The rear of a thin IC card is provided with a jack (42A, 42B, FIG. 4) that can receive a multi-contact audio type plug (40) having a diameter that is more than half the thickness of the card. The circuit board has a slot (60) that opens into the rear of the card. A U-shaped insulative block (80)...http://www.google.com.tw/patents/US5823796?utm_source=gb-gplus-share專利 US5823796 - Audio/power jack for IC card
