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Browse Prior Art Database

Toner Mass Development Control Using Vector Modification

IP.com Disclosure Number: IPCOM000099378D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Bonvallet, JC: AUTHOR [+2]

Abstract

Disclosed is a method of modifying the amount of toner mass development when toner patch sensing is used to control toner concentration in an electrophotographic machine. Using this method to modify toner mass development over the short term, while using toner patch sensing to control toner concentration over the long term, results in more consistent toner mass development (optical density) and more reliable machine performance.

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Toner Mass Development Control Using Vector Modification

       Disclosed is a method of modifying the amount of toner
mass development when toner patch sensing is used to control toner
concentration in an electrophotographic machine. Using this method to
modify toner mass development over the short term, while using toner
patch sensing to control toner concentration over the long term,
results in more consistent toner mass development (optical density)
and more reliable machine performance.

      Toner patch sensing is often used to control the toner
concentration of a dual component developer mix in
electrophotographic (EP) machines.  A toner patch is developed onto
the photoconductor surface, and the ratio of untoned-to-toned
photoconductor reflectance is compared to a desired control ratio in
order to select a toner replenishment rate for the developer mix.
Often, the toner patch ratio (and toner mass development) will be
higher or lower than desired due to normal interactions between the
EP system and the customer's usage of the machine.  Reliability of
some EP subsystems (such as the fusing station) may be reduced when
the toner mass is high.  Print quality may be reduced when toner mass
is high or low.  Therefore, it is desirable to modify the toner mass
development when the toner patch ratio is higher or lower than its
desired control point.  Toner concentration and development vector
are two parameters that affect toner mass development. Toner
concentration cannot be instantaneously changed, so the development
vector is changed to compensate for improper toner mass.  The
development vector can be modified proportionally to the deviation of
measured toner patch ratio from its desired control point.

      The developa...