| 摘要 |
PURPOSE:To improve the laser oscillating efficiency of the title device by constituting the main corona discharge section of the device at two locations so that its preionization can be increased. CONSTITUTION:A dielectric pipe 4 is arranged in the vicinity of one main electrode 2 in the transversal direction and a shield-like electrode 6 is arranged so that the distance between the electrodes 6 and 1 can become longer thant the gap between the electrode 1 and another main electrode 2 Then a relieving section 7 formed to a shape which can relieve an electric field is formed against the main electrode 1. Moreover, the end sections of the pipe 4 and main electrode 2 which are in contact with or close to each other are positioned at a location from which the projecting top of the main electrode 1 can be seen and end sections of the pipe 4 and shield-like electrode 6 which are in contact with or close to each other are positioned at another location from which the projecting top of the main electrode 2 can be seen. Accordingly, corona discharges 11b are produced between the pipe 4 and electrode 2 and corona discharges 11a between the pipe 4 and electrode 6. In addition, the ultraviolet ray irradiating dose to the discharging space is increased, resulting in a further increase in preionization. Therefore, the laser oscillating efficiency of this device is improved. |
