Abstract: A photosensitive sheet comprising a sheet-shaped substrate, one surface of which is coated with a light-reflective substance or which is made of a light-reflective substance, and pressure-rupturable capsules that coat the light-reflective surface of the substrate or the other surface of the substrate, the pressure-rupturable capsules containing chromogenic materials and photosensitive materials that are hardened when illustrated with light, and a method for the formation of images using the said photosensitive sheet.

Abstract: A method of soldering for surface mounting of a printed circuit board, which comprises performing reflow soldering with a rosin-based cream solder in a special atmospheric gas comprising an inert gas such as N.sub.2, Ar or He and containing about 10,000 ppm or less of oxygen and 0.5-3.0% of moisture is disclosed.

Abstract: A method for image formation comprising the steps of exposing a light-receiving sheet coated with a layer of microcapsules containing photopolymerization agent and colorless dye selectively to light so as to form a cured image thereon opposite in sense to the desired final image, laying an image-receiving sheet uniformly coated with a layer of a developing material for reacting with and coloring the colorless dye on the light-receiving sheet, heating the resulting sandwich configuration and pressing these sheets against each other thereby rupturing the uncured microcapsules to form a colored image.

Abstract: An image forming apparatus comprising an optical device for forming a latent image on a photo and pressure sensitive sheet coated with microcapsules in which at least a photocuring material and a dyestuff are enveloped, a pressure developing device for superposing the photo and pressure sensitive sheet on which the latent image is formed on an image receiving sheet and breaking uncured microcapsules by pressure to form images on the image receiving sheet through use of the dyestuff, a light source for irradiating light on the image receiving sheet developed by the pressure developing device and a discharge device for discharging the image receiving sheet on which the light from the light source is irradiated to the outside.

Abstract: A photosensitive member for electrophotography comprising a photoconductive layer formed on an electro- conductive support, in which the photoconductive layer is composed of an amorphous silicon germanium layer formed by electron cyclotron resonance (ECR) method and containing hydrogen and/or halogen in an amount of more than 40 at. % to 65 at. % and an amorphous silicon nitride layer formed by ECR method and containing hydrogen and/or halogen in an amount of more than 40 at. % to 60 at. %, the amorphous silicon nitride layer being laminated on the amorphous silicon germanium layer; said member exhibiting an increased sensitivity to laser rays having a long wavelength and an improved charge retention capacity.

Abstract: A photosensitive member for electrophotographic photoreceptor, composed of an amorphous silicon containing carbon; nitrogen or oxygen and a specific amount of hydrogen and/or halogen, prepared by electron cyclotron resonance method, which is useful for xerographic systems.

Abstract: A long life cleaning blade for image forming apparatus is formed of a rubber elastomer which contains, or has adhered on the surface thereof, an antistatic agent in an amount effective to prevent electrification.

Abstract: Before a photoreceptor for an electrophotographic image forming apparatus is uniformly charged at the beginning of a process for forming a latent electrostatic image thereon, the photoreceptor is exposed to charge-removing light for stabilizing the surface potential such that a high-quality image can be obtained. The level of exposure is modified in view of the fatigue and recovery characteristics of the photoreceptor. During a continuous operation of the photoreceptor, the level is logarithmically reduced. When the photoreceptor is started again after a rest period, the initial level of exposure is adjusted by logarithmically increasing it according to the length of the rest period as well as in view of the level of exposure prior to the rest period.

Abstract: A sheet-exposure stand supporting a photosensitive sheet on its sheet-placement surface, the photosensitive sheet being composed of a light-permeable substrate that is coated with pressure-rupturable capsules that contain chromogenic materials and photosensitive materials that are hardened when illuminated with light, and the sheet-placement surface being coated with or made of a light-reflective substance, and a method for the formation of images using the same.

Abstract: For an image formation apparatus having supplemental light sources in addition to an optical system for providing an image forming light beam reflected from an original to be copied, a control unit controls exposure by these supplemental light sources according to the photosensitivity characteristics of microcapsules of different kinds with which a light-receiving sheet is coated and which respond differently to individual beams from the supplemental light sources. The control unit may also be designed to take into consideration the effects of ambient humidity and the user's choice for particular coloring.

Abstract: An image forming apparatus such as a copier of the type using a light and pressure sensitive material to form a visible image by exposing photosensitive microcapsules to image forming light to thereby form an invisible pattern of selectively hardened microcapsules and pressing these microcapsules against a transfer sheet superposed thereon to rupture the microcapulses according to the pattern to effect chromogenic reactions selectively, is provided with a supplemental light source for exposing areas of the material not intended for forming an image such that unnecessary microcapsules in these areas do not cause stains on components of the apparatus.

Abstract: An image transfer device has a screening plate attached to and protruding from a paper guide so as to partially block the corona ion current from its transfer charger such that only the forward portion of an incoming transfer paper sheet already in contact with the surface of a photosensitive drum is exposed to the current. An elastic guide plate separated from the drum surface by only about 1 mm serves to allow transfer paper sheet of different stiffness to come into contact with the drum surfaces at a predetermined position.

Abstract: A discharging apparatus for use in a copying machine for discharging the photoreceptor layer laminated on a drum includes a short wavelength light source for producing a light having a wavelength shorter than 6000 angstrom, and a long wavelength light source for producing a light having a wavelength longer than 6200 angstrom. A control circuit is provided for controlling both light sources such that both light sources are turned on during at least one complete rotation of the drum before an exposure of a light image on the photoreceptor layer.

Abstract: A copying machine with a multiple transport function having a separation charger for separating from the photoreceptor surface copy paper with an image transferred thereon and a circulating transport passage formed from the paper discharge block to the paper feed block so that it is possible to select the single-sided copy mode for allowing the copy paper to be discharged outside the copying machine after the copying process, the duplex copy mode for allowing the copy paper undergoing one copying process to be led through the circulating transport passage to the copying process block as reversed, or the composite copy mode for allowing the copy paper undergoing one copying process to be led through the circulating transport passage to the copying process block without being reversed.

Abstract: Disclosed is a useful method of removing a charge from an electrophotographic photoreceptor provided with insulation layers on its surface by radiating light containing a minimum of 6,000 angstroms of peak wave length onto said photoreceptor simultaneously with a corona discharge. To realize this, a filter is applied so that light containing a minimum of 6,000 angstroms of peak wave length can be generated.