Abstract: This invention relates to a method or apparatus capable of displaying a high-quality image using a reversible image display medium which can be repeatedly used and in which a cell(s) formed between two substrates accommodates at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities; an electric field is applied to the developing particles for performing image display; in image display, the electric field strength of, e.g., 0.3 V/&mgr;m to 3.0 V/&mgr;m is applied to the developer; an oscillating force (e.g.

Abstract: A non-fixing type image receiving sheet to which toner particles are made adhere in a removable manner and an image forming apparatus. The image receiving sheet has a large number of concave portions accepting toner particles and a large number of convex portions protecting toner particles are formed on a surface of the image receiving sheet. The image forming apparatus has a sheet charging apparatus which charges the surface of the image receiving sheet to a polarity opposite to a charged polarity of toner particles, in advance of a transferring process.

Abstract: The invention provides a reversible image display medium accommodating a dry developer in each cell formed between two substrates. The developer contains at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities. An image display can be achieved by forming an electrostatic latent image on one of the substrates to drive the developing particles in an electric field based on the electrostatic latent image. The developing particles are set to an average charge quantity of 1.0 &mgr;C/g to 10 &mgr;C/g to achieve good image display. Optionally at least one kind of the developing particles are magnetic developing particles having a coercive force of 50 oersteds to 250 oersteds, and optionally having an optical reflection density of 1.0 or more.

Abstract: Disclosed is a reversible image display medium which can be repeatedly used and can display high quality images, in which cells between the two substrates accommodate a dry developer containing at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities; images are displayed by forming an electrostatic latent image corresponding to the image to be formed on one of the two substrates to drive the developing particles in an electrostatic field based on the electrostatic latent image; a developer-facing surface of one of the substrates has a surface resistivity of at least 1×1012 ohm/square; a developer-facing surface of the opposite substrate has a surface resistivity from 1×106 ohm/square to 1×1012 ohm/square; a developer-facing surface of one of the substrates has a surface average median roughness Ra of 0.2 &mgr;m to 0.

Abstract: A method of controlling an image forming apparatus having a first image forming portion for forming an image on a normal image display medium and a second image forming portion for forming an image on a reversible image display medium, comprising the steps of:

Abstract: An image forming apparatus including a first image forming portion for forming an image on a normal image display medium; a second image forming portion for forming an image on a reversible image display medium; and a medium type detecting device for detecting the type of the image display medium to be subjected to the image formation, wherein the image forming portion corresponding to the image display medium of the type detected by the medium type detecting device is allowed to perform the image formation when the medium type detecting device detects the image display medium of the same type as that selected by an operator, and inhibition of the image formation on the medium of the detected type, image formation on the image display medium of another type or discharge of the medium of the detected type without image formation is performed when the detected type is different from the selected type.

Abstract: An image forming apparatus is provided which forms images on both a concavo-convex sheet having a concavo-convex surface on which is formed many concavities capable of receiving toner and from which toner can be removed, and a general-purpose sheet which is not specially processed. The image forming apparatus has a first mode for forming an image on a general-purpose sheet, and a second mode for forming an image on a concavo-convex sheet. In the first mode, a general-purpose sheet receives a transferred toner image in the image forming region, and thereafter is guided to a fixing unit, where the toner is fixed on the sheet. In the second mode, a concavo-convex sheet receives a transferred toner image in the image forming region, and thereafter does not pass through the fixing unit but is guided to a convexity cleaning unit, where toner adhered to the convexities of the concavo-convex sheet during transfer is removed.

Abstract: A reversible image display medium including two sheets; one or more developer accommodating cells formed between the two sheets, and each having a periphery surrounded by a partition wall; and dry developer contained in each of the cell(s), wherein the dry developer contains at least two kinds of frictionally chargeable dry developer particles having different chargeable polarities and different optical reflection densities. The image is displayed by forming a predetermined electrostatic field for each pixel in accordance with the image to be displayed and thereby moving the developer particles in a frictionally charged state. The image formed on the reversible image display medium can be erased, e.g., by an image erasing device.

Abstract: A reversible image display medium including two sheets; one or more developer accommodating cells formed between the two sheets, and each having a periphery surrounded by a partition wall; and dry developer contained in each of the cell(s), wherein the dry developer contains at least two kinds of frictionally chargeable dry developer particles having different chargeable polarities and different optical reflection densities. The image is displayed by forming a predetermined electrostatic field for each pixel in accordance with the image to be displayed and thereby moving the developer particles in a frictionally charged state. The image formed on the reversible image display medium can be erased, e.g., by an image erasing device.

Abstract: An image forming apparatus including first and second image forming portions, and a device for detecting a type of an image display medium, image formation by the first image forming portion being allowed when the medium type is a normal image display medium (PP), and image formation by the second image forming portion being allowed when the medium type is a reversible image display medium (TP). Another image forming apparatus including first and second image forming portions, and an image formation element setting switching device, image forming elements being set in a standard mode to a standard state for forming an image on a medium for the standard mode, and being switched in a non-standard mode to a non-standard state for forming an image on a medium for the non-standard mode.

Abstract: This invention provides a reversible image display medium comprising two substrates opposed to each other with a predetermined gap therebetween, one or more developer-accommodating cells formed between the two substrates, and a dry developer accommodated in each cell, in which the dry developer contains at least two kinds of frictionally chargeable dry developer particles having different chargeable polarities and different optical reflection densities, the reversible image display medium having at least any of the following features:

Abstract: An image forming apparatus including a first image forming portion for forming an image on a normal image display medium, and a second image forming portion for forming an image on a reversible image display medium.

Abstract: A reversible image display medium including two sheets; one or more developer accommodating cells formed between the two sheets, and each having a periphery surrounded by a partition wall; and dry developer contained in each of the cell(s), wherein the dry developer contains at least two kinds of frictionally chargeable dry developer particles having different chargeable polarities and different optical reflection densities. The image is displayed by forming a predetermined electrostatic field for each pixel in accordance with the image to be displayed and thereby moving the developer particles in a frictionally charged state. The image formed on the reversible image display medium can be erased, e.g., by an image erasing device.

Abstract: A liquid developer transfer device disposed between a reservoir accommodating a liquid developer having a fluid medium and electrically charged toner particles dispersed therein and an electrostatic latent image carrying member, which performs toner transfer by repeating electrodeposition.

Abstract: A liquid-type developing device for use in an image forming apparatus such as a copying machine or printer, that develops an electrostatic latent image formed on a latent image holding member using a liquid-type developer. In the liquid-type developing device, a developer carrying member supplies the liquid-type developer to the surface of the electrostatic latent image carrier at a developing region, and a removing member removes residual liquid-type developer remained on the surface of the developer carrying member after development.Before removing the residual liquid-type developer remained by the removing member, a fluid supplying member supplies a fluid on the surface of the developer carrying member so that the removing member removes said residual liquid-type developer with said fluid.

Abstract: A developing sleeve rotary type magnetic brush developing apparatus which includes a developing sleeve having a magnet member with magnetic poles in it, an insulative layer provided on the surface of the developing sleeve, and a toner supply roll disposed for rotation in the vicinity of the developing sleeve. The toner supply roll is arranged to be formed with a thin charged toner layer on its surface, with an A.c. voltage of 0.5 to 3 kV, and 50 Hz to 3 kHz being impressed between the toner supply roll and the developing sleeve.

Abstract: An electrophotographic copying apparatus or copier equipped with an improved fixing arrangement for electrostatically transferring original images onto a copy paper continuously fed from a roll. A heat source including reflectors and a cooling system provided for the fixing arrangement are both arranged to be retracted from their operational positions to stand-by positions when a copying process is interrupted or completed.In the stand-by positions the heat source is covered by heat insulating material, so that heat from the heat source will not be transmitted to other elements inside the copier during the stand-by mode.

Abstract: Electrophotocopying machine in which colored photocopies are produced by successive production and transfer onto copy paper of different color component portions of an original document, and the exposure mechanism for production of each colored component portion employs an optical fiber bundle and an odd number of mirrors, whereby the construction is made more compact and copy paper may be moved in the same direction as an original document, thus facilitating synchronization of movement to ensure correct matching of different component portions of an image at different transfer stations. To further ensure correct matching despite use of different types of copy paper, there is provided a device for adjusting the length of the path over which copy paper is transported between transfer stations.

Abstract: An electrophotographic copying apparatus which is equipped with an improved arrangement for removing jammed copy paper. The apparatus is provided with a photoreceptor and a developing device combined into one unit which can be withdrawn to provide sufficient space for removing jammed copy paper, and is also provided with copy paper transporting members, a corona charger, a transfer charger, a copy paper separating claw etc. which can be moved away from a transfer section in one operation for facilitating access to the jammed copy paper in an efficient manner in the case of copy paper jamming. The transfer charger is covered when it is moved away from the transfer section to protect it from possible damage.

Abstract: An electrophotographic copying apparatus of the slit exposure type which includes a scanning box having image forming elements such as a photoreceptor drum, a corona charger, an optical system, and a transfer member, etc. incorporated therein. The photoreceptor drum is rotated in synchronization with the movement of the scanning box, while copy paper is transported by the direction of movement of the scanning box at a speed equivalent to the sum of the moving speed of the scanning box and the circumferential speed of the photoreceptor drum for causing the copy paper to contact the photoreceptor surface in synchronization with each other so that the image of an original formed on the photoreceptor surface is transferred onto the copy paper. The optical system includes an illuminating device which directs light rays toward the original being copied and also at a position on the photoreceptor surface following image transfer for erasing the residual charges remaining on the photoreceptor surface.