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  Compact radio equipment and method of mounting the sameRelated Patent Categories: Electrical Connectors, Having Or Providing Inductive Or Capacitive ShieldThe Patent Description & Claims data below is from USPTO Patent Application 20070059981. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims priority to prior application JP 2003-313493, the disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to a compact radio equipment such as a cell phone or radio communication terminal, and a mounting method thereof. [0003] Conventionally, when electric circuits divided into two or more blocks and mounted on two or more printed circuit boards are mounted in the equipment, a first printed circuit board and a second printed circuit board are electrically connected using one of various kinds of connectors or pin contact systems. A frame is mounted between the first and second printed circuit boards not only to protect the electric circuits on the first printed circuit board, but also position and fix the second printed circuit board (see JP-A-2001-111232). [0004] The conventional frame mentioned above is molded of resin, or made from die cast alloy. The second printed circuit board is secured with screws or engaged with hooks. In case of a resin molded frame, a certain thickness is required in the manufacturing process. The increased thickness of the frame is the cause of preventing the achievement of a small, thin radio equipment design. [0005] The use of screws to secure the second printed circuit board requires an additional step of attaching the screws at manufacturing facilities, and this reduces workability. [0006] On the other hand, the use of hooks to secure the second printed circuit board causes another problem that the hooked portions are susceptible to damage. The die cast alloy is suitable for making the equipment small and thin, but manufacturing costs are high. It may also require an additional step of attaching screws like in the case of resin molding. [0007] Further, the use of a connector or pin contact system to electrically connect the electric circuits on the first printed circuit board and the electric circuits on the second printed circuit board is not enough to supply adequate ground potential. Therefore, a resin molded frame with aluminum deposited on it is used as a conduction material. In other words, metal springs or pins are mounted on the first and second printed circuit boards so that they will electrically contact the aluminum deposited frame. Thus, the supply of the ground potential is enhanced. [0008] However, since aluminum deposition is expensive, the cost of a resin molded frame with aluminum deposited on it becomes high. [0009] Further, since the resin molded frame with aluminum deposited on it is of a contact type, adequate conductivity cannot be obtained. In this case, since not only is the supply of the ground potential inadequate, but the thermal conductivity is also insufficient, heat may be built up in a local place. SUMMARY OF THE INVENTION [0010] It is therefore an object of the present invention to provide compact radio equipment and its mounting method, which can connect two or more printed circuit boards and mount them in the equipment in such an efficient manner that can achieve a small, thin equipment design, improve electrical, mechanical, and heat measures, and enable cost cutting. [0011] According to the invention of a first aspect, a compact radio equipment includes internal circuits on two or more printed circuit boards electrically connected to each other and securely mounted in structure. [0012] With this structure, a first metal shield frame is mounted on a first printed circuit board to cover components mounted on the first printed circuit board. A second printed circuit board is mounted on the first metal shield frame. [0013] Preferably, the second printed circuit board is electrically and mechanically connected to the first metal shield frame so that a bottom surface layer opposite to a component mounting surface is a ground layer. [0014] Preferably, the second printed circuit board is electrically connected to the first metal shield frame so that a bottom surface layer opposite to a component mounting surface is a ground layer, and the second printed circuit board is structured by a radio circuit. [0015] Preferably, a second metal shield frame is provided to cover the second printed circuit board. In this event, the second metal shield frame is mounted on the first metal shield frame. Alternatively, the second shield frame is mounted on the second printed circuit board. [0016] For example, the compact radio equipment serves as a cell-phone or a PHS terminal. [0017] According to the invention of a second aspect, a compact radio equipment includes internal circuits on two or more printed circuit boards electrically connected to each other and securely mounted in structure. [0018] With this structure, a first metal shield frame is mounted on a first printed circuit board to cover first components mounted on the first printed circuit board. A second metal shield frame is mounted on a second printed circuit board to cover second components mounted on the second printed circuit board. In this case, a first top plate of the first metal shield frame and a second top plate of the second metal shield frame are connected to each other. [0019] For example, the compact radio equipment serves as a cell-phone or a PHS terminal. BRIEF DESCRIPTION OF THE DRAWINGS [0020] FIG. 1 is an exploded perspective view of a first embodiment of compact radio equipment to which a mounting method for compact radio equipment according to present invention is applied. [0021] FIG. 2 is a perspective view showing a state in which first electric circuits, a first shield frame, a second printed circuit board, second electric circuits, and a second shield frame, all of which are shown in FIG. 1, are mounted. Continue reading... Full patent description for Compact radio equipment and method of mounting the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Compact radio equipment and method of mounting the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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