Abstract: A case for an electronic device includes a frame of metal having an opening, a cover of metal covering the opening, and a circuit board fixedly mounted in the frame and having a hole defined therein. The frame has a portion bent as a shield plate extending through the hole toward an inner surface of the cover. The end portion of the shield plate has a distal end bent as a contact leg held against the inner surface of the cover. The contact leg has a recess, and the circuit board includes a projecting tongue extending into the hole in alignment with the recess and supporting a ground pattern soldered to the shield plate.

Abstract: In an oscillator having a frame, a variable capacitor mounted in the frame and having a rotor and a stator, the rotor having a rotor shaft rotatably supported on the frame, a rotor shaft support mechanism comprises: two sets of rotor shaft support portions provided in the frame, one of the two sets of rotor support portions being formed in the opposing side plates of the frame and being adapted to support the rotor shaft in a transverse direction, and the other one of the rotor shaft support portions being formed in the upper and lower plates of the frame and being adapted to support the rotor shaft in another vertical direction, whereby the rotor shaft can be supported by desiredly selected one of the two sets of rotor support portions.

Abstract: In furnishing an RF modulator with a reference signal generator for generating a specified test signal, and a switching circuit for switching a video signal and the test signal on occasion; the reference signal generator and the switching circuit are received in a shield case of the RF modulator, thereby to prevent radiated interferences.