Browse Prior Art Database

Humidity-Controlled Electrophotographic Process Developer

IP.com Disclosure Number: IPCOM000111533D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Lee, HC: AUTHOR [+3]

Abstract

The Figure shows a typical electrophotographic (EP) printing process with two-component developer mix. The printing cycle starts with the optical photo-conductor (OPC) belt 1 being erased by the erase lamp 2, cleaned by cleaner 3, and primed with uniform charge by corona charger 4. The images are then written at the writing head station 5 by a discharging process. Then, the OPC belt comes in contact with the toner-carrier mix 6 at the developer gap 7, and the toner is pulled off the carrier by the electric field in the gap 7. The toner is deposited on the OPC 1 to form a visible image as written at the writing head 5. The image is then transferred to paper 9 at the transfer station 18, and finally fixed at the fuser station (not shown).

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This is the abbreviated version, containing approximately 52% of the total text.

Humidity-Controlled Electrophotographic Process Developer

      The Figure shows a typical electrophotographic (EP) printing
process with two-component developer mix.  The printing cycle starts
with the optical photo-conductor (OPC) belt 1 being erased by the
erase lamp 2, cleaned by cleaner 3, and primed with uniform charge by
corona charger 4.  The images are then written at the writing head
station 5 by a discharging process.  Then, the OPC belt comes in
contact with the toner-carrier mix 6 at the developer gap 7, and the
toner is pulled off the carrier by the electric field in the gap 7.
The toner is deposited on the OPC 1 to form a visible image as
written at the writing head 5.  The image is then transferred to
paper 9 at the transfer station 18, and finally fixed at the fuser
station (not shown).

      For the two-component developer mix, the toner is held to the
carrier bead by electrostatic charge between the toner and bead.  For
given components, the holding force between the toner and bead is
strongly influenced by the electrostatic charge developed between
them.  Additionally, the amount of charge developed is affected by
the dryness or humidity of the mix.  Too high an electrostatic charge
impedes the deposit of toner onto the OPC and leads to light
printing.  Too low an electrostatic force (toner held loosely to
bead) results in overdevelopment, dusting and undesirable background
development.  Therefore, it is important to maintain the charge
development in the mix...