NOVEL DERIVATIVE OF 1-BENZOYL-2-OXO-5-ALKOXY PYRROLIDINE, MANUFACTURE, USE AS DRUG AND COMPOSITION

摘要

PURPOSE:To prevent the titled reflector from being deteriorated and deformed while maintaining durability thereof by a method wherein cooling water supplying pipe with a nozzle is contained between a laser reflector and a back cover while a sensor detecting displacement of a diaphragm by pressure of cooling water internally circulating is provided. CONSTITUTION:Cooling water supplied from a feed pipe is concentrically jetted to the central part on the backside of a laser reflector 22 to be filled and circulated in a cavity 26 and after cooling the laser reflector 22, a body 20 etc., further forwarded to an external drain 38 through a drain hole 32. The cooling water to be filled and circulated in the cavity 26 is controlled to maintain specified quantity and pressure in the normal status. When the quantity and pressure of said cooling water in the cavity 26 fluctuate above and below the specified values, a diaphragm 34 fixed to a back cover 24 shifts longitudinally for displacement. A sensor 36 such as a switch etc. may detect the shifting for displacement transmitting a signal to turn power supply of laser oscillator main body off stopping laser oscillation.