Optical waveguides – Optical fiber waveguide with cladding – Utilizing multiple core or cladding
Patent
1992-06-01
1993-10-26
Healy, Brian
Optical waveguides
Optical fiber waveguide with cladding
Utilizing multiple core or cladding
385123, 385147, 385901, 362 32, 355228, 355229, G02B 602, F21V 704, G03G 1504
Patent
active
052573400
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 scattered light. The illumination profile (variation of illumination along the length of the output strip) can be custom tailored, rather than simply being uniform, by controlling the area and location of the portion(s) of the cladding that is disrupted to form the first elongated strip. For example, it can be designed to provide more light at the ends of the strip than at the center. When used as a linear light collector, light is directed at the elongated strip and, through internal reflection, is reflected in the reverse direction to the axial end port and a photodetector to detect the instantaneous intensity of the light beam entering the input strip.
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Eastman Kodak Company
Healy Brian
Woods David M.
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