A frame construction for a radio telephone or the operating device of a radio telephone. The radio telephone comprises a frame on which printed circuit boards containing telephone electronics are secured on both sides of a substantially flat, electrically conductive frame plate. The frame plate together with ground foils of the printed circuit boards form EMI-shielding for the components located on the sides of the printed circuit boards which face the frame plate. The frame plate preferably has a raised edge to which a printed circuit board is secured. Radio telephone housing parts are located on the two sides of the frame plate to form the radio telephone housing.
A radio-frequency device has a distributor and a tuner. The distributor has an input terminal which is disposed on one side face of a case; an output terminal which is disposed on another side face; and an output terminal which is disposed on the upper side face. The output terminal, and an input terminal of the tuner are respectively protruded at positions which are separated from the bottom face by a substantially same distance. A metal flat plate portion is led out from the side of the distributor and coupled to a receiving portion of the tuner on the side of the input terminal. Therefore, the output terminal of the distributor is directly connected to the input terminal of the tuner, so that a radio-frequency cable for connecting the units to each other is not necessary. A space reduction and a low production cost can be realized.
Disclosed is an ultra-slim telephone set in which a plurality of circuit elements of telephone are mounted on both sides of the PCB in a multi-layer manner so as to reduce the telephone body and the handset is made earphone-typed to be hung in one of ears and can be separated/attached from/to the body with the use of the phone jack so as to make the size of the top side of the telephone be as small as a keypad, so that the telephone set can be hand-held and mobile making the user who especially may have to work with both hands have an improved work environment. The present invention provides the telephone set having an ultra-slim body comprising a first small and double-sided PCB whose structure is configured to have a plurality of telephone circuit elements in a manner of multi-layer, a second small and double-sided PCB in which a plurality of keys for entering telephone numbers as well as for selecting a desired function are mounted, positioned above the first small and double-sided PCB, a case for covering the first and the second PCB as one, of which the plurality of keys are placed on the top side and a connecting means for connecting a handset located at the side of the case and for connecting a telephone line located at the rear side of the case. The present invention further provides a handset comprises a connection means corresponding to the handset connection means, which can be separated/attached from/to the ultra-slim body, and also comprises a microphone and a speaker for respectively input/output of voice signals and amplifiers for respectively the input voice signals and the output voice signals, and both of which are combined as one in a case such that the speaker portion can be attached to one of ears.
Separate electromechanical and electronic modules are detachably electrically interconnected to provide a telecommunication instrument, such as a cellular telephone, which can be mechanically redesigned to a variety of configurations without changing the basic electronic circuits of the instrument. The electronic module is enclosed within a canister providing RF shielding for electrical circuits in the electronic module. If desired, the electromechanical and electronic modules may be enclosed within a disposable cover that conveniently provides recycling of the instrument after a period of limited use.
The present invention provides a cellular phone comprising: a housing having front and rear casings wherein the rear casing comprises a metallic layer coated on an inner side of the rear casing for insulating electromagnetic radiation, a circuit board installed in the housing having a board surface and an antenna connector installed at an upper end of the board surface, an antenna installed at an upper end of the housing and electrically connected with the antenna connector at the upper end of the board surface for receiving or emitting electromagnetic radiation, and an elastic conductor. When the front and rear casings are connected, the elastic conductor is elastically clamped between the board surface of the circuit board and the metallic layer on the inner side of the rear casing so that the metallic layer on the inner side of the rear casing, the upper end of the board surface and the elastic conductor will form an insulating envelope for preventing electromagnetic radiation emitted from the antenna connector from interfering with circuits of the cellular phone which are positioned inside the housing of the cellular phone and outside the insulating envelope.
The present invention relates to a communication station (MT; FIGS. 1, 2; FIGS. 3, 4) including a power supply unit (6, 6', 6"), a core unit (1) connectable to the power supply unit (6, 6', 6") and constituted by a mechanically rigid assembly (9-14, 15-1, 15-2, 16-20) of all other electrical units of the communication station except for the power supply unit, and a shell unit (2-6) which houses the core unit (1) and comprises no electrical units of ther communication station. Front and back housings of the shell unit can be exchanged easily, since no electrical connections are necessary to the core unit during the exchange. Thus, differently shaped communication stations can be easily achieved from a variety of differently shaped housings.
