Abstract: A low reflectance reticle immersed in optical cement between transparent strates. A copper reticle is vacuum deposited upon one transparent substrate and chemically treated to produce anti-reflectance properties. The reticle and substrate to which it is attached are then cemented with optical cement to a second transparent substrate to immerse the anti-reflectance reticle between tranparent substrates in optical cement. The immersed reticle thus formed has superior anti-reflection properties and is protected from mechanical damage by its immersed location. Immersed reticles may be installed between elements of a compound lens if desired.
Type:
Grant
Filed:
February 6, 1978
Date of Patent:
December 11, 1979
Assignee:
The United States of America as represented by the Secretary of the Navy
Inventors:
Edwin M. Allen, William C. Fitzgerald, Henry Blazek, George Turner