Abstract: A pressure sensor has a stem in which a pressure introduction hole into which a pressure medium is introduced and a diaphragm deformable according to the pressure of the pressure medium are formed, and a strain detecting element which is arranged on the diaphragm via an insulating film and being configured to output a detection signal according to the deformation of the diaphragm. The strain detecting element is configured to have a portion made of polysilicon. A low doping layer having a higher electrical resistivity than polysilicon and a higher crystallinity than the insulating film is arranged between the insulating film and the strain detecting element.

Abstract: A servo motor control device includes a commanding section for outputting a move command signal to drive and control a plurality of servo motors. An interpolating section is provided for performing interpolation based on the move command signal output by the commanding section, and for outputting an interpolating signal based on that interpolation. The interpolating section is capable of performing circular arc interpolation when the commanding section outputs a circular arc move command signal. A distributing section outputs distribution pulse trains into each of the servo motors based upon the interpolating signal output by the interpolating section and an acceleration and deceleration time constant which is also received by the distributing section. The value of the acceleration and deceleration time constant is determined and adjusted by an acceleration and deceleration time constant determining section. The value of the acceleration and deceleration time constant is set to a predetermined initial value.

Abstract: A servo motor control device which performs suitable interpolation when given an external move command and for setting a target position on each coordinate axis is provided. The device comprises a revolution controller and a position detector for each axis of movement as well as a control gain controller. The revolution controller controls the number of revolutions of each of the servo motors involved using a control gain set individually for each coordinate axis and in accordance with a deviation between the current position of an object and a target position thereof. Based on control response delays which occur relative to each axis, the control gain controller changes a control gain individually set for each coordinate axis. In turn, the revolution controller controls the revolutions of each servo motor using the changed control gain. For any coordinate axis having no response delay, the control gain controller leaves a reference control gain unchanged.

Abstract: A molten metal heating method according to this invention employs a heater comprising: at least one heat evolving substance disposed in contact with a molten metal held in a container with one surface thereof; and an electrode disposed in contact with the other surface of the heat evolving substance but not in contact with the molten metal. With this arrangement, a voltage is applied between the electrode and the molten metal to flow an electric current in the heat evolving substance in thicknesswise thereof and causes the heat evolving substance to evolve heat to heat the heater at a high temperature. Thus, the heater heats the molten metal, and controls the temperature of the molten metal. As a whole, this invention improves the quality of metal products. In particular, the heater is less likely to be broken by the heat confinement in it, and can be made of a wide variety of materials.