Noncontacting card, noncontacting-card terminal and noncontacting transmission system

• US 5,436,441 A
• Filed: 10/21/1992
• Issued: 07/25/1995
• Est. Priority Date: 11/07/1991
• Status: Expired due to Fees

• Current Assignee: Snowden Pencer Incorporated (Cardinal Health, Inc.)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Inoue, Takesi
• Primary Examiner(s): SHEPPERD, JOHN W
• Application Number:
  US07/964,262
• Time in Patent Office: 1,007 Days
• Field of Search: 235/449, 235/492, 235/493, 235/450, 235/487, 336/137, 336/147, 336/170, 336/180, 336/232, 336/200, 340/572
• US Class Current: 235/487
• 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: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07781 the coil being fabricated in a winding process
• CPC Class Codes: G06K 19/07783 the coil being planar
• CPC Class Codes: G06K 19/07784 the inductive antenna consisting of a plurality of coils stacked on top of one another
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence

Abstract

A noncontacting card containing a coil circuit has at least two spiral windings connected in parallel for electromagnetically coupling the card to a terminal and a processing circuit connected to the coil circuit for signal processing. A terminal for a noncontacting card including a coil circuit has at least two spiral windings connected in parallel for electromagnetically coupling the terminal to a noncontacting card and a processing circuit connected to the coil circuit for signal processing. A noncontacting transmission system includes a noncontacting card having a coil circuit including at least two spiral windings connected in parallel and a terminal having a coil circuit including at least two spiral winding connected in parallel, the coil circuits of the noncontacting card and the terminal being electromagnetically coupled for transmitting electrical power to the noncontacting card and exchanging data between the terminal and the noncontacting card.

Claims

1. A noncontacting card comprising:

a printed circuit board;

a plurality of spiral windings having respective centers and disposed on opposite sides of said printed circuit board with the centers of two of said spiral windings on opposite sides of said printed circuit board directly opposite each other, spiral windings on opposite sides of said printed circuit board being connected in series as respective coil circuits for electromagnetically coupling the noncontacting card with a terminal;

selection means for selecting a desired number of said coil circuits from among said plurality of coil circuits and connecting the selected coil circuits in parallel; and

a processing circuit connected to said selected coil circuits for signal processing.

2. The noncontacting card as defined in claim 1 wherein said selection means comprises a switch.