Abstract: A stencil printing master is provided that includes a porous fiber layer, and a porous resin layer formed on one surface of the porous fiber layer. The porous resin layer includes a thermoplastic resin having a ratio (G1/G2) of a storage modulus (G1) at 45° C. to a storage modulus (G2) at 180° C. of 1×102 to 1×104, and a peak melting temperature by DSC of 50° C. to 150° C. There is also provided a process for producing the stencil printing master.

Abstract: A semiconductor memory device, having at least one floating gate, includes a semiconductor substrate; at least one device-isolation region buried in the semiconductor substrate, having a top surface protruding from a top surface of the semiconductor substrate, the top surface of the device isolation region having a concave section that has a depression thereon; at least one gate-insulating film formed on the semiconductor substrate; a first gate formed on the gate-insulating film, the device-isolation region and the depression; a gate-to-gate insulating film formed on the first gate and in the concave section and the depression of the device-isolation region; and a second gate formed on the gate-to-gate insulation film, the depression being filled with the second gate.

Abstract: A stencil printing machine having an exfoliation suction apparatus including a case having a guide plate at its upper face, a suction force generating portion provided at the case and an exfoliation suction port provided at one end portion of the guide plate for constituting suction force for exfoliating print sheet from a printing drum by suction force by the suction force generating portion in which the exfoliation suction port is arranged to be proximate to a press roller orthgonally to a center line of a squeegee roller intersecting with an axis line of the printing drum and on a lower side of a reference line passing through a position of bringing the press roller and into press contact with the printing drum.

Abstract: A microporous stencil sheet for use in stencil printing and methods for making stencil master using this microporous stencil sheet are disclosed herein. The microporous stencil sheet is for use in stencil printing using a low-viscosity ink with a viscosity ranging from 0.001 to 1 Pa·s, comprises an inelastic resin film and has an air permeability ranging from 1 to 600 seconds and a thickness ranging from 1 to 100 &mgr;m. The methods for making stencil master using this microporous stencil sheet comprise the step of closing the micropores of the stencil sheet in a non-printing portion of a desired printed image.

Abstract: A semiconductor memory device having a side wall insulation film, comprises a first memory cell located on an active area of a semiconductor substrate, the first memory cell having a first gate electrode, a first source electrode and a first drain electrode; a second memory cell located on the semiconductor substrate, the second memory cell being apart from the first memory cell in a first distance and having a second gate electrode, a second source electrode and a second drain electrode; a silicon nitride layer formed above the first and second memory cells to cover the first and the second memory cells, a proportion of a thickness of the silicon nitride layer formed on a side surface of one of the first and second gate electrodes to the first distance between the first and the second memory cells being more than 0% and 15% or less.

Abstract: A microporous stencil sheet for use in stencil printing and methods for making stencil master using this microporous stencil sheet are disclosed herein. The microporous stencil sheet is for use in stencil printing using a low-viscosity ink with a viscosity ranging from 0.001 to 1 Pa•s, comprises an inelastic resin film and has an air permeability ranging from 1 to 600 seconds and a thickness ranging from 1 to 100 &mgr;m. The methods for making stencil master using this microporous stencil sheet comprise the step of closing the micropores of the stencil sheet in a non-printing portion of a desired printed image.

Abstract: The invention relates a source sheet for stencil printing comprising: a porous support material; a porous resin film formed on a surface of the porous support material;

Abstract: A micro porous plastic sheet is stencil plate made by a method for stencil plate making of a stencil sheet for stencil printing under the following conditions: heat is provided to form a negative image with TPH at −30≦Tp−Tm≦300° C. (Tp is heating peak temperature and Tm is melting temperature (melting point) of the sheet) and in 10≦To×100/Ts≦80% (To is current-carrying time period and Ts is current-carrying cycle), micro pores are closed by the pressure for stencil plate making of 0.1≦P≦1.0 MPa, and the thermal shrinkage rate of the sheet measured by TMA is set to 1≦STm-30≦20% (STm-30 is a thermal shrinking rate of the sheet at a temperature 30° C. lower than the melting point TM).

Abstract: A semiconductor memory device having at least one floating gate includes a semiconductor substrate; at least one device-isolation region buried in the semiconductor substrate, having a top surface protruding from a top surface of the semiconductor substrate, the top surface of the device-isolation region having a concave section that has a depression thereon; at least one gate-insulating film formed on the semiconductor substrate; a first gate formed on the gate-insulating film, the device-isolation region and the depression; a gate-to-gate insulating film formed on the first gate and in the concave section and the depression of the device-isolation region; and a second gate formed on the gate-to-gate insulation film, the depression being filled with the second gate.

Abstract: A stencil printing machine having an exfoliation suction apparatus including a case having a guide plate at its upper face, a suction force generating portion provided at the case and an exfoliation suction port provided at one end portion of the guide plate for constituting suction force for exfoliating print sheet from a printing drum by suction force by the suction force generating portion in which the exfoliation suction port is arranged to be proximate to a press roller orthgonally to a center line of a squeegee roller intersecting with an axis line of the printing drum and on a lower side of a reference line passing through a position of bringing the press roller and into press contact with the printing drum.

Abstract: A microporous stencil sheet for use in stencil printing and methods for making stencil master using this microporous stencil sheet are disclosed herein. The microporous stencil sheet is for use in stencil printing using a low-viscosity ink with a viscosity ranging from 0.001 to 1 Pa•s, comprises an inelastic resin film and has an air permeability ranging from 1 to 600 seconds and a thickness ranging from 1 to 100 &mgr;m. The methods for making stencil master using this microporous stencil sheet comprise the step of closing the micropores of the stencil sheet in a non-printing portion of a desired printed image.

Abstract: An ink supplying roller (17) is disposed in a rotary cylindrical drum (16), and is moved so that the ink supplying roller (17) can be brought into contact with an inner peripheral surface of a cylindrical circumferential wall (15). The ink supplying roller (17) is placed at a contact position with an ink permeable portion (15a) of the circumferential wall (15). The rotary cylindrical drum (16) is rotated in a state in which a stencil sheet (M) is not wound around the rotary cylindrical drum (16). Therefore, ink (50) drawn out through the ink permeable portion to the outer peripheral surface of the circumferential wall (15) because the stencil sheet (M) is peeled off at the stencil discharging operation is pulled into the ink permeable portion of the circumferential wall (15) by negative pressure produced by the ink supplying roller (17) coming in contact with the inner peripheral surface of the circumferential wall (15) and is removed.

Abstract: A micro porous plastic sheet is stencil plate made by a method for stencil plate making of a stencil sheet for stencil printing under the following conditions: heat is provided to form a negative image with TPH at −30≦Tp−Tm≦300° C. (Tp is heating peak temperature and Tm is melting temperature(melting point) of the sheet) and in 10≦To×100/Ts≦80% (To is current-carrying time period and Ts is current-carrying cycle), micro pores are closed by the pressure for stencil plate making of 0.1≦P≦1.0 MPa, and the thermal shrinkage rate of the sheet measured by TMA is set to 1≦STm−30≦20% (STm−30 is a thermal shrinking rate of the sheet at a temperature 30° C. lower than the melting point TM).

Abstract: A heat-sensitive stencil master making apparatus for making a stencil master by imagewise perforating thermoplastic film of heat-sensitive stencil master material according to an image on an original includes a thermal head which has an array of a plurality of heater elements and is brought into thermal contact with the thermoplastic film. Heater elements selected from the array of the heater elements according to the image on the original are applied with an electric voltage so that perforations are formed in the parts of the thermoplastic film of the heat-sensitive stencil master material in contact with the selected heater elements.

Abstract: Disclosed is a heat-sensitive sheet for stencil printing comprising a laminate of a thermoplastic resin film and a porous support mainly composed of synthetic fibers, the sheet having a wet tensile strength in the machine direction of 200 gf/cm or higher, a KES bending rigidity B value in the machine or cross direction of 0.02 g·cm2/cm or higher, and a PPS smoothness determined when a film is pressed against the surface of the porous support of the sheet of 0.9 &mgr;m or higher; the sheet has an excellent runnability, occurrence of wrinkles on the sheet when it is wound around a drum of a stencil printing machine is efficiently prevented, and elongation of the sheet is repressed and occurrence of wrinkles on the sheet can be prevented even when a large number of paper sheets are printed, and thus printed paper sheets having sharp images excellent in reproducibility of a manuscript can be provided.

Abstract: An ink supplying roller (17) is disposed in a rotary cylindrical drum (16), and is moved so that the ink supplying roller (17) can be brought into contact with an inner peripheral surface of a cylindrical circumferential wall (15). The ink supplying roller (17) is placed at a contact position with an ink permeable portion (15a) of the circumferential wall (15). The rotary cylindrical drum (16) is rotated in a state in which a stencil sheet (M) is not wound around the rotary cylindrical drum (16). Therefore, ink (50) drawn out through the ink permeable portion to the outer peripheral surface of the circumferential wall (15) because the stencil sheet (M) is peeled off at the stencil discharging operation is pulled into the ink permeable portion of the circumferential wall (15) by negative pressure produced by the ink supplying roller (17) coming in contact with the inner peripheral surface of the circumferential wall (15) and is removed.

Abstract: A semiconductor device comprising, a semiconductor substrate, a first gate insulator film formed on the semiconductor substrate, a floating gate formed on the first gate insulator film, a second insulator film formed on the floating gate, a control gate formed on the second insulator film, and a silicon film doped with nitrogen and an impurity, and interposed between the floating gate and the second gate insulator film and/or between the second gate insulator film and the control gate.