports and its lens is situated axially along a line from the eyepiece for straight ahead viewing, while the three ports and complimentary lenses are situated radially at right angles in relation to said axial port so as to give complete views of the area below and to the right and left of the doorway. A mirror, being positioned by a cam means, transmits the light and hence the image from each port to the user within the dwelling. By repositioning the mirror, the user may ascertain the presence and identity of visitors within a complete one hundred eighty degree field before the door.

A door viewer includes two prisms of rectangular isosceles triangle shape in cross section whose hypotenuse surfaces abut horizontally, a front convex lens, an intermediate plano-convex lens and a plano-convex eyepiece lens. The front convex lens has a front concave surface and a rear convex surface to correct chromatic aberration. The convex surfaces of the intermediate and eyepiece lenses are positioned face to face with each other to correct barrel distortion. The view casts an image onto a ground glass screen formed on or provided abutting the eyepiece lens.