The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 1976
Filed:
Dec. 02, 1974
Donald W Peterson, China Lake, CA (US);
Werner G Hueber, China Lake, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
An image attenuator having an attenuation range of over 100,000. An optical ens device focuses the image on a first liquid crystal layer which scatters the directed light only when an electrical potential is applied to the crystal layer by means of transparent electrodes, and in proportion to the strength of potential applied. A proportion of the scattered light is absorbed within a coherent fiber optic layer, the thickness and the spacing of the individual fibers of which can be varied to vary the contrast and attenuation of the system. Several stages may be stacked in series to obtain a greater degree of attenuation.