| 摘要 |
PURPOSE:To remove only a deteriorated dye and use an organic solvent cyclically by a method wherein not only a dye concentration detector is provided to a medium feed circuit for a pigment laser device but also a dye removing filter and a circuit which bypasses the filter, which are connected with each other in parallel, are provided to a circulating circuit. CONSTITUTION:When the detected result of a laser medium which flows through a feed circuit 3 by a dye concentration detector 8 is more than a certain value, a control valve of a bypass circuit 10 is opened, and on-off valves of dye filters 9a and 9b and a control valve of a concentrated dye laser medium tank 15 are closed. Thereby, the laser medium returned from a dye laser device 1 is made to return to a tank 2 through the circuit 10. When the detected result obtained by the detector 8 is less than a certain value, the valve of the circuit 10 is closed and a switch valve 14, an on-off valve of either of the filters 9a and 9b, and the control valve of the tank 15 are opened. By these processes, the laser medium returned from the device 1 is guided to the filters 9a and 9b, the deteriorated dye is caught by the filters 9a and 9b, and the medium is made to return to the tank 2 and a concentrated laser medium is supplied to the tank 2 from the tank 15. |
