Accession Number : ADD000872

Title :   Method and Apparatus for Lens Mounting.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Costello,Owen T

Report Date : 12 Oct 1965

Pagination or Media Count : 2

Abstract : This patent relates to a method and apparatus for mounting a lens in a cylindrical holder and has for an object to produce a more nearly moistureproof mounting for an optical lens which is also free from the danger of fracture or clouding of the lens due to local unbalanced internal stresses within the lens. It has been discovered that by pressing the lens element against a yieldable moistureproof material and maintaining such a material always under pressure but below a pressure likely to fracture the lens, that best results so far have been obtainable. A lens may cloud due to unbalanced local stresses within the glass below a fracture stress, but these have now been kept from forming by a method and apparatus so simple that it is no longer necessary to subject a lens to a time consuming test with a polariscope to determine the presence of objectionable internal stresses and strains within a lens.

Descriptors :   *Optical lenses, *Mountings, *Patents, Waterproofing

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE