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Diffusing Mirror Total Internal Reflection Illuminator

IP.com Disclosure Number: IPCOM000094837D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Jueneman, RR: AUTHOR

Abstract

In light conductors, escape of light from the sides results in reduced transmission efficiency and poor image contrast when the conductors are bundled. This conductor 10 comprises core 1, cladding 2 and reflective coating 3. The refractive index of cladding 2 is less than that of core 1. Both media are transparent to the wavelength or wavelengths being transmitted. Reflective coating 3 comprises silver or aluminum or other suitable material.

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Diffusing Mirror Total Internal Reflection Illuminator

In light conductors, escape of light from the sides results in reduced transmission efficiency and poor image contrast when the conductors are bundled. This conductor 10 comprises core 1, cladding 2 and reflective coating
3. The refractive index of cladding 2 is less than that of core 1. Both media are transparent to the wavelength or wavelengths being transmitted. Reflective coating 3 comprises silver or aluminum or other suitable material.

A critical angle 8 exists at interface 4 and is a function of the refractive indices of core 1 and cladding 2. Angle 8 is defined as the smallest angle of incidence in core 1 for which light is totally reflecting from interface 4. The latter is substantially free of imperfections of the order of transmitted wavelengths. Surface 5 has such imperfections.

Conductor 10 utilizes diffuse reflection, rather than specular deflection, thus facilitating refraction of a portion of diffusely reflected energy into core 1 at an angle greater than angle 0. Non-axial light rays such as 17 striking interface 4 at greater than angle 0 are internally reflected. However, ray 11 at angle a less than 0 is partially reflected as ray 12 and partially refracted as ray 13. Ray 13 is diffusely reflected at surface 5. Refracted ray 17 results from reflected ray 16 and is at an angle greater than 0. This ray is recaptured by core 1 and no loss of light energy occurs. Refracted ray 15 results from re...