Wide-angle spyglass

Claim 1

A syglass to be mounted in a door or the like for providing a wide-angle outdoor view comprising in combination: an optical system including: a wide-angle lens of a relatively large diameter and having on one side thereof a convex surface of a relatively large radius of curvature and on another side thereof an opposing concave surface of a smaller radius of curvature than said convex surface for converging incoming light of substantially 180° outdoor sight at a large rate, an objective of smaller diameter than said lens and having a concave surface on a side thereof abutting coaxially against said other side of said lens containing said first-named concave surface, for collimating said converged light into a relatively small confined diameter, and an eyepiece of smaller diameter than said lens and having a convex surface disposed coaxially with said objective and spaced therefrom for magnifying said collimated light to provide a normal view of said substantially 180° outdoor sight, means for securing said lens, objective, and eyepiece relative to one another, said securing means comprising: a substantially cylindrical portion of smaller diameter than said lens for closely enclosing said collimated light of confined diameter and including a first end securing said objective and a second end spaced axially from said first end for securing said eyepiece, and an enlarged portion at the first end for securing said large diameter lens, means for mounting said securing means including the optical system to the door or the like presenting said magnified view to the interior of the door or the like, said mounting means comprising: a cylindrical member of smaller diameter than said lens and including one end attached to said second end of said cylindrical portion, and another end having a flange for engaging the door or the like so that one side of the door or the like is gripped by said enlarged portion and the other side of the door or the like is gripped by said flange.