Claims
- 1. An image formation method for forming an image on an image reception member by modulating an ion flow or charge particles at a modulating position with the aid of a screen member having a number of fine passage openings, wherein said screen member and said reception member each have an arcuate cross-section at the modulating position and a different radius of curvature, said method comprising:
- forming a primary image on said screen member;
- forming a secondary image on said image reception member with ion flow or charged particles modulated by the primary image; and
- rotating or moving, during modulation, said screen member and said image reception member at different peripheral speeds at the modulating position, the peripheral speed of the member having the larger radius of curvature being greater than the peripheral speed of the other member, whereby a sharp secondary image corresponding to the primary image is formed on said image reception member.
- 2. A image formation method according to claim 1, wherein said screen member and said image reception member are drums having different radii.
- 3. An image formation method according to claim 13, wherein said one member is drum-shaped.
- 4. An image formation method for forming an image on an image reception member by modulating an ion flow or charged particles at a modulating position with the aid of a screen member having a number of fine passage openings, wherein at least one of said members has an arcuate cross-section at the modulating position, said method comprising:
- forming a primary image on said screen;
- forming a secondary image on said image reception member with an ion flow or charged particles modulated by said primary image; and
- setting the velocities of rotation or movement (v.sub.1,v.sub.2) of said screen and said image reception member, during modulation, at the modulating position substantially to V.sub.2 /V.sub.1 ={h.sup.2 -(.vertline.f.vertline.-r.sub.2).sup.2 }/{h.sup.2 -(.vertline.e.vertline.-r.sub.1).sup.2 }, where (h,o) and (-h,o) are the polar positions, as viewed in the Descartes coordinates, of dipole coordinates having coordinate planes coincident with said screen and said image reception member at the modulating position, and (e,o), (f,o) r.sub.1 and r.sub.2 are the coordinates of the centers and curvature radii of said screen and said image reception member, wherein O<r.sub.1 .ltoreq..infin., O<r.sub.2 .ltoreq..infin. and r.sub.1 .noteq.r.sub.2.
- 5. An image formation method according to claim 4, wherein said screen is smaller in radius than said image reception member and the image formed on said screen is reduced in the direction of rotation or movement.
- 6. An image formation method according to claim 4, wherein if said screen is larger in radius than said image reception member, the image formed on said screen is enlarged in the direction of rotation or movement.
- 7. An image formation method according to claim 5, wherein said screen is drum-shaped and said image reception member is planar and v.sub.2 /v.sub.1 equals h.sup.2 /{h.sup.2 -(.vertline.e.vertline.-r.sub.1).sup.2 }.
- 8. An image formation method according to claim 6, wherein said screen is planar and said image reception member is drum-shaped and v.sub.2 /v.sub.1 equals {h.sup.2 -(.vertline.f.vertline.-r.sub.2).sup.2 }/h.sup.2.
- 9. An image formation method for forming an image on an image reception member by modulating an ion flow or charged particles at a modulating position with the aid of a screen member having a number of fine passage openings, wherein both members are drum shaped, said method comprising:
- forming a primary latent image on said screen member;
- then forming a secondary latent image on said reception member with an ion flow or charged particle modulated by said primary latent image; and
- rotating, during modulation, said screen member and said image reception member at different peripheral speeds at the modulation position, the peripheral speed of the member having the larger radius of curvature being greater than the speed of the other member, whereby a sharp secondary latent image corresponding to the primary latent image is formed on said image reception member.
- 10. An image formation method according to claim 9, wherein the velocities of rotation or movement (v.sub.1,v.sub.2) of said screen member and said image reception member at the modulating position are substantially set to v.sub.2 /v.sub.1 ={h.sup.2 -(.vertline.f.vertline.-r.sub.2).sup.2 }/{h.sup.2 -(.vertline.e.vertline.-r.sub.1).sup.2 }, where (h,o) and (-h,o) are the polar positions, as viewed in the Descartes coordinates, of dipole coordinates having coordinate planes coincident with said screen member and said image reception member at the modulating position, and (e,o), (f,o), r.sub.1 and r.sub.2 are the coordinates of the centers and curvature radii of said screen member and said image reception member.
- 11. An image formation method according to claim 10, wherein the primary latent image on said screen member is changed in its magnification in the direction of movement of said screen member and the ion flow is modulated by the so changed primary latent image to thereby prevent the secondary latent image from being changed in the direction of rotation.
- 12. An image formation method according to claim 11, wherein image exposure means for said screen member is provided to change the magnification of said primary latent image.
- 13. An image formation method for forming an image on an image reception member by modulating an ion flow or charged particles at a modulation position with the aid of a screen member having a number of fine passage openings, wherein one of said members has an arcuate cross-section at the modulation position while the other member has a linear cross-section, said method comprising:
- forming a primary image on said screen member;
- forming a secondary image on said image reception member with ion flow or charged particles modulated by said primary image; and
- rotating or moving, during modulation, said screen member and said image reception member at different relative speeds at the modulating position, the peripheral speed of said one member being less than that of said other member, whereby a sharp secondary image corresponding to the primary image is formed on said image reception member.
- 14. An image formation method for forming an image of an original on an image reception member by modulating an ion flow or charged particles at a modulating position with the aid of a screen-shaped photosensitive member, wherein said screen member and said image reception member form, at said modulating station, have arcuate cross-sections having radii r.sub.1 and r.sub.2, respectively, where r.sub.1 .noteq.r.sub.2, O<r.sub.1 .ltoreq..infin., O<r.sub.2 .ltoreq..infin., said method comprising:
- forming a primary image on said screen member;
- forming a secondary image on said image reception member with an ion flow or charged particles modulated by the primary image; and
- rotating or moving, during modulation, said screen member and said image reception member at different peripheral speeds at the modulating position, the peripheral speed of the member having the larger radius of curvature being greater than the peripheral speed of the other member, whereby a sharp secondary image corresponding to the primary image is formed on said image reception member.
- 15. An image formation method according to claim 14, wherein the primary latent image on said screen member is changed in its magnification in the direction of rotation or movement of said screen member and the ion flow or the charged particles are modulated by the so changed primary latent image to thereby prevent the secondary latent image from being changed in its magnification with respect to the image of the original in the direction of rotation or movement.
- 16. An image formation method according to claim 15, wherein said screen member is smaller in radius than said image reception member, and the primary image formed on said screen member is reduced in the direction of rotation or movement.
- 17. An image formation method according to claim 15, wherein image exposure means for said screen member is provided to change the magnification of said primary latent image.
- 18. An image formation method according to claim 14, wherein said image reception member is a sheet member, and the secondary image formed on the sheet member is developed by developing means, and then fixed by fixing means.
- 19. An image formation method according to claim 14, wherein said image reception member is a drum member, and said secondary image formed on the drum member is developed by developing means, and then transferred onto a transfer material, whereafter said drum member is cleaned by cleaning means to be used repeatedly.
- 20. An image formation method according to claim 14, wherein the peripheral speed of said screen member is different from the scanning speed of the original, when the primary image is formed.
- 21. An image formation method according to claim 20, wherein the scanning of the original is effected by moving an original carriage for carrying the original.
- 22. An image formation method according to claim 21, wherein the speed of movement of said original carriage is higher than the peripheral speed of said screen member, when the radius r.sub.1 <the radius r.sub.2.
- 23. An image formation method according to claim 14, wherein said screen member comprises at least a conductive member with a number of fine passage openings and a photoconductive layer, and wherein said primary image is formed at least by the steps of electrically charging said screen member and applying a light image of the original to said screen member.
- 24. An image formation method according to claim 14, wherein said screen member comprises a conductive member with a number of fine passage openings, a photoconductive layer, and an insulating surface layer, and wherein said primary image is formed by the steps of applying a first corona to said screen member, applying a second corona and a light image of the original to said screen member either simultaneous or in succession and then uniformly exposing said screen member to light.
- 25. An image formation method according to claim 1 or 14, wherein said screen member and said reception member are each movable about a separate central axis.
- 26. An image formation method according to claim 15, wherein said screen member is larger in radius than said image reception member, and the image formed on said screen member is enlarged in the direction of rotation or movement.
- 27. An electrographic process comprising using a screen-shaped photosensitive body composed of at least one electric conductive layer and photoconductive layer, uniformly charging said photoconductive layer, illuminating said screen-shaped photosensitive body with a light image corresponding to a picture image of a manuscript to be recorded so as to form an electrostatic latent image on said photoconductive layer, directing a flow of corona ions through said screen-shaped photosensitive body toward a dielectric coated image receiving body and controlling said flow of corona ions by said electrostatic latent image to form, on said dielectric coated image receiving body, an electrostatic charge image corresponding to an image to be recorded, said process comprising a further step of making a radius of curvature of said screen-shaped photosensitive body different from that of said dielectric coated image receiving body, arranging these two bodies in opposed and spaced apart relation and driving said two bodies at surface speeds which are different from each other.
- 28. An electrophotographic process as claimed in claim 27, wherein a manuscript scanning speed is made different from a moving speed of said screen-shaped photosensitive body and a cylindrical convex lens for changing a projection magnification in the manuscript scanning direction only is arranged in an optical system for projecting a manuscript picture image on said screen-shaped photosensitive body.
- 29. An electrographic process as claimed in claim 27, wherein a manuscript scanning speed is made different from a surface speed of said screen-shaped photosensitive body and a cylindrical lens for changing a projection magnification in the manuscript scanning direction only is arranged in an optical system for projecting a manuscript picture image on said screen-shaped photosensitive body.
- 30. An electrographic process according to claim 27, wherein said photosensitive body and said image receiving body are each movable about a separate central axis.
Priority Claims (1)
Number |
Date |
Country |
Kind |
50/83752 |
Jul 1975 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 700,850 filed June 29, 1976, now abandoned.
US Referenced Citations (4)
Continuations (1)
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Number |
Date |
Country |
Parent |
700850 |
Jun 1976 |
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