Abstract: A plasma CVD apparatus in which microwave power is supplied into a reaction chamber provided inside an annular waveguide through an antenna provided on the inner peripheral part of the waveguide to produce a plasma inside the reaction chamber and to form a film by a vapor growth synthesizing method. A cooler is disposed between the annular waveguide and the reaction chamber to maintain the low temperature of the annular waveguide.

Abstract: The present invention provides an optical fiber preform-heating furnace that is simple in its structure and excellent in uniformity of the temperature distribution in a circumferential direction of an optical fiber preform. The optical fiber preform-heating furnace includes a furnace core tube into which an optical fiber preform is supplied; a heater that surrounds the furnace core tube; a pair of electrode connection portions with which the heater is provided and has a face opposing to an outer periphery surface of the furnace core tube; and electrode portions that are disposed to each of the electrode connection portions and connected to a power supply. When a cylindrical heat insulator is disposed between the furnace core tube and the opposing faces, since an outward heat transfer amount from the furnace core tube side through the electrode portion can be reduced, the temperature distribution in a circumferential direction of the optical fiber preform can be improved in its uniformity.

Abstract: A plasma CVD apparatus in which microwave power is supplied into a reaction chamber (2) provided inside an annular waveguide (5) through an antenna (20) provided the inner peripheral part of the waveguide (5) so as to produce a plasma inside the reaction chamber (2) and to form a film by a vapor growth synthesizing method. A cooler (27) is disposed between the annular waveguide (5) and the reaction chamber (2) so as to maintain the low temperature of the annular waveguide (5).

Abstract: The present invention provides an optical fiber preform-heating furnace that is simple in its structure and excellent in uniformity of the temperature distribution in a circumferential direction of an optical fiber preform. The optical fiber preform-heating furnace includes a furnace core tube into which an optical fiber preform is supplied; a heater that surrounds the furnace core tube; a pair of electrode connection portions with which the heater is provided and has a face opposing to an outer periphery surface of the furnace core tube; and electrode portions that are disposed to each of the electrode connection portions and connected to a power supply. When a cylindrical heat insulator is disposed between the furnace core tube and the opposing faces, since an outward heat transfer amount from the furnace core tube side through the electrode portion can be reduced, the temperature distribution in a circumferential direction of the optical fiber preform can be improved in its uniformity.

Abstract: An apparatus for treating food under isostatic high pressure applied by a liquid pressure medium which comprises a high-pressure vessel forming therein a treating chamber in which food is placed, a pressure medium tank adjacent to said high-pressure vessel, pipes to deliver a pressure medium from said pressure medium tank to said treating chamber, and a cooling device to hold therein the high-pressure vessel and the pressure medium tank and to cool the high-pressure vessel and the pressure medium tank simultaneously.