Wireless access control system using a proximity member and antenna equipment therefor

• US 5,808,587 A
• Filed: 03/21/1997
• Issued: 09/15/1998
• Est. Priority Date: 03/24/1994
• Status: Expired due to Term

• Current Assignee: Hochiki Corporation
• Original Assignee: Hochiki Corporation
• Inventors: Shima, Hiroshi
• Primary Examiner(s): Hajec, Donald T.
• Assistant Examiner(s): PHAN, THO GIA
• Application Number:
  US08/823,011
• Time in Patent Office: 543 Days
• Field of Search: 343/700 MS, 343/895
• US Class Current: 343/895
• CPC Class Codes: G07C 9/27 with central registration
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence
• CPC Class Codes: H01Q 1/3233 particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

The present invention provides an antenna equipment for a wireless access control system, which includes a plurality of print substrates which are stacked in a unitary assembly; and a plurality of coil patterns each of which has a starting end and a terminating end, the patterns being respectively formed on the plurality of print substrates; wherein each of the plurality of coil patterns are connected each other at at least one of the starting end and the terminating end thereof.

Claims

1. A wireless access control system using a proximity member comprising:

a controlled body which is controlled by said control system;

a remote control unit for controlling said control system;

a proximity member comprising memory means for storing ID information therein, first transmitting/receiving means for receiving a signal having a predetermined frequency and transmitting a signal based on said ID information stored in said memory means in response to said signal having the predetermined frequency; and

first power supply means for creating an operation power of said proximity member by receiving said signal having the predetermined frequency to supply said operation power to said proximity member;

a reading/writing unit comprising second transmitting/receiving means for transmitting said signal having the predetermined frequency and receiving said signal based on said ID information transmitted from said proximity member, said transmitting/receiving means including an antenna having a plurality of printed-circuit substrates which are stacked in a unitary assembly, and a plurality of coil patterns each of which has a starting end and a terminating end, said patterns being respectively formed on said plurality of printed-circuit substrates, wherein a starting end and a terminating end of at least one of said plurality of coil patterns are connected to a starting end and terminating end, respectively, of at least one other of said plurality of coil patterns;

second power supply means for supplying a power to said antenna so that said antenna generates an inductive electromagnetic field which is the signal having the predetermined frequency;

control means for controlling said controlled body based on said ID information received by said second transmitting/receiving means; and

transmission means for transmitting an operation condition of said reading/writing unit to said remote control unit; and

a transmission path which connects said remote control unit and said reading/writing unit;

wherein said proximity member picks up said signal having the predetermined frequency to acquire said operation power when said proximity member enters an communication area of said reading/writing unit.

2. A control system as claimed in claim 1, wherein at least one of said plurality of coil patterns is a spiral having a plurality of turns.

3. A control system as claimed in claim 2, wherein at least two of said plurality of coil patterns are spirals having a plurality of turns and similar shapes.

4. A control system as claimed in claim 1, wherein each of said plurality of coil patterns has a length of substantially one turn, and wherein a starting end of at least one of said plurality of coil patterns is connected to a terminating end of at least one other of said plurality of coil patterns.

5. A control system as claimed in claim 4, wherein adjacent coil patterns are connected to each other to form a spiral in the stacking direction of said plurality of printed-circuit substrates.

6. A control system as claimed in claim 4, wherein the length of each of said plurality of coil patterns is more than one turn but less than two turns.

7. A control system as claimed in claim 4, wherein each of said plurality of coil patterns has a coil width greater than or equal to 2 mm.

8. A control system as claimed in claim 4, further comprising a plurality of said reading/writing unit.