(12) United States Patent ao) Patent No.: us 6,173,897 Bi
Halpern (45) Date of Patent: *Jan. 16,2001
(54) UNIVERSAL CARD INTERFACE MODULE FOR CONTACT FREE CARDS
(76) Inventor: John W. Halpern, 15 Jordan Court,
Ingram Crescent, West Hove BN3 5NU,
East Sussex (GB)
( * ) Notice: This patent issued on a continued prosecution application filed under 37 CFR 1.53(d), and is subject to the twenty year patent term provisions ol 35 U.S.C. 154(a)(2).
Under 35 U.S.C. 154(b), the term of this patent shall be extended for 0 days.
(21) Appl. No.: 09/122,672
(22) Filed: Jul. 27, 1998
(51) Int. CI.7 G06K 19/06
(52) U.S. CI 235/488; 235/492
(58) Field of Search 235/488, 486,
235/492, 380, 375, 382.5, 382; 340/825.31
(56) References Cited
U.S. PATENT DOCUMENTS
4,795,898 * 1/1989 Berstein et al 235/487
4,835,846 * 6/1989 Juan et al 29/840
4,960,983 * 10/1990 Inoue 235/449
5,434,398 * 7/1995 Goldberg 235/380
5,436,441 * 7/1995 Inoue 235/487
5,444,222 * 8/1995 Inoue 235/380
5,587,574 * 12/1996 Van Geel 235/380
5,594,680 * 1/1997 Ohtake et al 365/63
5,648,761 * 7/1997 Kreft et al 340/825.31
5,670,772 * 9/1997 Goto 235/493
5,675,658 * 10/1997 Brittain 381/72
5,698,838 * 12/1997 Yamaguchi 235/492
5,821,525 * 10/1998 Takebayashi 235/492
5,852,289 * 12/1998 Masahiko 235/492
* cited by examiner
Primary Examiner—Thien M. Le
(74) Attorney, Agent, or Firm—Rothwell, Figg, Ernst & Manbeck
Card and Card Reader contain a broadly m-shaped or twin looped antenna consisting of one or more thin conducting layers between plastic laminates wherein the middle branch 18 oscillates in anti-phase with the two outer branches 16 and 17 for proximity coupling applications, whereas all the said three branches oscillate in phase in distant read/write applications.
The prevailingly capacitive positions 15, 13, 14 of the antenna can be utilised for card readers where it is preferred to draw a card through a slot into the interior of a sensor unit where the card may be tested, processed, or if need be, withdrawn. Capacitive transfer may be also useful in cases where the temporary clipping of the card to a piece of equipment will unite its data base to a digital system. The instructive component can best be utilized in informal proximity presentations of the card to a Reader area; and its electromagnetic manifestation can best be used in card identifications a distance of several meters.
In order to avoid in proximity transactions a change of transfer efficiency due to subtle alterations in antenna attitudes relative to each other, or in the spacing from each other, or in other modifications of the environment affecting the radiation resistance of the antennas of the said units, this patent application also describes means for allowing the primary frequency of the oscillator source to fluctuate, and to be self-adapting to said random conditions.
13 Claims, 15 Drawing Sheets