Abstract: A circuit module includes one or a plurality of semiconductor parts, a substrate having the semiconductor parts mounted thereon, and terminals arranged on an outer periphery of the substrate along a plurality of sides of said substrate. The circuit module is connected to a board of a computer by plugging the terminals into corresponding terminal holes, so that the terminals are used in common for providing electrical connection and mechanical connection with the board of the computer.

Abstract: A printed circuit device comprises a ceramic base plate and a circuit pattern layer which is constituted of electric conductor layers and insulating layers in alternate laminar stacked arrangement on one surface of the base plate, which layers are formed by alternately printing electrically conductive material and insulating material in predetermined patterns and subjecting the material thus printed to baking. Among the electric conductor layers, at least one layer serves as a wiring or conducting layer. At least two electric conductor layers confronting each other with the insulating layer interposed therebetween constitute a capacitor. Resistors are formed in the circuit pattern layer by printing the material of the resistor on an electrode layer applied beforehand to the surface of the electric conductor layer.

Abstract: A push-button type tuning apparatus comprises a frame structure having a pair of opposing support plates provided with support openings, push-buttons each comprised of a button and a slide plate fitted into the support openings in the pair of support plates in a slidable manner, and a resilient restriction member provided on at least one of the support plates and disposed near the slide plates. The restriction member urges the slide plates to press against one edge of the support opening thereby to restrict the positions of the push-buttons at lease when they are pushed, thereby ensuring accurate preset tuning and retuning.

Abstract: A miniature variable capacitor comprises a stator plate group having a plurality of stator plates stationarily held in mutually spaced-apart state with specific spacing therebetween by spacers interposed between mutually adjacent plates, a rotor plate group having a plurality of rotor plates held integrally and rotatably in mutually spaced-apart state with specific spacing therebetween by spacers interposed between mutually adjacent rotor plates, and a thin film of a dielectric material is formed simultaneously and integrally on the entire exposed surface of all plates and spacers of at least one of the stator plate group and the rotor plate group. Furthermore, one or more elastic spacers are provided at plate supporting parts of at least one of the stator and rotor plate groups, and fine powder is distributed over the surfaces of all plates. At the time of production of the variable capacitor the dielectric material is formed in a thin film state on the entire plate group.