Optical waveguides – With optical coupler – Input/output coupler
Patent
1994-10-07
1997-06-24
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
385120, G02B 636
Patent
active
056424493
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.
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Nashua Corporation
Nashua Photo Limited
Ullah Akm E.
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