Circuit control unit by recognizing mounting of shielding case



PROBLEM TO BE SOLVED: To prevent deterioration of radiation characteristics of an unnecessary electromagnetic wave and non-performance of external noise countermeasure, and to prevent a shielding case from being intentionally removed and a content of an electronic circuit of an object of shielding from unnecessarily being analyzed and modified. SOLUTION: In a circuit control unit, a power supply 8 for operation voltage supply is connected to the power terminal of the electronic circuit 2 of object of shielding through a switching element 9. A pattern land 7 for shielding case soldering is divided, and one division pattern land 7a is connected to ground G. The other division pattern land 7b is connected to a control electrode 9a of the switching element 9. An opening of the shielding case 6 is solder-bonded between the division pattern lands 7a and 7b. Ground potential generated in the other division pattern land 7b is set to be control potential for on-operation in the switching element 9, and is set in the control electrode 9a. COPYRIGHT: (C)2007,JPO&INPIT
【課題】不要電磁波の輻射特性劣化や外来ノイズ対策の未実施を防止し、また故意にシールドケースが外されて被シールド対象電子回路の中身の解析や改造を不要に受けるのを回避する。 【解決手段】動作電圧供給用の電源8をスイッチング素子9を介して被シールド対象電子回路2の電源端子に接続するとともにシールドケース半田付け用のパターンランド7を分割し、一分割パターンランド7aはアースGに接続し、他分割パターンランド7bはスイッチング素子9の制御電極9aに接続し、各分割パターンランド7a,7b間にシールドケース6の開口部が半田付け接合されて他分割パターンランド7bに生じるアース電位を、スイッチング素子9におけるオン動作用の制御電位としてその制御電極9aに設定した。 【選択図】図1




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Cited By (2)

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    EP-2012309-A1January 07, 2009Ricoh Company, Ltd.Optical recording medium
    JP-2012238813-ADecember 06, 2012Nec Corp, 日本電気株式会社Millimeter wave communication device housing structure and shielded state detection method