DEVELOPER CONTAINER UNIT, DEVELOPING UNIT, AND PROCESS CARTRIDGE
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United States of America Patent
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app pub date -
Dec 23, 2013
filing date -
Dec 27, 2012
priority date (Note) -
Abandoned
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Abstract
A developer container unit includes a container containing developer and a piezoelectric film for detecting an amount of developer in the container. A sensitivity of the piezoelectric film to a stress in a direction parallel to a film surface is greater than a sensitivity of the piezoelectric film to a stress in a direction perpendicular to the film surface, and the piezoelectric film is deformable with a movement thereof relative to the developer.
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