Electromagnetic induction coil antenna

• US 4,489,330 A
• Filed: 09/22/1982
• Issued: 12/18/1984
• Est. Priority Date: 10/01/1981
• Status: Expired due to Fees

• Current Assignee: Rion Kabushiki Kaisha
• Original Assignee: Rion Kabushiki Kaisha
• Inventors: Fukutome, Tatsuro, Marutake, Yozo, Asami, Motomu, Motohashi, Hideo
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US06/421,660
• Time in Patent Office: 818 Days
• Field of Search: 343/705, 343/718, 343/742, 179/82, 179/107 R, 381/68
• US Class Current: 343/742
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04R 2225/51 Aspects of antennas or their circuitry in or for hearing aids
• CPC Class Codes: H04R 25/554 using a wireless connection, e.g. between microphone and amplifier or using Tcoils

Abstract

The invention relates to an electromagnetic induction coil or antenna device embedded in hearing aids or radio sets for receiving sound signals or carrier signals generated by a primary electromagnetic induction coil which is laid down in the room. A plurality of coils each one end of which is commonly connected and each other end of which extends outwardly from the one end so as to be uniformly arranged in a space and a phase selector connected to the coils operates, as a mercury switch, to pick up positive phase component output signals which are induced in at least any of the coils. The coils and the phase selector are fixedly built in the body of a hearing aid, etc. so that the corresponding coil and conduit in which a suitable quantity of mercury is charged may be paralleled to each other and so on, thereby to obtain a constant output sound pressure irrespective of the posture of a person wearing a hearing aid or enjoying television.

Claims

1. An electromagnetic induction coil device for cooperating with a primary induction coil system, comprising:

an electromagnetic coil assembly including four coils each having a first end connected to the first end of each of the four coils at a center junction and a second end, each coil having the same winding direction and extending outwardly from said center junction along the lines from the center of a regular tetrahedron to each of the four apexes thereof to be uniformly spatially arranged;

a phase selector including a regular tetrahedron shaped insulating block having four conduits cut therethrough along the lines from the center junction of the regular tetrahedron thereof to the four apexes thereof;

a quantity of electrically conductive liquid within said conduits;

four insulating covers sealing the ends of said conduits, each cover having two terminals therethrough to cause such terminals to be shorted together by contact with the electrically conductive liquid when such terminals are below said insulating block center junction, said conduits being positioned so that each conduit thereof extends in parallel with a corresponding coil of said coil assembly;

means connecting the ends of each coil to the terminals of the correspondingly extending one of said conduits; and

a pair of output terminals connected across the coil assembly for providing as an output signal positive phase component output signals induced in at least one of said coils.

2. An electromagnetic induction coil device for cooperating with a primary induction coil system, comprising:

an electromagnetic coil assembly including at least two coils connected in parallel and having, as their own axes, at least two axes of rectangular coordinates;

a phase selector including a conductive block having at least two conduits cut therethrough, each conduit having the direction of a respective rectangular coordinate;

a quantity of electrically conductive liquid within said conduits;

a pair of insulating covers for each conduit, one insulating cover sealing each end of each of said conduits, each insulating cover having a terminal therethrough to cause such terminal to contact the electrically conductive liquid when such terminal is below the other terminal of that conduit, each of said conduits being positioned to extend in parallel with a corresponding coil of said coil assembly;

a phase selecting circuit for picking up coil output signals of different phase from each other induced in said coils and coupling such signals to said phase selector terminals for switching such signals in accordance with variation of position of said coils; and

output means connected to said phase selector for providing as a device output signal the summed switched coil output signals.

4. An electromagnetic induction coil device as claimed in claim 2 wherein said assembly includes three coils extending along three axes of a rectangular coordinate and said phase selector includes a conductive block which has three conduits corresponding to said coils.

3. An electromagnetic induction coil device for cooperating with a primary induction coil system, comprising:

a phase selector including a regular tetrahedron shaped conductive block having four conduits cut therethrough from the four apexes thereof, through the center thereof to the opposite planes thereof, such conduits intersecting each other at a center junction at the tetrahedron center;

a quantity of electrically conductive liquid within said conduits;

a pair of insulating covers for each conduit, one insulating cover sealing each end of each of said conduits, each insulating cover having a terminal therethrough to cause such terminal to contact the electrically conductive liquid when such terminal is below the other terminal of that conduit;

an electromagnetic coil assembly including four coils, each coil extending in parallel with a corresponding one of said conduits;

four phase selecting circuits, one phase selecting circuit coupling the each of said coils to the terminals of the corresponding one of said conduits; and

output means connected to said phase selector for providing as a device output signal the summed signals of said coils.