Abstract: Yoke joints of a magnetron for generating microwaves include joining lugs having holes protruding out from the upper edges of each end of a plane part of a lower yoke and catches provided in an upper yoke to join with the above joining lugs. The upper and lower yokes are joined by means of above joining lugs provided in the lower yoke and catches provided in the upper yoke and the magnetron is connected to an electronic range by means of the above joining lugs.

Abstract: This invention relates to a magnetron with a device for coupling an antenna feeder to an evacuation tube. The coupling device comprises a male engaging member formed at an upper end of the antenna feeder and a female engaging member formed at a lower end of the evacuation tube and adapted to fittably receive the male engaging member. The female engaging member comprises a hollow boss and a pair of slits formed at the hollow boss. The coupling device couples the antenna feeder to the evacuation tube before the evacuation tube is tipped off and enables the antenna feeder to be maintained at its initial set position.

Abstract: Cooling device of a magnetron for a microwave oven, which includes a plurality of radiation fins disposed between an outer periphery of an anode cylinder and an inner surface of a yoke serving as a frame for radiating heat of a high temperature produced during osicillating operation of the magnetron for generating an electromagnetic wave. The temperature of the fins disposed centrally in substantially the same as the temperature of the fins disposed at both ends of the anode cylinder. This is accomplished by, the fins disposed centrally on the outer peripherey being arranged at a diffeent distance from the distance between the fins disposed on both ends of the anode cylinder or by the fins disposed centrally being made of different materials from the materials of the end.

Abstract: An electric power generator comprises several permanent magnet disks including several permanent magnets and several coil disks located between the permanent magnet disks and including several coils, and a line connection circuit for connecting output lines of the coils in parallel.