Developing device
AssigneeCanon Kabushiki Kaisha
InventorShinya Suzuki
Life of this patent
Estimating the term…
Abstract
A developing device includes a rotatable developer carrying member, first and second chambers, a first rotatable feeding member, a second rotatable feeding member, a first communication port, a second communication port, and a toner content detecting portion including a planar detecting surface including at least a planar coil. The detecting surface is provided in a region of the first communication port sandwiched between rotational axes of the first and second rotatable feeding members and is disposed at a position such that the developer is fed toward both sides of the toner content detecting portion in a direction in which the detecting surface crosses the first direction.
Claims14
A developing device comprising:
- a rotatable developer carrying member configured to carry a developer containing non-magnetic toner and a magnetic carrier;
- first and second chambers configured to accommodate the developer supplied to said developer carrying member;
- a first rotatable feeding member provided in said first chamber and configured to feed the developer in a first direction;
- a second rotatable feeding member provided in said second chamber and configured to feed the developer in a second direction opposite to the first direction;
- a first communication port configured to permit feeding of the developer from said second chamber to said first chamber;
- a second communication port configured to permit feeding of the developer from said first chamber to said second chamber;
- and
- a toner content detecting portion including a planar detecting surface including at least a planar coil generating a magnetic field and configured to detect the toner content,
- wherein said detecting surface is provided in a region of said first communication port sandwiched between a rotational axis of said first rotatable feeding member and a rotational axis of said second rotatable feeding member and is disposed at a position such that the developer is fed toward both sides of said detecting toner content detecting portion in a direction in which said detecting surface crosses the first direction.
A developing device comprising:
- a rotatable developer carrying member configured to carry a developer containing non-magnetic toner and a magnetic carrier;
- a first chamber configured to accommodate the developer supplied to said developer carrying member;
- a second chamber configured to accommodate the developer circulated between said first and second chambers;
- a partition wall provided between said first and second chambers;
- a first rotatable feeding member provided in said first chamber and configured to feed the developer in a first direction;
- a second rotatable feeding member provided in said second chamber and configured to feed the developer in a second direction opposite to the first direction;
- a first communication port provided to said partition wall and configured to permit feeding of the developer from said second chamber to said first chamber;
- a second communication port provided to said partition wall and configured to permit feeding of the developer from said first chamber to said second chamber;
- and
- a toner content detecting portion provided in said second chamber and including a planar detecting surface including at least a planar coil generating a magnetic field and configured to detect the toner content,
- wherein said detecting surface is provided along and opposed to said second rotatable feeding member and is disposed at a position such that the developer is fed toward both sides of said detecting surface.
Dependencies are inferred from the claim text.