Image forming apparatus
First Claim
Patent Images
1. An image forming apparatus comprising:
- (a) a charging means for primarily charging a photosensitive member which is a first image carrying member wherein said photosensitive member includes an organic photoconductive material and a layer forming the surface of said photosensitive member, said layer comprising a polycarbonate resin;
(b) an exposure means for exposing said photosensitive member to light so as to form a latent image thereon;
(c) a developing means for reversely developing the latent image on said photosensitive member to form a toner image on said photosensitive member, wherein said developing means comprises (i) a sleeve having a surface layer of a thin layer of electrical conductive material containing carbon particles dispersed therein which forms an irregular surface and (ii) a developer supported on said thin layer containing insulating magnetic toner particles triboelectrically chargeable to a negative polarity comprising (a) a styrene-acrylic type copolymer or a polyester resin and (b) magnetic powder, wherein said insulating magnetic toner includes;
(i) from about 17-60% by number (N) of said magnetic toner particles having a particle size of 5 microns or less;
said magnetic toner particles having said particle size of 5 microns or less having a particle size distribution of the formula;
space="preserve" listing-type="equation">N/V=-0.05 N+k wherein N is as above;
V is the percent by volume of said magnetic toner particles having a particle size of 5 microns or less and k is a positive number from 4.6 to 6.7;
(ii) from about 5-50% by number of said magnetic toner particles having a particle size ranging from 6.35 to 10.08 microns;
(iii) said magnetic toner particles having a volume-average particle size from 6 to 9 microns;
(iv) from about 2% by volume or less of said magnetic toner particles having a particle size from 12.70 microns or higher;
(d) a transfer means for transferring the toner image on said photosensitive member onto a second image carrying member; and
(e) a cleaning means for removing toner particles remaining on said photosensitive member after the transfer has been completed.
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Abstract
An image forming apparatus has a charging device for charging a photosensitive member containing an organic photoconducter, an exposure device, a developing device including a developer, a transfer device and a cleaning device. The photosensitive member employs an organic photoconductor and a polycarbonate resin layer which forms the surface of the photosensitive member. The developer device has a sleeve with a thin layer of an electrical coating material containing dispersed carbon particles. The developer contains insulating magnetic toner particles of relatively small particle size formed from a styrene-acrylic type copolymer or a polyester resin and a magnetic powder.
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Citations
17 Claims
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1. An image forming apparatus comprising:
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(a) a charging means for primarily charging a photosensitive member which is a first image carrying member wherein said photosensitive member includes an organic photoconductive material and a layer forming the surface of said photosensitive member, said layer comprising a polycarbonate resin; (b) an exposure means for exposing said photosensitive member to light so as to form a latent image thereon; (c) a developing means for reversely developing the latent image on said photosensitive member to form a toner image on said photosensitive member, wherein said developing means comprises (i) a sleeve having a surface layer of a thin layer of electrical conductive material containing carbon particles dispersed therein which forms an irregular surface and (ii) a developer supported on said thin layer containing insulating magnetic toner particles triboelectrically chargeable to a negative polarity comprising (a) a styrene-acrylic type copolymer or a polyester resin and (b) magnetic powder, wherein said insulating magnetic toner includes; (i) from about 17-60% by number (N) of said magnetic toner particles having a particle size of 5 microns or less;
said magnetic toner particles having said particle size of 5 microns or less having a particle size distribution of the formula;
space="preserve" listing-type="equation">N/V=-0.05 N+kwherein N is as above;
V is the percent by volume of said magnetic toner particles having a particle size of 5 microns or less and k is a positive number from 4.6 to 6.7;(ii) from about 5-50% by number of said magnetic toner particles having a particle size ranging from 6.35 to 10.08 microns; (iii) said magnetic toner particles having a volume-average particle size from 6 to 9 microns; (iv) from about 2% by volume or less of said magnetic toner particles having a particle size from 12.70 microns or higher; (d) a transfer means for transferring the toner image on said photosensitive member onto a second image carrying member; and (e) a cleaning means for removing toner particles remaining on said photosensitive member after the transfer has been completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A facsimile machine comprising an electrophotographic apparatus and a reception means for receiving image information from a remote terminal, said photoelectric apparatus comprising:
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(a) a charging means for primarily charging a photosensitive member which is a first image carrying member, wherein said photosensitive member includes an organic photoconductive material and a layer forming the surface of said photosensitive member, said layer comprising a polycarbonate resin; (b) an exposure means for exposing said photosensitive member to light so as to form a latent image thereon; (c) a developing means for reversely developing the latent image on said photosensitive member to form a toner image on said photosensitive member, wherein said developing means comprises (i) a sleeve having a surface layer of a thin layer of an electrical conductive material containing carbon particles dispersed therein, which forms an irregular surface and (ii) a developer supported on said thin layer, containing insulating magnetic toner particles triboelectrically chargeable to a negative polarity comprising (a) a styrene-acrylic type copolymer or a polyester resin and (b) magnetic powder, wherein said insulating magnetic toner includes; (i) from about 17-60% by number (N) of said magnetic toner particles having a particle size of 5 microns or less, said magnetic toner particles having said particle size of 5 microns or less having a particle size distribution of the formula;
space="preserve" listing-type="equation">N/V=-0.05 N+kwherein N is as above;
V is the percent by volume of said magnetic toner particles having a particle size of 5 microns or less and k is a positive number from 4.6 to 6.7;(ii) from about 5-50% by number of said magnetic toner particles having a particle size ranging from 6.35 to 10.08 microns; (iii) said magnetic toner particles having a volume-average particle size from 6 to 9 microns; (iv) from about 2% by volume or less of said magnetic toner particles having a particle size from 12.70 microns or higher; (d) a transfer means for transferring the toner image on said photosensitive member onto a second image carrying member; and (e) a cleaning means for removing toner remaining on said photosensitive member after the transfer has been completed.
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Specification