Image formation method
AssigneeCanon Kabushiki Kaisha
InventorsYujiro Ando, Yukimasa Shinohara, Katsunobu Ohara
Life of this patent
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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.
Claims30
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.
An image formation method according to claim 13, wherein said one member is drum-shaped.
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.