US4545669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage electrophotography with simultaneous photoreceptor charging, exposure and development
Assignee: Xerox Corp
•
Filing: 1984-02-21
•
Granted: 1985-10-08
•
Expires: 2004-02-21
Abstract
Abstract This invention relates to an apparatus for simultaneously charging, exposing, and developing imaging members at low voltages which comprises a semi-transparent deflected flexible imaging member, an electronic imaging source means, a light beam deflector member, a modulator means, a laser means, a sensitizing roll means, containing magnets therein, a development roll means containing magnets therein, a voltage source means for the sensitizing roll means, a voltage source means for the development roll means, a developer supply reservoir containing conductive developer particles therein comprised of insulating toner resin particles and conductive carrier particles, a sensitizing nip situated between the flexible imaging member and the sensitizing roll, a development nip situated between the imaging member and the development roller, the sensitizing roll means and development roll means moving in the same direction of movement as the semi-transparent deflected flexible imaging member, the voltage being generated by the voltage source with the sensitizing nip being of an opposite polarity of the voltage generated by the voltage source for the development roller, wherein an electric field of a predetermined polarity is established between the semi-transparent deflected flexible imaging member and the sensitizing roll means, which field exerts in the sensitizing nip an electrostatic force on the charged toner particles causing these particles to uniformly migrate toward the imaging member, subsequently subjecting the deflected flexible imaging member to the electronic image source whereby the electrostatic force exerted on the toner particles adjacent the light struck areas of the flexible imaging member are increased thereby causing toner particles to be deposited on the deflected flexible imaging member, and wherein toner particles are removed from the deflected flexible imaging member in areas not exposed to light by the development roll and developed in the areas exposed to light.
Inventors
- 👤 Dan A. Hays
- 👤 William H. Wayman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:24
CPC Classifications
B; B82; B82Y; B82Y15/00; G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0241; G03G15/06; G03G15/08; G03G15/09; G03G15/22; G03G15/24; G03G15/34; G03G15/342; G03G2215/00; G03G2215/02; G03G2215/021; G03G2215/022; G03G2215/04; G03G2215/0497
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
287 words
An apparatus for simultaneously charging, exposing, and developing imaging members at low voltages comprised of a semi-transparent deflected flexible imaging member, an electronic imaging source means, a light beam deflector member, a modulator means, a laser means, a sensitizing roll means, containing magnets therein, a development roll means with magnets therein, a voltage source means for the sensitizing roll means, a voltage source means for the development roll means, a developer supply reservoir containing conductive developer particles therein comprised of insulating toner resin particles and conductive carrier particles, a sensitizing nip situated between the flexible imaging member and the sensitizing roll, a development nip situated between the imaging member and the development roller, the sensitizing roll means and development roll means moving in the same direction of movement as the semi-transparent deflected flexible imaging member, the voltage being generated by the voltage source for the sensitizing nip being of an opposite polarity of the voltage generated by the voltage source for the development roller, wherein an electric field of a predetermined polarity is established between the semi-transparent deflected flexible imaging member and the sensitizing roll means, which field exerts in the sensitizing nip an electrostatic force on the charged toner particles causing these particles to uniformly migrate toward the imaging member, subsequently subjecting the deflected flexible imaging member to the electronic image source whereby the electrostatic force exerted on the toner particles adjacent the light struck areas of the flexible imaging member are increased, thereby causing toner particles to be deposited on the deflected flexible imaging member, and wherein toner particles are removed from the deflected flexible imaging member in areas not exposed to light by the development roll, and developed in the areas exposed to light.
Claim 2
Independent Claim
287 words
An apparatus for simultaneously charging, exposing, and developing imaging members at low voltages comprised of a semi-transparent deflected flexible imaging member, an electronic imaging source means, a light beam deflector member, a modulator means, a laser means, a sensitizing roll means, containing magnets therein, a development roll means with magnets therein, a voltage source means for the sensitizing roll means, a voltage source means for the development roll means, a developer supply reservoir containing conductive developer particles therein comprised of insulating toner resin particles and conductive carrier particles, a sensitizing nip situated between the flexible imaging member and the sensitizing roll, a development nip situated between the imaging member and the development roller, the sensitizing roll means and development roll means moving in the same direction of movement as the semi-transparent deflected flexible imaging member, the voltage being generated by the voltage source for the sensitizing nip being of an opposite polarity of the voltage generated by the voltage source for the development roller, wherein an electric field of a predetermined polarity is established between the semi-transparent deflected flexible imaging member and the sensitizing roll means, which field exerts in the sensitizing nip an electrostatic force on the charged toner particles causing these particles to uniformly migrate toward the imaging member, subsequently subjecting the deflected flexible imaging member to the electronic image source whereby the electrostatic force exerted on the toner particles adjacent the light struck areas of the flexible imaging member are increased, thereby causing toner particles to be deposited on the deflected flexible imaging member, and wherein toner particles are removed from the deflected flexible imaging member in areas not exposed to light by the development roll, and developed in the areas exposed to light.
Claim 3
Dependent Claim
26 words
An apparatus in accordance with claim 1 wherein the ratio of sensitizing roll surface speed to the imaging member speed is from about 1.5 to 6.
Claim 4
Dependent Claim
35 words
An apparatus in accordance with claim 1 wherein there is applied to the sensitizing roll member a voltage of from about -100 volts to about -600 volts, and the insulative toner particles are negatively charged.
Claim 5
Dependent Claim
24 words
An apparatus in accordance with claim 1 wherein the voltage supplied to the development roll is from about zero volts to about 100 volts.
Claim 6
Dependent Claim
27 words
An apparatus in accordance with claim 1 wherein the ratio of the speed of the development roll to the imaging member is from about 1.5 to 6.
Claim 7
Dependent Claim
33 words
An apparatus in accordance with claim 1 further including a transfer station wherein the developed image is caused to transfer to a suitable support medium, and subsequently fixing this developed image by heat.
Claim 8
Dependent Claim
28 words
An apparatus in accordance with claim 1 wherein the deflected flexible imaging member is comprised of a supporting substrate, a photogenerating layer, and an amine charge transport layer.
Claim 9
Dependent Claim
32 words
An apparatus in accordance with claim 7 wherein the photogenerating layer is comprised of trigonal selenium, metal phthalocyanines, metal-free phthalocyanines, or vanadyl phthalocyanines, optionally dispersed in an inactive resinous polymeric binder composition.
Claim 10
Dependent Claim
21 words
An apparatus in accordance with claim 7 wherein the charge transport layer contains N,N'-diphenyl-N,N'-bis-3-methylphenyl 1,1'-biphenyl-4,4'-diamine, dispersed in a resinous binder composition.
Claim 11
Dependent Claim
54 words
A method for obtaining developed electrostatic latent images with simultaneous charge, exposure, development, and cleaning, which comprises providing the apparatus of claim 1 forming an electrostatic latent image on the deflected flexible imaging member contained in said apparatus, developing this image with toner particles, and subsequently transferring the developed image to a suitable substrate.
Claim 12
Dependent Claim
60 words
A method of imaging in accordance with claim 10 wherein the imaging member is comprised of a supporting substrate, a photogenerating layer selected from the group consisting of trigonal selenium, metal phthalocyanines, metal-free phthalocyanines, and vanadyl phthalocyanines, optionally dispersed in an inactive resinous binder composition, and a diamine transport layer containing the diamine molecules dispersed in an inactive resinous binder.
Claim 13
Dependent Claim
45 words
A method of imaging in accordance with claim 10 wherein the insulating toner particles are comprised of a styrene methacrylate copolymer, a styrene butadiene copolymer, or a polyester composition, and there is included as an optional component in the toner composition a charge enhancing additive.
Claim 14
Dependent Claim
19 words
A method of imaging in accordance with claim 12 wherein the charge enhancing additive is an alkyl pyridinium halide.
Claim 15
Dependent Claim
17 words
A method of imaging in accordance with claim 13 wherein the alkyl pyridinium halide is cetylpyridinium chloride.
Claim 16
Dependent Claim
28 words
An apparatus in accordance with claim 1 wherein the sensitizing and development electrodes are positioned in close proximity on a stationary shell with an internal rotating magnetic assembly.
Claim 17
Dependent Claim
25 words
An apparatus in accordance with claim 1 wherein there is selected as developer particles a conductive single component toner comprised of resin particles and magnetite.
Claim 18
Dependent Claim
25 words
An apparatus in accordance with claim 15 wherein there is selected as developer particles a conductive single component toner comprised of resin particles and magnetite.
Claim 19
Dependent Claim
33 words
An apparatus in accordance with claim 16 wherein the developer particles are comprised of conductive single component composition containing toner resin particles and magnetite, with carbon black heat spheroidized on the surface thereof.
Claim 20
Dependent Claim
33 words
An apparatus in accordance with claim 17 wherein the developer particles are comprised of conductive single component composition containing toner resin particles and magnetite, with carbon black heat spheroidized on the surface thereof.
Claim 21
Dependent Claim
35 words
An apparatus in accordance with claim 15 wherein toner particles are removed by the development roller from the deflected flexible imaging member in areas exposed to light and developed in areas not exposed to light.
Claim 22
Dependent Claim
35 words
An apparatus in accordance with claim 16 wherein toner particles are removed by the development roller from the deflected flexible imaging member in areas exposed to light and developed in areas not exposed to light.
Claim 23
Dependent Claim
35 words
An apparatus in accordance with claim 1 wherein toner particles are removed by the development roller from the deflected flexible imaging member in areas exposed to light and developed in areas not exposed to light.
Claim 24
Independent Claim
279 words
An apparatus for simultaneously charging, exposing, and developing imaging members at low voltages comprised of a semi-transparent deflected flexible imaging member, a light source means, an optical lens means, a sensitizing roll means, containing magnets therein, a development roll means with magnets therein, a voltage source means for the sensitizing roll means, a voltage source means for the development roll means, a developer supply reservoir containing conductive developer particles therein comprised of insulating toner resin particles and conductive carrier particles, a sensitizing nip situated between the flexible imaging member and the sensitizing roll, a development nip situated between the imaging member and the development roller, the sensitizing roll means and development roll means moving in the same direction of movement as the semi-transparent deflected flexible imaging member, the voltage being generated by the voltage source for the sensitizing nip being of an opposite polarity of the voltage generated by the voltage source for the development roller, wherein an electric field of a predetermined polarity is established between the semi-transparent deflected flexible imaging member and the sensitizing roll means, which field exerts in the sensitizing nip an electrostatic force on the charged toner particles causing these particles to uniformly migrate toward the imaging member, subsequently subjecting the deflected flexible imaging member to the optical image source whereby the electrostatic force exerted on the toner particles adjacent the light struck areas of the flexible imaging member are increased, thereby causing toner particles to be deposited on the deflected flexible imaging member, and wherein toner particles are removed from the deflected flexible imaging member in areas not exposed to light by the development roll, and developed in the areas exposed to light.
Claim 25
Independent Claim
279 words
An apparatus for simultaneously charging, exposing, and developing imaging members at low voltages comprised of a semi-transparent deflected flexible imaging member, a light source means, an optical lens means, a sensitizing roll means, containing magnets therein, a development roll means with magnets therein, a voltage source means for the sensitizing roll means, a voltage source means for the development roll means, a developer supply reservoir containing conductive developer particles therein comprised of insulating toner resin particles and conductive carrier particles, a sensitizing nip situated between the flexible imaging member and the sensitizing roll, a development nip situated between the imaging member and the development roller, the sensitizing roll means and development roll means moving in the same direction of movement as the semi-transparent deflected flexible imaging member, the voltage being generated by the voltage source for the sensitizing nip being of an opposite polarity of the voltage generated by the voltage source for the development roller, wherein an electric field of a predetermined polarity is established between the semi-transparent deflected flexible imaging member and the sensitizing roll means, which field exerts in the sensitizing nip an electrostatic force on the charged toner particles causing these particles to uniformly migrate toward the imaging member, subsequently subjecting the deflected flexible imaging member to the optical image source whereby the electrostatic force exerted on the toner particles adjacent the light struck areas of the flexible imaging member are increased, thereby causing toner particles to be deposited on the deflected flexible imaging member, and wherein toner particles are removed from the deflected flexible imaging member in areas not exposed to light by the development roll, and developed in the areas exposed to light.
Claim 26
Dependent Claim
28 words
An apparatus in accordance with claim 23 wherein the sensitizing and development electrodes are positioned in close proximity on a stationary shell with an internal rotating magnetic assembly.
Claim 27
Dependent Claim
25 words
An apparatus in accordance with claim 23 wherein there is selected as developer particles a conductive single component toner comprised of resin particles and magnetite.
Claim 28
Dependent Claim
25 words
An apparatus in accordance with claim 24 wherein there is selected as developer particles a conductive single component toner comprised of resin particles and magnetite.
Claim 29
Dependent Claim
34 words
An apparatus in accordance with claim 25 wherein the developer particles are comprised of a conductive single component composition containing toner resin particles and magnetite, with carbon black heat spheroidized on the surface thereof.
Claim 30
Dependent Claim
34 words
An apparatus in accordance with claim 26 wherein the developer particles are comprised of a conductive single component composition containing toner resin particles and magnetite, with carbon black heat spheroidized on the surface thereof.
Claim 31
Dependent Claim
35 words
An apparatus in accordance with claim 24 wherein toner particles are removed by the development roller from the deflected flexible imaging member in areas exposed to light and developed in areas not exposed to light.
Claim 32
Dependent Claim
35 words
An apparatus in accordance with claim 25 wherein toner particles are removed by the development roller from the deflected flexible imaging member in areas exposed to light and developed in areas not exposed to light.
Claim 33
Dependent Claim
36 words
An apparatus in accordance with claim 23 wherein the toner particles are removed by the development roller from the deflected flexible imaging member in areas exposed to light and developed in areas not exposed to light.
References Cited (Backward Citations)
US3284224A
Cited
US3308233A
Cited
US3741760A
Cited
US3857549A
Cited
US3853397A
Cited
US4060321A
Cited
US3877934A
Cited
US3820985A
Cited
US4014697A
Cited
US3924945A
Cited
US4084896A
Cited
US4173407A
Cited
US4404574A
Cited
US4130359A
Cited
US4167326A
Cited
US4174903A
Cited
US4289837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |