Fiber optic face plate e.g. fiber optic cathode face plate, for image intensifying tube, has optical fibers with platings whose upper portions are filled with optically absorbing material which surrounds fiber core near light input surface

摘要

#CMT# #/CMT# The plate has a set of optical fibers, each with a tubular plating (21) surrounding a core (20) of the fiber, where the optical fiber core extends between light input and light output surfaces. The upper portion of each plating is filled with an optically absorbing material (40) e.g. optically absorbing polymer or metallic oxide, which surrounds the core adjacent to the input surface. The platings surround the core between an end of the material and the output surface. The plating is made of a different material. #CMT# : #/CMT# Independent claims are also included for the following: (1) a limitation device used as an optic fiber face plate for night vision goggle to limit the damages induced by a laser on the side under the vacuum of the plate (2) a contrast improving device for a fiber optic imaging device (3) a method for producing a fiber optic face plate. #CMT#USE : #/CMT# Fiber optic face plate e.g. fiber optic cathode face plate or fiber optic anode face plate, for an image intensifying tube of a night vision goggle to improve contrast (all claimed). #CMT#ADVANTAGE : #/CMT# The optically absorbing material of the tubular platings are efficient to absorb the laser radiation, thus improving the contrast of the image at the output surface of the plate and hence protecting the optical performances of the image intensifying tube and the night vision goggle. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a method for producing a fiber optic face plate e.g. fiber optic cathode face plate. 20 : Core 21 : Platings 40 : Optically absorbing material #CMT#CERAMICS AND GLASS : #/CMT# The platings can also be filled with an optically absorbing material e.g. spin-on absorber glass. #CMT#INORGANIC CHEMISTRY : #/CMT# The platings can also be filled with an optically absorbing material e.g. gallium arsenide, or optically absorbing metallic oxide e.g. zinc oxide.