Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1996-03-04
1997-04-01
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250574, 250576, 250577, 250903, 347 7, G01N 1506, G01N 2149, G01N 2185
Patent
active
056169299
ABSTRACT:
An inexpensive ink tank having an ink remaining amount detection section which can be used with ink of any color is disclosed. An optical ink detection section formed from a light transmitting material has an inclined interface and is formed integrally with the ink tank. Incident light from a light source is refracted, when ink is present in the ink tank, at the interface to make refraction light and does not emerge to a visual observation portion. When no ink is present, the incident light is totally reflected by the interface to make total reflection light, which can be visually observed at the visual observation portion. A roughened face is formed at the visual observation portion so that light emerging to the visual observation portion may be scattered to facilitate visual observation.
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Allen Stephone
Fuji 'Xerox Co., Ltd.
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