Electrophotographic developing system comprising toner having specific particle size distribution
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United States of America Patent
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Nov 5, 1991
Issued Date -
N/A
app pub date -
Feb 25, 1991
filing date -
Oct 31, 1985
priority date (Note) -
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status (Latency Note)
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Abstract
A developing system for an electrostatic image reproduction machine comprising a mono-component developer having toner particles of selected diameters dispersed therein; container for holding the developer; a developer sleeve for receiving a quantity of the developer from the container; a restriction member for forming a thin layer of the developer on the sleeve; a device for impacting an electric charge to the developer layer; and a latent image retainer for selectively receiving the electrically charged layer for forming a visible image. The developer satisfies the expression d.sub.75 /d.sub.25 .ltoreq.d.sub.50 /40+1.2 where d.sub.25, d.sub.50 and d.sub.75 represent diameters of toner particles when the percentage by volume or by weight of toner particles of that diameter as compared to the total volume or weight of the developer is 25%, 50% and 75%, respectively. A developer and method for making the developer are also described.
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