Circuit chip mounted card and circuit chip module

• US 6,422,473 B1
• Filed: 06/22/1999
• Issued: 07/23/2002
• Est. Priority Date: 12/27/1996
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Ikefuji, Yoshihiro, Okada, Hiroharu, Chimura, Shigemi
• Primary Examiner(s): Lee, Michael G.
• Assistant Examiner(s): Lee, Diane I.
• Application Number:
  US09/331,176
• Publication Number:
  US 20020070280A1
• Time in Patent Office: 1,127 Days
• Field of Search: 235/492, 235/375, 235/441, 235/451, 361/737
• US Class Current: 235/492
• CPC Class Codes: G06K 19/072 the record carrier comprising a plurality of integrated circuit chips
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/0726 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
• CPC Class Codes: G06K 19/07745 Mounting details of integrated circuit chips
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

Oppositely arranged bumps (82,84) are electrically connected by connecting two IC chips (76,78) through an anisotropic conductor (80) to form an IC chip module (74). With IC chip module (74) having such structure, two IC chips (76,78) provided with functions of a processing portion and an antenna are simply stacked to provide a function for communication, and arrangement of interconnection outside IC chip (76,78) is not necessary. Thus, accidental breakage of the interconnection is avoided and assembly is extremely facilitated. Therefore, a circuit chip mounted card with higher reliability and reduced manufacturing cost and the like can be provided.

Claims

1. A circuit chip module forming a card with a circuit including an antenna for communication utilizing an electromagnetic wave and a processing portion performing a process for communication, comprising:

a first circuit chip including at least a portion of the processing portion and having a first terminal; and

a second circuit chip including the antenna and a remaining portion of the processing portion and having a second terminal, and characterized in that said first circuit chip and said second circuit chip are stacked in a direction of thickness of the card to electrically connect said first terminal with said second terminal, wherein said first circuit chip and said second circuit chip as stacked are free from external electrical connections in regions outside thereof, and further characterized in that a desired resonance frequency is obtained by selectively disconnecting an interconnection for a plurality of capacitors preliminary provided in said first and second circuit chips.

2. A circuit chip module forming a card with a circuit including an antenna for communication utilizing an electromagnetic wave and a processing portion performing a process for communication, comprising:

a first circuit chip including at least a portion of the processing portion and having a first terminal; and

a second circuit chip including the antenna and a remaining portion of the processing portion and having a second terminal, and characterized in that said first circuit chip and said second circuit chip are stacked in a direction of thickness of the card to electrically connect said first terminal with said second terminal, wherein said first circuit chip and said second circuit chip as stacked are free from external electrical connections in regions outside thereof, further characterized in that a resonance frequency of a resonance circuit including a capacitor and a coil of the antenna provided in said first and second circuit chips can be adjusted, and that a desired resonance frequency is obtained by selectively disconnecting an interconnection for a plurality of coils preliminary provided in said first and second circuit chips.

3. A composition of circuit chips including a first chip and a second chip in a stack, characterized in that

at least two first electrodes are provided for said first chip on a side of said second chip, and at least two second electrodes are provided for said second chip on a side of said first chip, wherein

said at least two first electrodes are electrically connected with each other by a detour interconnection, and said first and second chips are stacked to electrically connect said at least two first electrodes with said at least two second electrodes respectively so that said at least two second electrodes are electrically connected with each other through said detour interconnection.

4. A circuit chip mounted card provided with a circuit chip module including a composition of a first circuit chip and a second circuit chip in a stack, wherein said circuit chip module is characterized in that

at least two first terminals are provided for said first circuit chip on a side of said second circuit chip, and at least two second terminals are provided for said second circuit chip on a side of said first circuit chip, wherein

said at least two first terminals are electrically connected with each other by a detour interconnection, and said first circuit chip and said second circuit chip are stacked to electrically connect said at least two first terminals with said at least two second terminals respectively so that said at least two second terminals are electrically connected with each other through said detour interconnection.