Linear coated core/clad light source/collector
US5257340A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved linear light source or light collector for a film scanner comprising an elongated, solid, light integrating, light conducting rod having an axial port at one end thereof through which a light beam is introduced into or directed out of the rod and an output/input strip extending generally parallel to its longitudinal axis. The rod preferably comprises a core of transparent glass having a first index of refraction with a cladding layer covering the core, except in a first elongated strip, of a glass having a second index of refraction. A coating of diffusely reflective paint is applied over the cladding and the first elongated strip, except in a second elongated strip (which defines the output/input strip), wherein the first and second elongated strips do not overlap one another. When used as a linear light source, light directed axially into the port propagates axially down the core by internal reflection off the cladding/core interface, but is diffusely scattered at the coating/core interface of the first elongated strip and again scattered at the coating/cladding interface until the scattered light escapes through the output strip to provide a line of diffusely scatter…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.