Security viewer
OwnerWilliam D. Sherrardinventor
Life of this patent
Estimating the term…
Abstract
A security viewer to be mounted through a non-transparent partition, e.g. a door (7), comprises a housing (1) which extends through the door. The housing includes an inlet aperture (8), a screen (13) and a lens system (9, 10, 11, 12). The lens system forms a real image on the screen (13) of a field of view outside the door. Thus, an observer on the inside of the door can observe the real image without the need to place his eye against the viewer. The viewer is held in place by bezels (18, 19) which are glued in place on opposite sides of the door. The bezel (18) is slidable along the housing (1) to accommodate different door thicknesses.
Claims11
A security viewer to be mounted through a non-transparent partition, comprising a housing for extending through the partition, the housing including a cylindrical portion, an inlet aperture at one end of the cylindrical portion for collecting light from a first side of the partition, and a tapered portion at the other end of the cylindrical portion, a screen in the tapered portion for being observed from a second opposite side of the partition, lens means in the housing for forming from the collected light a real image on said screen of a field of view on the first side of the partition, whereby to render the field of view observable from the second side of the partition by observation of the screen, an outer bezel to be fitted onto said one end of the cylindrical housing portion to abut the partition on said first side thereof, the bezel forming an annular flange around the cylindrical housing portion, the outer bezel including an opening to be aligned with said inlet aperture, and a protective transparent member for spanning said opening, said screen having a symmetrical quadrilateral periphery with a diagonal dimension greater than the diameter of the cylindrical housing portion.
A security viewer to be mounted through a non-transparent partition, comprising a housing for extending through the partition, the housing including a cylindrical portion having at one end thereof an inlet aperture for collecting light from the first side of the partition, and at the other end thereof a tapered portion which houses a screen for being observed from a second opposite side of the partition, lens means in the housing for forming from the collected light a real image on the screen of the field of view on the first side of the partition, whereby to render said field of view observable from the second side of the partition by observation of the screen, an outer bezel to be fitted onto one end of said tubular housing portion to abut said partition on the first side thereof, and an inner bezel for being movably mounted on said tubular housing portion to abut the partition on the second side thereof, said screen having a symmetrical quadrilateral periphery with a diagonal dimension greater than the diameter of the tubular housing portion.
Dependencies are inferred from the claim text.