Abstract: A recording apparatus is disclosed comprising a recording head adapted to hold fusible ink, a transfer member facing the recording head without contacting it, heating means for heating the transfer member to a predetermined temperature, pressure applying means facing the transfer member in such a way that a recording medium can pass therebetween and cooperating with the transfer member for applying pressure to the recording medium, and voltage applying means for applying a voltage between the recording head and the transfer member, the recording head supplying the fusible ink in a molten state to the transfer member, the predetermined temperature being higher than the softening point of the ink and lower than the melting point of the ink, and the transfer member comprising materials having a surface energy approximately equal to the value of the critical surface tension of the ink and smaller than the surface energy of the recording medium.

Abstract: A display medium is disclosed, comprising at least the following layers, in this order: a heating resistive layer, a conductive layer, a background layer and an erasable thermochromic layer, and comprising a heating resistive layer which may comprise at least two layers. The display medium may also comprise a contact resistance reducing layer on the heating resistive layer and a protective layer on the erasable thermochromic layer.

Abstract: An ink transfer medium for toner is disclosed, comprising the following layers, in this order: a heat-generating resistive layer heated by input of electrical signal, a conductive layer, and an ink release layer having a toner layer on it, an adhesion from 0.2 g/mm to 40 g/mm as measured by the 90.degree. peeling off method and consisting of a viscoelastomer having a critical surface tension of 35 dyne/cm or less. It can be re-inked by attaching toner to the portions of the ink transfer medium from which the ink has been removed, using toner held in a toner holding means.

Abstract: A first negative or positive latent electrostatic image is formed on a latent image bearing body with a first writing device, and developed with a monochromatic toner. A second latent image of the type different than the first latent image is formed by a second writing device after setting the background voltage of the second image to have an absolute value larger than the first image, and then developed with one or two color toners selected from three color toners of respective multi-color developing units. A plurality of multi-color toner images may be formed in respective rotation cycles of the latent image bearing body. A monochromatic toner image may be formed in the same rotation cycle as one of the multi-color toner images. Finally, a plurality of toner images thus produced are transferred onto a recording sheet at once after polarities of the plurality of toner images have been arranged into the same polarity.

Abstract: In a method of regenerating an ink image recording medium of a multilayered structure, after an ink image on the ink image recording medium is recorded, the surface of the heat-fusible ink layer of the ink image recording medium is uniformly charged. Then, a liquid ink for generating the ink layer, being placed under an electric field applied thereto, is supplied to the ink image recording medium. The liquid ink is prepared by dispersing heat-fusible ink powder into a liquid dispersion medium. As a result, the heat-fusible ink powder selectively sticks onto the portion on the ink release layer where the heat-fusible ink layer is absent because the ink was transferred. Finally, the ink image recording medium thus processsed is dried to remove the liquid dispersing medium.

Abstract: An image forming method of the present invention comprises: a first toner image formation process for forming a first toner image by forming, on a latent image carrier, a first latent image which corresponds to a first image and developing the first latent image by a first toner charged to one polarity through a development process selected from normal and reverse development process selected from normal and reverse development processes so as to correspond to the polarity of the first toner; a second toner image formation process for forming a second toner image by forming, on the latent image carrier, a second latent image which correspond to a second image and developing the second latent image by a second toner charged to the other polarity by the other development process while applying a developing bias; and a transfer treatment process for simultaneously transferring said first and second toner images to a transfer medium; wherein said developing bias VB2 satisfies the following equations:.vertline.

Abstract: An image forming method of the present invention comprises: a first toner image formation process for forming a first toner image by forming, on a latent image carrier, a first latent image which corresponds to a first image and developing the first latent image by a first toner charged to one polarity through a development process selected from normal and reverse development process selected from normal and reverse development processes so as to correspond to the polarity of the first toner; a second toner image formation process for forming a second toner image by forming, on the latent image carrier, a second latent image which correspond to a second image and developing the second latent image by a second toner charged to the other polarity by the other development process while applying a developing bias; and a transfer treatment process for simultaneously transferring said first and second toner images to a transfer medium; wherein said developing bias VB2 satisfies the following equations:.vertline.

Abstract: A latent color image developing system for copying a document having a first color images and second color images develops the first color images with a first color developer and the second color images with a second color developer. The second color developer includes a toner and a magnetic carrier having a density of less than 4.0 g/cm.sup.3 and a particle size in the range of 30-50 microns. A developer roll is used having a main developing pole with a flux density of more than 500 gauss in a nip region proximate a photosensitive member having latent electrostatic images to be developed.

Abstract: A cooling structure for cooling integrated circuits. The cooling structure includes integrated circuit cases inside which one of more integrated circuits are mounted. Cold plates are also included which are superimposed on heat radiation surfaces of the integrated circuit cases, respectively, the cold plates each having one end of which is bent. Pressing members are also included which are superimposed on the cold plates, respectively, the pressing members each having one end of which is bent to oppose the bent one end of a respective one of the cold plates. The cooling structure also includes fixing means which fixes each of the cold plates and a corresponding one of the pressing members to corresponding one or more of the integrated circuit cases in a freely detachable manner. The cooling structure also includes cooling pipes with each of the cooling pipes being held in at least one space formed between one end of at least one of the cold plates and one end of a corresponding one of the pressing members.

Abstract: An apparatus for testing performances of a screw consisting of a bolt and a nut in the plastic region under loading of an external force as well as in the elastic region. The apparatus comprises a load cell adapted for detecting thread torque, bearing torque, clamping torque and axial tension, nut tightening apparatus, apparatus for generating external force to be applied to the sample screw and an extensometer adapted for detecting twist angle and elongation of the bolt and revolution angle of the nut.

Abstract: In electrostatic latent image developing process capable of effecting either positive or negative reproduction a magnetic toner of a high resistivity is controlled to form a magnetic brush having a potential insufficient for development. The toner chain constituting the brush is separated under the influence of an electric field between the developing roll and the image carrier, to produce toner particles having one polarity continuing with the developing roll, and particles of the opposite polarity transferred to the carrier.

Abstract: Heat-sensitive recording sheet comprising in a heat-sensitive color forming layer a colorless basic dyestuff and 4-isopropoxy-4'-hydroxydiphenyl sulfone as organic developer, wherein said color forming layer contains as sensitizer one of the compounds represented by the following formula (II) or (III): ##STR1## where, in the general formula (II) and (III), A represents a hydrogen atom, halogen atom, nitro group, lower alkyl group, lower alkoxy group or hydroxy group, l represents an integer from 1 to 5 and m represents an integer from 0 to 3. The sheet provides high density images and excellent stability of images.

Abstract: Heat-sensitive recording sheet comprising a base sheet and a color-forming layer including a colorless basic dyestuff and a mono-phenolic 4-hydroxyphenyl compound which is reactive with said dyestuff by heating, wherein said color-forming layer comprises a metal salt of p-alkylbenzoic acid or a metal salt of o-benzoylbenzoic acid (having a particular formula). The sheet provides superior stability against contamination with oily substances while keeping excellent fundamental qualities thereof.