Abstract: A Q-switch laser device for outputting a pulse laser from an optical resonator is equipped with a Q-switch for changing high/low values of a Q-value for the resonator; a switch-pulse generation means for generating a switch pulse with a frequency for determining a repetition period of the pulse laser; an RF oscillation means for generating an RF signal with a frequency higher than that of the switch pulse; a pulse synchronization means for inputting the switch pulse and RF signal and outputting a phase-synchronization pulse, where arising timing of the former is synchronized with a phase of the latter; and an RF modulation means for inputting the phase-synchronization pulse and outputting the RF signal as an RF modulation signal of the RF signal made ON/OFF, corresponding to a period of L/H-levels of an input pulse, wherein the Q-switch changes the Q-value of the resonator to the high/low values.

Abstract: A Q-switch laser device for outputting a pulse laser from an optical resonator is equipped with a Q-switch for changing high/low values of a Q-value for the resonator; a switch-pulse generation means for generating a switch pulse with a frequency for determining a repetition period of the pulse laser; an RF oscillation means for generating an RF signal with a frequency higher than that of the switch pulse; a pulse synchronization means for inputting the switch pulse and RF signal and outputting a phase-synchronization pulse, where arising timing of the former is synchronized with a phase of the latter; and an RF modulation means for inputting the phase-synchronization pulse and outputting the RF signal as an RF modulation signal of the RF signal made ON/OFF, corresponding to a period of L/H-levels of an input pulse, wherein the Q-switch changes the Q-value of the resonator to the high/low values.

Abstract: A current drive device control circuit for controlling drive currents that flow in a plurality of current drive devices serially connected to a constant current power source is characterized by comprising a plurality of bypass circuits parallely connected to each of the plurality of the current drive devices, wherein each of the plurality of the bypass circuits controls a bypass current flowing in own circuit thereof and the drive currents of the current drive devices corresponding to the bypass circuits whose bypass currents are controlled.

Abstract: A CRO comprising a scan converter storage tube for storing the input waveform, and a CRT for displaying the input waveform received either directly from the signal input of the instrument or via the storage tube. As the center-to-center distance between the vertical and horizontal deflection plates of the storage tube unavoidably differs from the center-to-center distance between the vertical and horizontal deflection plates of the CRT, the input waveform is displayed in horizontally different positions on the CRT screen depending upon whether it is fed directly from the signal input or has been stored in the storage tube. In order to minimize this horizontal positional difference a position corrector circuit is provided which puts out a correction signal in proportion with a horizontal sweep speed determined by a sweep speed selector switch built into a sweep generator in a horizontal deflection circuit.