Abstract: A resistive heating element 30 has a higher molybdenum carbide content in a central portion 35 than in a peripheral portion 34. Since molybdenum carbides have a low temperature coefficient of resistance compared to molybdenum, the amount of heat generated in the central portion 35 of the resistive heating element 30 does not increase as much as in the peripheral portion 34 even when the temperature is increased, and the increase in difference in temperature between the peripheral portion 34 and the central portion 35 can be suppressed. In other words, generation of hot spots near the center can be suppressed and a good uniform heating property in a wide range of operation temperatures can be obtained.

Abstract: An electrical module assembly used in a surge arrester is manufactured by wrapping an electrical module assembly including at least one metal oxide varistor (MOV) disk to which a reinforcing structure including a pre-impregnated epoxy/glass-fiber composite has been applied with shrink film and compacting the wrapped electrical module assembly by heating the shrink film such that the shrink film shrinks and applies a radially compressive force to the electrical module assembly. The wrapped electrical module assembly then is cured at a temperature at which the shrink film no longer applies a compressive force.

Abstract: A method for manufacturing the same, wherein the monolithic ink-jet printhead includes a manifold for supplying ink, an ink chamber having a hemispheric shape, and an ink channel formed monolithically on a substrate; a silicon oxide layer, in which a nozzle for ejecting ink is centrally formed in the ink chamber, is deposited on the substrate; a heater having a ring shape is formed on the silicon oxide layer to surround the nozzle; a MOS integrated circuit is mounted on the substrate to drive the heater and includes a MOSFET and electrodes connected to the heater. The silicon oxide layer, the heater, and the MOS integrated circuit are formed monolithically on the substrate. Additionally, a DLC coating layer having a high hydrophobic property and high durability is formed on an external surface of the printhead.

Abstract: A bubble-jet type ink-jet printhead and manufacturing method thereof including a substrate integrally having an ink supply manifold, an ink chamber, and an ink channel; a nozzle plate having a nozzle on the substrate; a heater centered around the nozzle and an electrode for applying current to the heater on the nozzle plate; and an adiabatic layer on the heater for preventing heat generated by the heater from being conducted upward from the heater. Alternatively, a bubble-jet type ink-jet printhead may be formed on a silicon-on-insulator (SOI) wafer having a first substrate, an oxide layer, and a second substrate stacked thereon and include an adiabatic barrier on the second substrate. In the bubble-jet type ink-jet printhead and manufacturing method thereof, the adiabatic layer or the adiabatic barrier is provided to transmit most of the heat generated by the heater to ink under the heater, thereby increasing energy efficiency.

Abstract: In case of manufacturing a voltage non-linear resistor, a sintering process is divided into two completely separate steps, i.e. primary and secondary sinterings. The primary sintering is carried out under a reduced pressure and the second sintering is conducted under an atmospheric pressure with a sufficient amount of oxygen. The primary sintering is effects such that the relative density and open porosity of the primarily sintered body are 85% or more and 1% or less, respectively. The secondary sintering removes to a large extent, voids existing in the body and, oxidation of the body is sufficiently effected. Therefore, the finally sintered body has a high density, a large surge withstanding capability, and a high non-linearity index.

Abstract: A heavy duty PTC resistor with a pressed and sintered hollow cylindrical body of a ceramic composition which has two end faces in a radial plane with a connection contact on each end face.A heavy duty PTC resistor sintered body of a ceramic composition which has two end-faces carrying a connection contact; the invention also concerns a method of manufacturing such PTC-resistor.High duty PTC-resistors are required for some purposes. If for example a PTC-resistor is used as a starting device for a single-phase motor, it has to be designed to deal with almost the entire mains voltage and to carry power of 500 W or more. The usual cylindrical bodies, provided at their two end-faces with connection contacts, frequently exhibit cracks under loads of this kind.A high-duty PTC-resistor is thus known (German Patent Specification OS 1 465 349) which is made up of a stack of solid or hollow flat cylindrical discs, the end-faces of the superposed discs being interconncted by a contact layer.