Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-06-01
1993-12-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250228, H01J 516
Patent
active
052742288
ABSTRACT:
An improved linear light source or light collector for a film scanner comprising an elongated, cylindrical light integrating cylinder enclosed by first and second end walls and a longitudinal, cylindrical side wall, all having a diffusely-reflecting interior surface, the longitudinal side wall having a longitudinally extending outlet/inlet slit therein and an elongated light pipe, e.g. a glass rod, having a port at one end thereof for emitting light entering its input port (when used as a source) or for collecting light entering the slit (when used as a collector) in a preferred intensity profile varying along its length. The glass rod is mounted inside and parallel to the side wall of the cavity to direct light emitted laterally therefrom toward or to collect light reflected from the diffusely-reflecting interior surfaces. When used as a light source, a lens system directs the light from the light source into the end port of the glass rod. When used as a light collector, the light emitted from the end port is detected by a photodetector. The proferred intensity profile may be effected by a surface treatment of the glass rod comprises a coating of reflective paint applied in a lengthwise varying pattern that allows for tailoring the light reflected out of or into the glass rod along its length. A specular reflective mirror or a spaced-apart diffuse mirror may be positioned at the other end of the glass rod. In a further embodiment, the elongated glass rod is tapered from a first diameter at the outlet/inlet port to a point at the other end thereof in a taper that is tailored to control the intensity profile of light emitted or collected by the glass rod along its length. The end port is also preferably tapered to concentrate light and reduce the overall size of the linear light source/collector.
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Eastman Kodak Company
Nelms David C.
Woods David M.
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