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AssigneeCanon Kabushiki Kaisha
InventorsAkiyoshi Yokoi, Toru Oguma
Estimating the term…
In a developing device, process cartridge, and the like, including a developer amount detector for detecting a developer amount by detecting a change in capacitance among a plurality of electrodes, a developer is circulated and supplied in an optimal manner among the electrodes constituting the developer amount detector. The lower end portion on the upper side of an opening is above the lower end portion of a second electrode. With the opening formed in this manner, when toner in a developer frame is fed among the electrodes by a toner feeding member, the toner is urged into the developing frame without being interfered with by the lower end portion on the upper side of the opening. Ideal toner circulation and toner supply can be performed, and a detection error can be decreased.
A process cartridge detachably mountable in a main body of an electrophotographic image forming apparatus, said process cartridge comprising:
A developing device detachably mountable in a main body of an electrophotographic image forming apparatus and used for developing an electrostatic latent image formed on an electrophotographic photosensitive member, said developing device comprising:
An electrophotographic image forming apparatus for forming an image on a recording medium, said electrophotographic image forming apparatus comprising:
A developer frame for a developing device, which is detachably mountable in a main body of an electrophotographic image forming apparatus to develop an electrostatic latent image formed on an electrophotographic photosensitive member by a developing roller, and has developer amount detecting means, having a first electrode provided along a longitudinal direction of said developing roller and a second electrode provided closer to a supply opening of said developer frame than said first electrode, said first and second electrodes being arranged at such positions that a developer can enter therebetween, for detecting a capacitance between said second and first electrodes which is generated when a voltage is applied to said second electrode so that the main body detects a developer amount, wherein
A process cartridge detachably mountable in a main body of an electrophotographic image forming apparatus, said process cartridge comprising:
A developing device detachably mountable in a main body of an electrophotographic image forming apparatus and used for developing an electrostatic latent image formed on an electrophotographic photosensitive member, said developing device comprising:
An electrophotographic image forming apparatus for forming an image on a recording medium, said electrophotographic image forming apparatus comprising:
A developer frame for a developing device, which is detachably mountable in a main body of an electrophotographic image forming apparatus to develop an electrostatic latent image formed on an electrophotographic photosensitive member by a developing roller, and has developer amount detecting means, having a first electrode provided along a longitudinal direction of said developing roller and a second electrode provided closer to a supply opening of said developing frame than said first electrode, said first and second electrodes being arranged at such positions that a developer can enter therebetween, for detecting a capacitance between said second and first electrodes which is generated when a voltage is applied to said second electrode so that the main body detects a developer amount, wherein
An electrophotographic image forming apparatus, in which a process cartridge is detachably mountable for forming an image on a recording medium, the process cartridge being detachably mountable in a main body of said electrophotographic image forming apparatus and comprising an electrophotographic photosensitive member, a developing roller for developing a latent image formed on the electrophotographic photosensitive member by using a developer, a developer frame for containing the developer and having a supply opening, through which the developer is supplied to the developing roller, a first electrode provided along a longitudinal direction of the developing roller, and a second electrode provided closer to the supply opening than the first electrode, wherein the first and second electrodes are arranged at such positions that the developer can enter therebetween, and a capacitance between the second and first electrodes, which is generated when a voltage is applied to the second electrode, is detected so that said main body detects a developer amount, and the developer frame is arranged such that a lower end portion on an upper side of the supply opening of the developer frame is above a lower end of the second electrode, said electrophotographic image forming apparatus comprising:
An electrophotographic image forming apparatus, in which a process cartridge is detachably mountable for forming an image on a recording medium, the process cartridge being detachably mountable in a main body of said electrophotographic image forming apparatus and comprising an electrophotographic photosensitive member, a developing roller for developing a latent image formed on the electrophotographic photosensitive member by using a developer, a developer frame for containing the developer and having a supply opening, through which the developer is supplied to the developing roller, a seal member attached to the developer frame and adapted to close the supply opening of the developer frame, thereby sealing the developer the developer frame, a first electrode provided along a longitudinal direction of the developing roller, and a second electrode provided closer to the supply opening than the first electrode, wherein the first and second electrodes are arranged at such positions that the developer can enter therebetween, and a capacitance between the second and first electrodes which is generated when a voltage is applied to the second electrode is detected so that the main body detects a developer amount, the seal member is removable, leaving an attached portion thereof when removed which is attached to the developer frame, so that the supply opening is unsealed and the developer can be supplied to the developing roller, and an upper side of the attached portion of the seal member, which is left after unsealing, is above a lower end of the second electrode, said electrophotographic image forming apparatus comprising:
Dependencies are inferred from the claim text.