Abstract: A mass flowmeter converter detects a Coriolis force acting on a flow tube driven at a constant frequency as a time difference .DELTA.T between two displacement signals detected at symmetrically opposed positions. A mass flow proportional to the time difference .DELTA.T is determined. Sine-wave signals differing in phase and at a constant amplitude are detected paired detecting coils and provide input signals which are pulses having specified pulse width values equal to a leading time (T+.DELTA.T) and a lagging time (T+.DELTA.T). N number of pulses (T+.DELTA.T) and N number of pulses (T-.DELTA.T) are sampled simultaneously by respective integrators having the same time constant, and by using a reference power source a time difference of zero-crossing voltages and a time difference signal enlarged by 2N times is detected. Furthermore, a small time measurement error due to drifts of the charging-discharging circuit is compensated by alternating respective integrators.

Abstract: An improved method of forming a photoresist pattern in the photoengraving process. In the photoengraving process, after forming a photoresist layer, a non-photosensitive organic layer containing cyclized polyisoprene rubber as the major constituent is formed thereover. The organic layer is covered with a mask. The photoresist layer is selectively exposed to light through the organic layer. After developing and removing the organic layer, or together with the organic layer, the photoresist layer is developed.