EP0323252A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for electrophotographic process
Assignee: Toshiba Corp
•
Filing: 1988-12-29
•
Granted: —
•
Expires: 2008-12-29
Abstract
Abstract 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/cm²), 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 (Ω), are adjusted so as to satisfy the formula, |q|m ≦ 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 ≦ 200/1. Further, when a charging device (53), an electrostatic latent image forming device (55), a transfer device (59), a cleaning device (61), a discharge device (63), a charging and cleaning device, and 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 (21) composed of an elastic roller base (23) and a flexible conductor layer (25), 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.
Inventors
- 👤 Masahiro C/O Patent Division K. K. Toshiba Hosoya
- 👤 Shuitsu C/O Patent Division K. K. Toshiba Sato
- 👤 Mitsunaga C/O Patent Division K. K. Toshiba Saito
- 👤 Tsutomu C/O Patent Division K. K. Toshiba Uehara
- 👤 Mitsuharu Endo
- 👤 Yukio Futamata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 23:43
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1295; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233; G03G15/06; G03G15/08; G03G15/0806; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/1685; G03G21/00; G03G21/0005; G03G21/0058; G03G21/06; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0617; G03G2215/0634; G03G2215/0636
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
145 words
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: |q| m = 100/vℓR wherein q stands for the magnitude of charging of said toner (C/g), m for the amount of said toner attached to the surface of said toner carrier per unit area of said surface (g/cm²), v for the speed of movement of said toner carrier (cm/sec), ℓ for the available length of said toner carrier (cm), and R (Ω) for the magnitude of electric resistance between the surface of said toner carrier and means for application of said developing bias voltage.
Claim 2
Dependent Claim
145 words
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: |q| m = 100/vℓR wherein q stands for the magnitude of charging of said toner (C/g), m for the amount of said toner attached to the surface of said toner carrier per unit area of said surface (g/cm²), v for the speed of movement of said toner carrier (cm/sec), ℓ for the available length of said toner carrier (cm), and R (Ω) for the magnitude of electric resistance between the surface of said toner carrier and means for application of said developing bias voltage.
Claim 3
Dependent Claim
38 words
The developing device of claim 1, wherein the width of contact between the surface of said toner carrier and the surface of said electrostatic latent image retaining layer is in the range of 0.3 mm to 6.0 mm.
Claim 4
Dependent Claim
28 words
The developing device of claim 2, wherein the pressure of contact between said toner carrier and said electrostatic latent image retaining layer is no more than 1 kg/cm².
Claim 5
Dependent Claim
31 words
The developing device of claim 3, wherein the depth of contact between said toner carrier and said electrostatic latent image retaining layer is in the range 0.1 mm to 2.0 mm.
Claim 6
Dependent Claim
22 words
The developing device of claim 4, wherein the roughness of the surface of said toner carrier is no more than 3 µm.
Claim 7
Dependent Claim
30 words
The developing device of claim 5, wherein means for forming said thin toner layer is an elastic member or a rigid member pressed against the surface of said toner carrier.
Claim 8
Dependent Claim
59 words
The developing device of claim 6, which is provided with means for applying such a voltage to the surface of said toner, carrier that the absolute value of the potential difference between the image part of said electrostatic latent image and the surface of said toner carrier is no less than 100 V and no more than 600 V.
Claim 9
Dependent Claim
53 words
The developing device of claim 7, which is provided with means for applying such a voltage to the surface of said toner carrier that the absolute value of the potential difference between the non-image part of said electrostatic latent image and the surface of said toner carrier is no less than 50 V.
Claim 10
Dependent Claim
47 words
The developing device of claim 1, wherein said toner carrier is an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed tightly on the periphery of said roller base and said toner carrier possesses an ability to produce a cleaning action.
Claim 11
Dependent Claim
101 words
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: R ≦ 200/I wherein I (A) stands for the magnitude of a developing electric current and R (Ω) for the magnitude of electric resistance between the surface of said toner carrier and means for application of said developing bias voltage.
Claim 12
Dependent Claim
101 words
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: R ≦ 200/I wherein I (A) stands for the magnitude of a developing electric current and R (Ω) for the magnitude of electric resistance between the surface of said toner carrier and means for application of said developing bias voltage.
Claim 13
Dependent Claim
71 words
A charging device incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base, which charging device is characterized by the fact that said elastic electroconductive roller is provided at least on the peripheral surface thereof with a conductor layer formed mainly of polyurethane resin and possessing a magnitude of resistance of no more than 10¹²Ω·cm.
Claim 14
Dependent Claim
71 words
A charging device incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base, which charging device is characterized by the fact that said elastic electroconductive roller is provided at least on the peripheral surface thereof with a conductor layer formed mainly of polyurethane resin and possessing a magnitude of resistance of no more than 10¹²Ω·cm.
Claim 15
Dependent Claim
33 words
A charging and cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 16
Dependent Claim
33 words
A charging and cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 17
Dependent Claim
101 words
A transfer device incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base, which transfer device is characterized by the fact that said elastic electroconductive roller incorporates therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base, wherein said elastic electroconductive roller is provided on the peripheral surface with a conductor layer formed mainly at least of polyurethane resin and possessing a magnitude of resistance of no more than 10¹²Ω·cm.
Claim 18
Dependent Claim
101 words
A transfer device incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base, which transfer device is characterized by the fact that said elastic electroconductive roller incorporates therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base, wherein said elastic electroconductive roller is provided on the peripheral surface with a conductor layer formed mainly at least of polyurethane resin and possessing a magnitude of resistance of no more than 10¹²Ω·cm.
Claim 19
Dependent Claim
31 words
A discharging device, characterized by incorporating therein an elastic electroconductive roller provided with and elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 20
Dependent Claim
31 words
A discharging device, characterized by incorporating therein an elastic electroconductive roller provided with and elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 21
Dependent Claim
33 words
A discharging and cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 22
Dependent Claim
33 words
A discharging and cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 23
Dependent Claim
66 words
An electrostatic latent image forming device, characterized by the fact that charging means incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the 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 the exposure part of which is transparent.
Claim 24
Dependent Claim
66 words
An electrostatic latent image forming device, characterized by the fact that charging means incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the 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 the exposure part of which is transparent.
Claim 25
Dependent Claim
68 words
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 conductor layer superposed fast on the 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 the exposure part of which is transparent.
Claim 26
Dependent Claim
68 words
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 conductor layer superposed fast on the 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 the exposure part of which is transparent.
Claim 27
Dependent Claim
31 words
A cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
Claim 28
Dependent Claim
31 words
A cleaning device, characterized by incorporating therein an elastic electroconductive roller provided with an elastic roller base and a flexible conductor layer superposed fast on the periphery of said roller base.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.