Image information recording apparatus

Claim 2

An image information recording apparatus comprising: first corona discharge means for applying primary charge to the surface of the insulating layer of an electro-photographic sensitive medium comprising an electrically conductive substrate, a photoconductive layer, and an electrically insulative layer; first optical means for causing a first light image of a modulated laser beam to scan over said insulating layer for exposure; second corona discharge means for applying to said insulating layer a corona discharge having at least a component of opposite polarity to that of said primary charge; and second optical means for effecting a second light image exposure after said first exposure by said first optical means and after operation of said second corona discharge means at a position associated with the position of the first light image exposure to form an overlaid image.

Claim 3

An image information recording apparatus according to claim 1, further comprising means for carrying thereon a plurality of images for formation of the second light image, and means for selecting one of said plurality of images for exposure.

Claim 4

An image information recording apparatus according to claim 2, further comprising means for developing said overlaid image, means for transferring the developed image onto a transfer medium, means for fixing said transferred image, and means for cleaning said sensitive medium. PG,50

Claim 5

An image information recording apparatus according to claim 1, further comprising means capable of directing the second light image to the position of the first light image.

Claim 6

An image information recording apparatus according to claim 1, further comprising means for effecting overall exposure upon said sensitive medium and wherein said overall exposure means and said second optical means are selectively operated.

Claim 7

An image information recording apparatus according to claim 5, further comprising means for selectively directing the second light image to the position of the first light image and wherein uniform exposure at the exposure position of the second light image is effected with the aid of said overall exposure means when the second light image is irradiated into the exposure position of the first light image.

Claim 8

An image information recording apparatus according to claim 6, wherein said first and second optical means are selectively operated.

Claim 9

An image information recording apparatus according to claim 1, wherein said sensitive medium is movable and further comprising position indicator means to detect the position of said sensitive medium and feed back means for initiating said second image exposure in response to a signal from said indicator means.

Claim 10

An image information handling apparatus comprising: first corona discharge means for applying primary charge to the surface of the insulating layer of an electrophotographic sensitive medium basically comprising an electrically conductive substrate, a photoconductive layer, and electrically insulative layer; first optical means for causing a first light image exposure over said insulating layer; second corona discharge means for applying to said insulating layer a corona discharge having at least a component of opposite polarity to that of said primary charge; and second optical means for effecting a second light image exposure after said first exposure by said first optical means and after operation of said second corona discharge means in a position associated with the position of the first light image exposure, at least one of said first and second optical means using a laser beam; whereby a resultant electrostatic latent image is formed by the light image exposures through said first and second optical means.

Claim 11

An image information handling apparatus comprising: first corona discharge means for applying primary charge to the surface of the insulating layer of an electrophotographic sensitive medium basically comprising an electrically conductive substrate, a photoconductive layer, and electrically insulative layer; first optical means for causing a first light image exposure over said insulating layer; second corona discharge means for applying to said insulating layer a corona discharge having at least a component of opposite polarity to that of said primary charge; and second optical means for effecting a second light image exposure after said first exposure by said first optical means and after operation of said second corona discharge means in a position associated with the position of the first light image exposure, at least one of said first and second optical means using a laser beam; whereby a resultant electrostatic latent image is formed by the light image exposures through said first and second optical means.

Claim 12

An image information recording apparatus comprising: first corona discharge means for applying primary charge to the surface of the insulating layer of an electrophotographic sensitive medium comprising an electrically conductive substrate, a photoconductive layer, and an electrically insulative layer; optical means including image-forming lens means for focussing and scanning means, said optical means causing a first light image of a modulated laser beam to scan over said insulating layer for exposure; second corona discharge means for applying to said insulating layer AC corona discharge simultaneously with the operation of said optical means; means for overlaying said first image information and second image information upon the same place of said electrophotographic medium by projecting said second image information after application of the AC corona discharge; means for developing said overlaid image; means for transferring the developed image onto a transfer medium; means for fixing said transferred image; and means for cleaning said sensitive medium after transfer.

Claim 13

An image information recording apparatus comprising: first corona discharge means for applying primary charge to the surface of the insulating layer of an electrophotographic sensitive medium comprising an electrically conductive substrate, a photoconductive layer, and an electrically insulative layer; optical means including image-forming lens means for focussing and scanning means, said optical means causing a first light image of a modulated laser beam to scan over said insulating layer for exposure; second corona discharge means for applying to said insulating layer AC corona discharge simultaneously with the operation of said optical means; means for overlaying said first image information and second image information upon the same place of said electrophotographic medium by projecting said second image information after application of the AC corona discharge; means for developing said overlaid image; means for transferring the developed image onto a transfer medium; means for fixing said transferred image; and means for cleaning said sensitive medium after transfer.

Claim 14

An apparatus according to claim 10, wherein said overlaying means comprises further optical means for directing said first image information to said sensitive medium while simultaneously optically combining a slit image of the second image information.

Claim 15

An apparatus according to claim 11, wherein said second image information includes a slit light image of an original held on an original holder.

Claim 16

An apparatus according to claim 11, wherein said second image information includes a slit light image provided by a drum having a predetermined image.

Claim 17

An electrographic apparatus comprising: a photosensitive drum rotatable about a central axis, said drum comprising an electrically conductive substrate, a photoconductive layer, and an electrically insulative layer; electrostatic latent image forming means disposed on one side of a substantially vertically extending line passing through the center of said photosensitive drum, said electrostatic latent image forming means including first corona discharge means for applying a primary charge to said photosensitive drum, means for applying a light image to said photosensitive drum, said light image applying means being positioned adjacent to said first corona discharge means in the direction of rotation of said photosensitive drum, and second corona discharge means for applying a second corona discharge having at least a component of opposite polarity to that of said primary charge; an original holder for retaining an original; said light image applying means comprising means for forming a modulated light beam, means for scanning the modulated beam across said photosensitive drum for a first exposure, means for focussing the scanning beam upon said photosensitive drum, means for illuminating an original held on said original holder, optical means including an image forming lens for directing light from the original to the surface of said photosensitive drum at a position downstream of said second corona discharge means for effecting a second exposure on a drum portion previously exposed to the secondary corona discharge; developing means disposed below said photosensitive drum for developing a latent image formed by said latent image forming means; and image transfer and fixing means disposed at the other side of the substantially vertically extending line for transferring and fixing a developed image.

Claim 18

An electrographic apparatus comprising: a photosensitive drum rotatable about a central axis, said drum comprising an electrically conductive substrate, a photoconductive layer, and an electrically insulative layer; electrostatic latent image forming means disposed on one side of a substantially vertically extending line passing through the center of said photosensitive drum, said electrostatic latent image forming means including first corona discharge means for applying a primary charge to said photosensitive drum, means for applying a light image to said photosensitive drum, said light image applying means being positioned adjacent to said first corona discharge means in the direction of rotation of said photosensitive drum, and second corona discharge means for applying a second corona discharge having at least a component of opposite polarity to that of said primary charge; an original holder for retaining an original; said light image applying means comprising means for forming a modulated light beam, means for scanning the modulated beam across said photosensitive drum for a first exposure, means for focussing the scanning beam upon said photosensitive drum, means for illuminating an original held on said original holder, optical means including an image forming lens for directing light from the original to the surface of said photosensitive drum at a position downstream of said second corona discharge means for effecting a second exposure on a drum portion previously exposed to the secondary corona discharge; developing means disposed below said photosensitive drum for developing a latent image formed by said latent image forming means; and image transfer and fixing means disposed at the other side of the substantially vertically extending line for transferring and fixing a developed image.

Claim 19

An apparatus according to claim 14, wherein said light image applying means is shiftable between a first position wherein the optical path for the light from the original and the optical path for the modulated beam cross the surface of the photosensitive drum at the same position, and a second position wherein the optical path for the light from the original and the optical path for the modulated beam cross the photosensitive drum surface at different positions.

Claim 20

An apparatus according to claim 15, wherein said light image applying means can selectively apply the light from the original or the modulated beam to said photosensitive drum.