| 摘要 |
<p>PURPOSE:To obtain an electronic component with a safety function for scarcely decoding a program software and protecting the profit of the software by mounting a SRAM chip or the like in the bottom of the cavity of a circuit board, covering it with a sealer, and connecting the interconnection layer of a power source circuit including a backup battery to the board through a leaf spring. CONSTITUTION:Mounting components such as a microcomputer chip 4 mounted on a circuit board 17, a SRAM chip 3, a random logic IC chip 2, etc., and an electronic component associated with a program software having a power source circuit including the backup battery 14 of the chip 3 are formed in a structure in which the chips 2 to 4 are mounted in the bottom of the cavity 16 of the board 17 of a multilayer structure, so covered with a sealer 7 as not to be visually observed for its interconnecting state, the power source circuit is composed of interconnection layers 21, 25 provided over the front and rear faces of a ceramic board 22, and a ground interconnection layer 23 is superposed on the layer 25 through an insulating film 24 at least on one side face, and the layer 21 is so composed as to be electrically connected to the board 17 through a connecting terminal 20 of a leaf spring.</p> |
