Corona-effect sound emitter

• US 4,464,544 A
• Filed: 07/23/1982
• Issued: 08/07/1984
• Est. Priority Date: 04/13/1979
• Status: Expired due to Fees

• Current Assignee: Siegfried Klein
• Original Assignee: Siegfried Klein
• Inventors: Klein, Siegfried
• Primary Examiner(s): Pitts, Harold I.
• Assistant Examiner(s): Byrd, Danita R.
• Application Number:
  US06/401,323
• Time in Patent Office: 746 Days
• Field of Search: 179/113, 179/101, 179/114 R, 336/84 C, 336/DIG. 2, 367/142
• US Class Current: 381/111
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• CPC Class Codes: H05K 9/0022 of components mounted on printed circuit boards [PCB] shields integrated within component packages H01L23/552; shields integrated within PCB H05K1/0218
• CPC Class Codes: Y10S 336/02 Separable

Abstract

A corona effect sound emitter including a discharge electrode producing corona discharge and surrounded by a spherical counter electrode is partially inserted in a housing which encloses a high frequency generator, modulation transformer and a power supply transformer of which the power supply transformer supplies the discharge electrode with electric current. A thin plate of a magnetic metal transversally extends in the housing so that secondary windings of the transformers are positioned above the plate and are separated from the primary windings of the transformers disposed below the plate.

Claims

1. A corona-effect emitter, comprising a metal housing and a thin metal plate closed therewith;

a high frequency oscillator generating in operation disruptive electro-magnetic waves, a modulation transformer, and a power supply transformer mounted on said plate such that said housing with said plate form a first Faraday cage; and

a needle-shaped discharge electrode having a tip and being electrically connected to said high frequency oscillator and producing corona discharge and a counter electrode spaced from the discharge electrode and surrounding the latter, said counter electrode forming a second Faraday cage around said tip, said modulation transformer and said power supply transformer each having a primary winding and a secondary winding, the secondary windings of said power supply transformer and said modulation transformer being respectively positioned inside the first Faraday cage and above said plate, and the primary windings of said power supply transformer and said modulation transformer being respectively positioned outside said first Faraday cage and below said plate so that said metal plate extends between the secondary windings and primary windings of the respective transformers.

2. The emitter as defined in claim 1, wherein said counter electrode is made out of electrically conductive material permeable to sound waves.

3. The emitter as defined in claim 1, wherein said metal plate is a metal foil having a thickness of less than 0.1 mm.

4. The emitter as defined in claim 3, wherein said metal plate is made out of stainless steel.

5. The emitter as defined in claim 1, wherein each of said transformers includes an iron circuit divided into two parts, said parts each bearing the respective winding and being separated by said plate so that said parts face towards each other.

6. The emitter as defined in claim 5, wherein each of said parts has at least two parallel legs which form, respectively, a core and return circuit for the magnetic flux, to free ends of the legs of one of said parts of the iron circuit being in contact with one face of said plate, while the free ends of the legs of the other of said parts are in contact with the opposite face of said plate and in the alignment with the legs of said one part.

7. The emitter as defined in claim 6, wherein said plate is formed with a number of openings equal to the number of legs, each opening having a shape closely matching the profile or the cross section of one of said legs, the legs of one of said parts of the iron circuit passing through said openings and disposed in end-to-end arrangement with the legs of the other part of the iron circuit.

8. The emitter as defined in claim 7, wherein said thin plate is formed with bent collar-like flanges respectively surrounding each of said openings.

9. The emitter as defined in claim 1, further including a metal chassis connected to said housing, said plate forming an upper wall of said chassis, said high frequency oscillator, said modulation transformer and said power supply transformer being rigidly mounted to said chassis.

10. The emitter as defined in claim 9, wherein said plate is formed with at least one rectangular aperture, the emitter further including at least one thin metal foil closing said aperture and separating the secondary winding from the primary winding of the respective transformer.

11. The emitter as defined in claim 1 or 8, wherein said discharge electrode partially surrounded by said counter electrode is mounted on said housing.

12. The emitter as defined in claim 1 or 8, wherein said discharge electrode is partially inserted into said housing.