Abstract: An electrophotographic process of this invention is achieved by subjecting a photosensitive screen to a matched performance of voltage applications and image irradiation to form a primary electrostatic latent image for modulating the flow of corona ions to enable a secondary electrostatic latent image on a recording member disposed in close proximity to the screen bearing the primary electrostatic latent image.

Abstract: An electrophotographic process of this invention is achieved by subjecting a photosensitive screen to a matched performance of voltage applications and image irradiation to form a primary electrostatic latent image for modulating the flow of corona ions to enable a secondary electrostatic latent image on a recording member disposed in close proximity to the screen bearing the primary electrostatic latent image.

Abstract: An electrophotographic process of this invention is achieved by subjecting a photosensitive screen to a matched performance of voltage applications and image irradiation to form a primary electrostatic latent image for modulating the flow of corona ions to enable a secondary electrostatic latent image on a recording member disposed in close proximity to the screen bearing the primary electrostatic latent image.

Abstract: In an image formation method of forming an image by modulating an ion flow or charged particles with the aid of a screen having a number of fine passage openings, at least one of the screen and an image reception member is of arcuate cross-section at the modulating position and an image is formed on the screen. One of the screen and the image reception member which is greater in radius is rotated or moved at a higher velocity than the other, thereby modulating the image onto the image reception member.

Abstract: Disclosed is a method for protecting a primary electrostatic latent image formed on a screen type photosensitive member. In the step for modulating ion streams or toner particle streams by the primary electrostatic latent image, due to a bias voltage impressed on the screen type photosensitive member natural corona discharge is generated by a corona discharge electrode used for forming a primary electrostatic latent image or natural discharge is generated between the photosensitive member and a conductor located close thereto so that the degradation or destruction of the primary electrostatic latent image result. The present invention provides the methods for solving this problem by electrically isolating the photosensitive member, the corona discharge electrodes and other conductors in the vicinity of the photoconductive member when a bias voltage is impressed on the latter.

Abstract: An electrophotographic process of this invention is achieved by subjecting a photosensitive screen to a matched performance of voltage applications and image irradiation to form a primary electrostatic latent image for modulating the flow of corona ions to enable a secondary electrostatic latent image on a recording member disposed in close proximity to the screen bearing the primary electrostatic latent image.

Abstract: In a method of image formation, a primary electrostatic latent image is formed on a screen having a number of fine openings, the primary electrostatic latent image is used to modulate a flow of ions to thereby form a secondary electrostatic latent image on a recording medium, the secondary electrostatic latent image is developed by the use of a developer, the developed image is transferred to another recording member, the charging polarity of the residual portion of the developer remaining on the recording medium is controlled so that, at a position whereat the recording medium and the screen come close to each other, the residual developer may be subjected to a force directed toward the recording medium by an electric field present between the recording medium and the screen, and thereafter the recording medium is reused.

Abstract: This invention provides an electrophotographic process for forming an image using a photosensitive screen having a plurality of fine openings. The screen has a conductive material on which a photoconductive material is provided, wherein at least a part of the conductive material remains exposed. The peripheries of the openings of the screen are capable of retaining charges as a result of an image exposure to form a primary electrostatic latent image on the screen.

Abstract: The present invention aims at improvement in the image forming method, wherein ion current is modulated in an image form, on the basis of which a secondary electrostatic latent image is formed on a recording sheet, an insulated drum, and other recording media, and the thus formed electrostatic latent image is developed. In more detail, the entire region of such sheet and drum where such secondary electrostatic latent image is formed is uniformly charged beforehand to a desired potential, whereby the fogging phenomenon to occur at the time of development, and changes in the formed image which take place due to variations in the modulating quantity of the ion current on account of deterioration in an ion current modulating element can be prevented. Setting of the member to form thereon such secondary electrostatic latent image at a desired arbitrary potential can be done by, for example, varying the voltage to be applied to a grid provided in a corona discharger.

Abstract: In an electrophotographic method wherein a photosensitive screen having a multitude of tiny openings and formed by the use of a photoconductive member is used to form a primary electrostatic latent image thereon and a corona ion flow from a corona discharger is modulated by the primary electrostatic latent image to form a secondary electrostatic latent image on an electrically chargeable member, an acceleration field having a voltage Ve applied between the screen and the chargeable member is set to a range which satisfies the relation that (Ve-Vs)/d>500[V/mm], where d is the distance between the screen and the chargeable member, and Vs is the maximum potential of the secondary electrostatic latent image formed on the chargeable member.

Abstract: In an electrophotographic method using a screen-like photosensitive medium having a number of fine openings to effect image formation, an air stream directed toward corona discharge means is maintained in the openings of the screen-like photosensitive medium when the corona discharge means, at least during the process of latent image formation, is in operation.

Abstract: In an electrophotographic copying machine of the type which transfers an electrostatic latent image formed on a photosensitive element, usually comprising a conductive base and a photoconductive layer thereon, onto a recording member, an electric dust collector is provided to clean the air flowing in the vicinity of a corona discharger and the photosensitive member. In order to direct the dust-free air, there is provided an air flow passage and a blower such as a fan. The corona discharger and the electric dust collector may be constructed integrally or separately. All of the air in the copying machine may be made dust-free.

Abstract: An electrophotographic method by the use of a photosensitive screen having a number of tiny openings therein and by modulation of corona ion current, wherein a primary electrostatic latent image is first formed on the screen by application of electrostatic charge in conformity to an original image to be reproduced, thus a secondary electrostatic latent image is formed by modulating corona ion current for a plurality of times by the use of one and the same primary electrostatic latent image, and applying to the screen, alternately with the corona ion modulation, a corona ion current of a polarity capable of eliminating the charge polarity of the modulating corona ion current.

Abstract: This invention provides an electrophotographic process for forming an image using a photosensitive screen having a plurality of fine openings. The screen has a conductive material on which a photoconductive material is provided, wherein at least a part of the conductive material remains exposed. The peripheries of the openings of the screen are capable of retaining charges as a result of an image exposure to form a primary electrostatic latent image on the screen.

Abstract: In a color copying apparatus using a movable photosensitive medium having a plurality of openings therein, there are provided exposure means for exposing the photosensitive medium to color images corresponding to an original image, primary electrostatic image forming means for forming on the photosensitive medium an electrostatic latent image corresponding to the original image, support means for movably supporting a charge-retaining member in non-contact relationship with the photosensitive medium, secondary electrostatic image forming means for forming on the charge-retaining member an electrostatic image corresponding to the electrostatic latent image on the photosensitive medium, and developing means having a plurality of developing units disposed adjacent the support means to impart predetermined color developers.

Abstract: There is provided a copying machine which is most suitable for multiple reproduction at high speed. The copying machine of the present invention employs a flat, movable sensitive screen having a number of openings or apertures. The image of an original is once formed on the sensitive screen as an electrostatic latent image. With the use of the thus formed image on the sensitive screen, another electrostatic latent image is formed on a recording paper while the screen is stationary. The recording paper is then passed through a developing means and a fixing means provided in the copying machine and discharged out to a tray. The electrostatic latent image formed on the sensitive screen may be used repetitively for obtaining multiple reproductions.

Abstract: In an electrophotographic copying machine of the type which transfer an electrostatic latent image formed on a photosensitive element, usually comprising a conductive base and a photoconductive layer thereon, onto a recording member, an electric dust collector is provided to clean the air flowing in the vicinity of a corona discharger and the photosensitive member. In order to direct the dust-free air, there is provided an air flow passage and a blower such as a fan. The corona discharger and the electric dust collector may be constructed integrally or separately. All of the air in the copying machine may be made dust-free.

Abstract: An electrostatic copying machine comprises a photosensitive screen having a number of fine openings therein, means for forming on the screen a primary electrostatic latent image corresponsing to an original image, an electrostatic attracting device for electrostatically attracting a recording material and moving said recording material in facing relationship with the surface of the screen on which the latent image is formed, a device for supplying the recording material to the electrostatic attracting device, and means for forming a secondary electrostatic latent image on the recording material conveyed by the attracting device.