Abstract: An angular velocity sensor driving circuit includes a driving part for a vibrator, a vibration level detector, a coriolis force detector, a first amplifier for amplifying an output signal of the vibration level detector, a rectifying circuit, a variable gain amplifier, a voltage amplifier, a level judging circuit and switching means. The gain of the voltage amplifier or the gain of a variable gain amplifier is varied by a switching circuit which is controlled by the output signal of a level judging circuit which compares the output signal of the rectifying circuit and a reference voltage. By using the switching circuit rapid start up of the angular velocity sensor can be achieved.

Abstract: A thermal transfer recording system using a thermal head is disclosed. The thermal head includes protective films with different levels of thermal conductivity so that heat can be selectively and preferentially conducted to the protective film located right above the heat resistor layer, resulting in improved thermal efficiency and reduced power consumption. Because the thermal head is of an endface type, the tip of the thermal head can sufficiently protrude, which increases the stress to be applied by the thermal head onto a sheet of printing paper. This enables printing on a rough sheet. The sufficient protrusion of the tip also ensures an appropriate angle of an ink ribbon with respect to the sheet when the ink ribbon is applied to and removed from the sheet. Thus, bi-directional printing can be performed, resulting in high speed printing.