Antenna for non-contact IC card gate facility

• US 5,837,982 A
• Filed: 04/21/1997
• Issued: 11/17/1998
• Est. Priority Date: 11/15/1994
• Status: Expired due to Term

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation), Mitsubishi Electric Semiconductor Software Company Limited
• Inventors: Fujioka, Shuzo
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US08/845,141
• Time in Patent Office: 575 Days
• Field of Search: 235/380, 235/382, 235/375, 235/384, 340/825.31-825.35
• US Class Current: 340/10.2
• 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 7/10079 the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
• CPC Class Codes: G06K 7/10316 using at least one antenna particularly designed for interrogating the wireless record carriers antennas in general H01Q1/22
• CPC Class Codes: G06K 7/10346 the antenna being of the far field type, e.g. HF types or dipoles
• CPC Class Codes: G07C 9/10 Movable barriers with registering means
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence

Abstract

An antenna mechanism for a noncontacting IC card system for communication with a noncontacting IC card passing a gate, the antenna mechanism including an antenna; and a conductive shielding body located on an outer side of the gate to eliminate a communication area outside the gate by shielding electromagnetic waves from the antenna.

Claims

1. An antenna mechanism for a non-contact IC card system for communication with a non-contact IC card passing a gate, said antenna mechanism comprising:

an antenna; and

a conductive shielding body located on an outer side of a gate to eliminate a communication area outside the gate by shielding electromagnetic waves from said antenna, wherein said conductive shielding body comprises a box covering back and side surfaces of said antenna.

2. An antenna mechanism for a non-contact IC card system for communication with a non-contact IC card passing a gate, said antenna mechanism comprising:

an antenna including at least a receiving antenna;

a conductive shielding body located on an outer side of a gate to eliminate a communication area outside the gate by shielding electromagnetic waves from said antenna; and

ground means for connecting said conductive shielding body to a ground having the same electric potential as said receiving antenna.

3. An antenna mechanism for a non-contact IC card system for communication with a non-contact IC card passing a gate, said antenna mechanism comprising:

an antenna for communicating with a non-contact IC card passing a gate;

a conductive shielding body located on an outer side of the gate to eliminate a communication area outside the gate by shielding electromagnetic waves from said antenna; and

an insulating antenna mounting support on which said antenna is mounted.

4. The antenna mechanism of claim 3, wherein said insulating antenna mounting support comprises a wood material.

5. The antenna mechanism of claim 3, wherein said insulating antenna mounting support comprises a plastic material.

6. The antenna mechanism of claim 3, wherein said insulating antenna mounting support comprises a glass material.

7. The antenna mechanism of claim 3, wherein said insulating antenna mounting support comprises a resin material.

8. The antenna mechanism of claim 3, wherein said insulating antenna mounting support comprises first and second insulating members, wherein said conductive shielding body is mounted to said first and second insulating members and said antenna is mounted inside said conductive shielding body.