| 摘要 |
A low-torque tuning apparatus is provided for use in a magnetron having an electron emitting cathode coaxially disposed within an anode cavity. The tuning apparatus includes a tuner drive capable of reciprocating axial movement relative to the magnetron. The tuner drive has a plate forming a portion of the cavity such that periodic changes in position of the plate by movement of the tuner drive alter a resonant characteristic of the cavity. Axial movement of the tuner drive is guided by a diaphragm at a first portion of the tuner drive and a double bellows at a second portion of the tuner drive. The diaphragm and double bellows have a first spring bias which permits the axial movement while precluding radial movement of the tuner drive and tends to return the tuner drive to a generally null position relative to the magnetron. The double bellows further provides a vacuum seal between the cavity and an atmosphere external to the magnetron. The tuner drive is linked by a leaf spring to an external driving force which inducing the reciprocating axial movement into said tuner drive. The leaf spring has a second spring bias. A total amount of torque required by the external driving force to move the plate is substantially reduced by cancellation of the first and second spring biases over a majority of range of motion of the tuner drive.
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