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:
Jun. 24, 1997
Filed:
Oct. 07, 1994
Nicholas John Phillips, Loughborough, GB;
Nashua Corporation, Nashua, NH (US);
Nashua Photo Limited, Devon, GB;
Abstract
An image display arrangement comprising a collimating fibre-optic plate arranged to be illuminated from one side, for example a fibre optic plate forming the screen of a c.r.t. display tube and coated with a phosphor for providing such light, has, on at least one side thereof a layer of a photopolymer having formed therein an array of integral graded refractive index lenses, each extending over and in register with the end face, adjoining the photopolymer layer, of a respective optic fibre of the fibre optic plate. Each said graded refractive index lens is of a power such as to enhance the collimating effect of the respective optic fibre. A diffusion layer is preferably superimposed on the photopolymer layer, to impart a controlled diffusion to light passing through the optical fibres and said photopolymer layer, such as to render invisible or less visible the regions, in the fibre-optic plate, between adjoining optical fibres. The invention thus reduces or eliminates the so-called 'chicken wire' effect.