Loading patent…
AssigneesKabushiki Kaisha Toshiba, Electric Co., Ltd.
InventorsMasahiro Hosoya, Shuitsu Sato, Mitsunaga Saito, Tsutomu Uehara, Mitsuharu Endo, Yukio Futamata
Estimating the term…
A developing device effects desirable development when the amount of charging of toner, q (C/g), the amount of toner deposited on the surface of a developing roller per unit area, m (g/cm.sup.2), the speed of movement of the surface of the developing roller, v (cm/sec), the available length of the developing roller, l (cm), and the magnitude of electric resistance between the surface of the developing roller and a power source for developing bias, R (.OMEGA.), are adjusted so as to satisfy the formula, .vertline.q.vertline.m.ltoreq.100/vlR. The developing device produces a developed image desirable in quality and free from background fogging when the magnitude of a developing electric current, I (A), is adjusted so as to satisfy the formula, R.ltoreq.200/I. Further, when a charging device, an electrostatic latent image forming device, a transfer device, a cleaning device, a discharge device, a charging and cleaning device, an electrostatic latent image forming and cleaning device, a developing and cleaning device, or a discharging and cleaning device is provided with an elastic electroconductive roller composed of an elastic roller base and a flexible conductor layer, the device is allowed to decrease size and lower price, curb the decline of capacity due to protracted use, and preclude the occurrence of dispersion of characteristic, efficiency, or performance.
A developing device for forming a thin layer of toner on the surface of a toner carrier subjected to developing bias voltage and converting an electrostatic latent image into a visible image by causing said thin toner layer to contact an electrostatic latent image rataining layer, which developing device is characterized by being adjusted so as to satisfy the conditional formula:
A developing device for forming a thin layer of toner on the surface of a toner carrier subjected to developing bias voltage and converting an electrostatic latent image into a visible image by causing said thin toner layer to contact an electrostatic latent image retaining layer, which developing device is characterized by being adjusted so as to satisfy the conditional formula:
A charging device incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base, said conductive layer being formed of polyurethane resin and possessing a magnitude of resistance of no more than 10.sup.12 .OMEGA.. cm, said conductive layer directly contacting a latent image retaining layer.
A charging and cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base, wherein said conductive layer directly contacts a latent image retaining layer.
A transfer device incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base, said conductive layer being formed at least of polyurethane resin and possessing a magnitude of resistance of no more than 10.sup.12 .OMEGA.. cm, and wherein said conductive layer directly contacts a transfer material.
A discharging device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base, wherein said conductive layer directly contacts a latent image retaining layer.
A discharging and cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base, wherein said conductive layer directly contacts a latent image retaining layer.
An electrostatic latent image forming device, characterized by the fact that discharging means incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base and exposure means are opposed to each other through the medium of an electrostatic latent image retaining layer at least an exposure part of which is transparent.
An electrostatic latent image forming and cleaning device, characterized by the fact that charging means incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base and exposure means are opposed to each other through the medium of an electrostatic latent image retaining layer at least an exposure part of which is transparent.
A cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductive layer superposed on a periphery of said roller base, wherein said conductor layer directly contacts a latent image retaining layer.
Dependencies are inferred from the claim text.