Photocopying – Contact printing – Light boxes
Patent
1995-01-13
1996-07-02
Brase, Sandra L.
Photocopying
Contact printing
Light boxes
355200, 355208, G03G 2100
Patent
active
055328024
ABSTRACT:
A toner mass sensor includes a piezoelectric crystal having a resonant frequency, an electrode on a first face of the crystal, an electrically conductive lead connecting the first face of the crystal to an electrical contact point in the vicinity of a second side of the crystal, and a casing closed at one end by the crystal with the first face of the crystal allowed to contact developer outside of the closed casing through the opening of the casing. The casing and crystal defines an interior which is sealed from developer in a development station, within which sealed interior the second face of the crystal is protected from contamination by developer. The electrode is wrapped around the edge of the crystal to be accessible from the second side of the crystal, and the electrode is a metal; preferably aluminum. The interior of the casing is closed by a base member which carries an electrical circuit. The casing is cylindrical, and an elastomeric, electrical insulator gasket around the crystal seals the interior of the casing to inhibit contamination of the interior of the casing by developer.
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Almeter David D.
Potucek Martin
Rimai Donald S.
Sonnenberg Sven
Brase Sandra L.
Eastman Kodak Company
Sales Milton S.
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